CVE-2019-11043: Underflow in PHP-FPM can lead to RCE
Noroxi assessment
Priority: Now (action score 99/100)
- CISA has confirmed exploitation in the wild (Mar 25, 2022); it is known to be used in ransomware campaigns. Remediation deadline for US federal agencies: Apr 15, 2022.
- A ready-made attack module is public (Metasploit, Nuclei); exploiting it takes no special expertise.
- Probability of exploitation in the next 30 days: 99.7% (FIRST EPSS); higher than 99.9% of all records.
- Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
- Fixed version: apcu-panel (AlmaLinux:8) 5.1.12-2.module_el8.3.0+2010+7c76a223, 5.1.17-1.module_el8.3.0+2009+b272fdef; libzip (AlmaLinux:8) 1.5.2-1.module_el8.3.0+2009+b272fdef, 1.5.1-2.module_el8.5.0+53+9945c2af, 1.5.1-2.module_el8.3.0+2010+7c76a223; libzip-devel (AlmaLinux:8) 1.5.2-1.module_el8.3.0+2009+b272fdef, 1.5.1-2.module_el8.4.0+2228+7c76a223, 1.5.2-1.module_el8.4.0+2229+b272fdef.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Patch today or shut off access. Upgrade to apcu-panel (AlmaLinux:8) 5.1.12-2.module_el8.3.0+2010+7c76a223, 5.1.17-1.module_el8.3.0+2009+b272fdef; libzip (AlmaLinux:8) 1.5.2-1.module_el8.3.0+2009+b272fdef, 1.5.1-2.module_el8.5.0+53+9945c2af, 1.5.1-2.module_el8.3.0+2010+7c76a223; libzip-devel (AlmaLinux:8) 1.5.2-1.module_el8.3.0+2009+b272fdef, 1.5.1-2.module_el8.4.0+2228+7c76a223, 1.5.2-1.module_el8.4.0+2229+b272fdef or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · CISA KEV · FIRST EPSS
In PHP versions 7.1.x below 7.1.33, 7.2.x below 7.2.24 and 7.3.x below 7.3.11 in certain configurations of FPM setup it is possible to cause FPM module to write past allocated buffers into the space reserved for FCGI protocol data, thus opening the possibility of remote code execution.
- BDU:2020-00013
- ALSA-2019:3735
- ALSA-2019:3736
- DLA-1970-1
- DSA-4552-1
- DSA-4553-1
- openSUSE-SU-2019:2441-1
- openSUSE-SU-2019:2457-1
- RHSA-2019:3286
- RHSA-2019:3287
- RHSA-2019:3299
- RHSA-2019:3300
- RHSA-2019:3724
- RHSA-2019:3735
- RHSA-2019:3736
- RHSA-2020:0322
- RHSA-2020:2835
- RLSA-2019:3735
- RLSA-2019:3736
- SUSE-SU-2019:2809-1
- Published
- Oct 28, 2019
- Updated
- Jun 16, 2026
- EPSS
- 99.7% · 99th percentile
- CWE
- CWE-120
Report tools
Action score
99
Now
Patch today or shut off access.
- CVSS
- 39 / 40 · 9.8 / 10
- CISA KEV
- 30 / 30 · Listed
- EPSS
- 30 / 30 · 99.7%
CISA SSVC decision
- Exploitation
- active
- Automatable
- no
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 9.8
- CNA · php
- 8.7
- 1.1 point gap
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Actively exploited in the wild
CISA added this to its Known Exploited Vulnerabilities catalog on Mar 25, 2022. That signals real attacks, not theory.
Remediation deadline for US federal agencies: Apr 15, 2022.
Known to be used in ransomware campaigns.
Get told when this record changes
- In CISA KEV: exploitation in the wild confirmed
- Weaponized exploit exists
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| php | php | cpe:2.3:a:php:php |
| canonical | ubuntu linux | cpe:2.3:o:canonical:ubuntu_linux |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
| fedoraproject | fedora | cpe:2.3:o:fedoraproject:fedora |
| tenable | tenable.sc | cpe:2.3:a:tenable:tenable.sc |
| redhat | software collections | cpe:2.3:a:redhat:software_collections |
| redhat | enterprise linux | cpe:2.3:o:redhat:enterprise_linux |
| redhat | enterprise linux desktop | cpe:2.3:o:redhat:enterprise_linux_desktop |
| redhat | enterprise linux eus | cpe:2.3:o:redhat:enterprise_linux_eus |
| redhat | enterprise linux eus compute node | cpe:2.3:o:redhat:enterprise_linux_eus_compute_node |
| redhat | enterprise linux for arm 64 | cpe:2.3:o:redhat:enterprise_linux_for_arm_64 |
| redhat | enterprise linux for arm 64 eus | cpe:2.3:o:redhat:enterprise_linux_for_arm_64_eus |
and 11 more
Using php? Add it to your stack and be the first to know about CVEs like this one. (PHP)
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- php php7.1.0 and later · before 7.1.33
- php php7.2.0 and later · before 7.2.24
- php php7.3.0 and later · before 7.3.11
Versions reported by the vendor
Affected version ranges reported by the assigning authority (php). Independent of NVD's CPE analysis and usually ahead of it.
PHP PHP
- 7.1.x and later · before 7.1.33affected
- 7.2.x and later · before 7.2.24affected
- 7.3.x and later · before 7.3.11affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | apcu-panel | before 5.1.12-2.module_el8.3.0+2010+7c76a223 | 5.1.12-2.module_el8.3.0+2010+7c76a223 |
| AlmaLinux:8 | apcu-panel | before 5.1.17-1.module_el8.3.0+2009+b272fdef | 5.1.17-1.module_el8.3.0+2009+b272fdef |
| AlmaLinux:8 | libzip | before 1.5.2-1.module_el8.3.0+2009+b272fdef | 1.5.2-1.module_el8.3.0+2009+b272fdef |
| AlmaLinux:8 | libzip | before 1.5.1-2.module_el8.5.0+53+9945c2af | 1.5.1-2.module_el8.5.0+53+9945c2af |
| AlmaLinux:8 | libzip | before 1.5.1-2.module_el8.3.0+2010+7c76a223 | 1.5.1-2.module_el8.3.0+2010+7c76a223 |
| AlmaLinux:8 | libzip | before 1.5.1-2.module_el8.4.0+2228+7c76a223 | 1.5.1-2.module_el8.4.0+2228+7c76a223 |
| AlmaLinux:8 | libzip | before 1.5.2-1.module_el8.4.0+2229+b272fdef | 1.5.2-1.module_el8.4.0+2229+b272fdef |
| AlmaLinux:8 | libzip | before 1.5.2-1.module_el8.5.0+152+112d3b8c | 1.5.2-1.module_el8.5.0+152+112d3b8c |
| AlmaLinux:8 | libzip-devel | before 1.5.2-1.module_el8.3.0+2009+b272fdef | 1.5.2-1.module_el8.3.0+2009+b272fdef |
| AlmaLinux:8 | libzip-devel | before 1.5.1-2.module_el8.4.0+2228+7c76a223 | 1.5.1-2.module_el8.4.0+2228+7c76a223 |
| AlmaLinux:8 | libzip-devel | before 1.5.2-1.module_el8.4.0+2229+b272fdef | 1.5.2-1.module_el8.4.0+2229+b272fdef |
| AlmaLinux:8 | libzip-devel | before 1.5.1-2.module_el8.3.0+2010+7c76a223 | 1.5.1-2.module_el8.3.0+2010+7c76a223 |
| AlmaLinux:8 | libzip-devel | before 1.5.1-2.module_el8.5.0+53+9945c2af | 1.5.1-2.module_el8.5.0+53+9945c2af |
| AlmaLinux:8 | libzip-devel | before 1.5.2-1.module_el8.5.0+152+112d3b8c | 1.5.2-1.module_el8.5.0+152+112d3b8c |
| AlmaLinux:8 | libzip-tools | before 1.5.1-2.module_el8.3.0+2010+7c76a223 | 1.5.1-2.module_el8.3.0+2010+7c76a223 |
| AlmaLinux:8 | libzip-tools | before 1.5.2-1.module_el8.4.0+2229+b272fdef | 1.5.2-1.module_el8.4.0+2229+b272fdef |
| AlmaLinux:8 | libzip-tools | before 1.5.1-2.module_el8.4.0+2228+7c76a223 | 1.5.1-2.module_el8.4.0+2228+7c76a223 |
| AlmaLinux:8 | libzip-tools | before 1.5.2-1.module_el8.3.0+2009+b272fdef | 1.5.2-1.module_el8.3.0+2009+b272fdef |
| AlmaLinux:8 | libzip-tools | before 1.5.1-2.module_el8.5.0+53+9945c2af | 1.5.1-2.module_el8.5.0+53+9945c2af |
| AlmaLinux:8 | libzip-tools | before 1.5.2-1.module_el8.5.0+152+112d3b8c | 1.5.2-1.module_el8.5.0+152+112d3b8c |
| AlmaLinux:8 | php-pear | before 1:1.10.9-1.module_el8.3.0+2009+b272fdef | 1:1.10.9-1.module_el8.3.0+2009+b272fdef |
| AlmaLinux:8 | php-pear | before 1:1.10.5-9.module_el8.3.0+2010+7c76a223 | 1:1.10.5-9.module_el8.3.0+2010+7c76a223 |
| AlmaLinux:8 | php-pecl-apcu | before 5.1.17-1.module_el8.3.0+2009+b272fdef | 5.1.17-1.module_el8.3.0+2009+b272fdef |
| AlmaLinux:8 | php-pecl-apcu | before 5.1.17-1.module_el8.5.0+152+112d3b8c | 5.1.17-1.module_el8.5.0+152+112d3b8c |
+96
Same product
php: all recordsOther highest-scoring records for the same primary product.
- CVE-2024-4577Argument Injection in PHP-CGIKEV99Now
- CVE-2012-1823sapi/cgi/cgi_main.c in PHP before 5.3.12 and 5.4.x before 5.4.2, when configured as a CGI script (aka php-cgi), does not properly handle queKEV99Now
- CVE-2026-109619RCE via stale global stateKEV96Now
Published before and after this one in the same product
- ← EarlierCVE-2019-11041Aug 9, 2019 · heap-buffer-overflow on exif_scan_thumbnail in EXIF extension29Monitor
- ← EarlierCVE-2019-11042Aug 9, 2019 · heap-buffer-overflow on exif_process_user_comment in EXIF extension29Monitor
- Later →CVE-2010-4657Nov 13, 2019 · PHP5 before 5.4.4 allows passing invalid utf-8 strings via the xmlTextWriterWriteAttribute, which are then misparsed by libxml2.30Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| almalinux:apcu-panel | 5.1.12-2.module_el8.3.0+2010+7c76a223 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:libzip | 1.5.1-2.module_el8.3.0+2010+7c76a223 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:libzip-devel | 1.5.1-2.module_el8.4.0+2228+7c76a223 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:libzip-tools | 1.5.1-2.module_el8.4.0+2228+7c76a223 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:php-pear | 1:1.10.5-9.module_el8.3.0+2010+7c76a223 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:php-pecl-apcu | 5.1.12-2.module_el8.5.0+53+9945c2af · AlmaLinux:8 | Package registry (OSV) |
| almalinux:php-pecl-apcu-devel | 5.1.12-2.module_el8.5.0+53+9945c2af · AlmaLinux:8 | Package registry (OSV) |
| almalinux:php-pecl-zip | 1.15.3-1.module_el8.5.0+53+9945c2af · AlmaLinux:8 | Package registry (OSV) |
| alpine:php7 | 7.3.11-r0 · Alpine:v3.10 | Package registry (OSV) |
| debian:php5 | 5.6.40+dfsg-0+deb8u7 · Debian:8 | Package registry (OSV) |
| debian:php7.0 | 7.0.33-0+deb9u6 · Debian:9 | Package registry (OSV) |
| debian:php7.3 | 7.3.11-1~deb10u1 · Debian:10 | Package registry (OSV) |
| opensuse:php7 | 7.2.34-150000.4.103.1 · openSUSE:Leap 15.4 | Package registry (OSV) |
| opensuse:php7-test | 7.2.5-lp151.6.13.1 · openSUSE:Leap 15.1 | Package registry (OSV) |
| red hat:php | 0:5.4.16-46.1.el7_7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:php-bcmath | 0:5.4.16-46.1.el7_7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:php-cli | 0:5.4.16-46.1.el7_7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:php-common | 0:5.4.16-46.1.el7_7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:php-dba | 0:5.4.16-46.1.el7_7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:php-debuginfo | 0:5.4.16-46.1.el7_7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:php-devel | 0:5.4.16-46.1.el7_7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:php-embedded | 0:5.4.16-46.1.el7_7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:php-enchant | 0:5.4.16-46.1.el7_7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:php-fpm | 0:5.4.16-46.1.el7_7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:php-gd | 0:5.4.16-46.1.el7_7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:php-intl | 0:5.4.16-46.1.el7_7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| rocky linux:libzip | 0:1.5.1-2.module+el8.4.0+413+c9202dda · Rocky Linux:8 | Package registry (OSV) |
| rocky linux:php-pear | 1:1.10.5-9.module+el8.4.0+413+c9202dda · Rocky Linux:8 | Package registry (OSV) |
| rocky linux:php-pecl-apcu | 0:5.1.12-2.module+el8.4.0+413+c9202dda · Rocky Linux:8 | Package registry (OSV) |
| rocky linux:php-pecl-zip | 0:1.15.3-1.module+el8.4.0+413+c9202dda · Rocky Linux:8 | Package registry (OSV) |
+4
Exploit status
Weaponized
A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.
Evidence
- Metasploit module ×1
- Exploit-DB entry ×2
- Nuclei detection template ×1
- Proof-of-concept repository on GitHub ×29
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Metasploit module | exploit/multi/http/php_fpm_rcePHP-FPM Underflow RCEexploit | 2019-10-22 |
| Nuclei detection template | Nuclei template CVE-2019-11043 | — |
| Proof-of-concept repository on GitHub | stars:1837 | 2019-09-23 |
| Proof-of-concept repository on GitHub | stars:0 | 2019-10-23 |
| Proof-of-concept repository on GitHub | stars:0 | 2019-10-23 |
| Proof-of-concept repository on GitHub | stars:105 | 2019-10-23 |
| Proof-of-concept repository on GitHub | stars:4 | 2019-10-24 |
| Proof-of-concept repository on GitHub | stars:0 | 2019-10-24 |
| Proof-of-concept repository on GitHub | stars:1 | 2019-10-24 |
| Proof-of-concept repository on GitHub | stars:27 | 2019-10-24 |
| Proof-of-concept repository on GitHub | stars:147 | 2019-10-28 |
| Proof-of-concept repository on GitHub | stars:1 | 2019-10-28 |
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
- First PoC-35 d
- Metasploit-6 d
- Published
- CISA KEV+879 d
- TodayNov 6, 2026+2566 d
No history yet (it accumulates with the daily EPSS job).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-19-239 · Oct 29, 2019(PHP için Güvenlik Güncellemeleri Yayınladı)
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvd-primary
Root cause
When data is copied, the source length is not compared with the size of the destination buffer. Excess data overwrites adjacent memory.
The bug in code
The whole CWE-120 classA representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.
Vulnerable
char buf[256];
memcpy(buf, pkt->data, pkt->len);Fixed
char buf[256];
if (pkt->len > sizeof(buf)) {
return -EINVAL;
}
memcpy(buf, pkt->data, pkt->len);Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Overflow BuffersCAPEC-100likelihood: High · Very High
- Client-side Injection-induced Buffer OverflowCAPEC-14likelihood: Medium · High
- Filter Failure through Buffer OverflowCAPEC-24likelihood: High · High
- MIME ConversionCAPEC-42likelihood: High · High
- Overflow Binary Resource FileCAPEC-44likelihood: High · Very High
- Buffer Overflow via Symbolic LinksCAPEC-45likelihood: High · High
- Overflow Variables and TagsCAPEC-46likelihood: High · High
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (19 more)Show less
- lists.opensuse.org/opensuse-security-announce/2019-11/msg00011.html
- lists.opensuse.org/opensuse-security-announce/2019-11/msg00014.html
- seclists.org/fulldisclosure/2020/Jan/40
- access.redhat.com/errata/RHSA-2019:3286
- access.redhat.com/errata/RHSA-2019:3287
- access.redhat.com/errata/RHSA-2019:3299
- access.redhat.com/errata/RHSA-2019:3300
- access.redhat.com/errata/RHSA-2019:3724
- access.redhat.com/errata/RHSA-2019:3735
- access.redhat.com/errata/RHSA-2019:3736
- access.redhat.com/errata/RHSA-2020:0322
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3W23TP6X4H7LB645FYZLUPNIRD5W3EPU/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FSNBUSPKMLUHHOADROKNG5GDWDCRHT5M/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T62LF4ZWVV7OMMIZFO6IFO5QLZKK7YRD/
- seclists.org/bugtraq/2020/Jan/44
- security.netapp.com/advisory/ntap-20191031-0003/
- support.apple.com/kb/HT210919
- support.f5.com/csp/article/K75408500?utm_source=f5support&%3Butm_medium=RSS
- usn.ubuntu.com/4166-1/
Vendor advisories and official records. Exploit/PoC links are deliberately left out.