libcurl versions from 7.36.0 to before 7.64.0 is vulnerable to a heap buffer out-of-bounds read.
Noroxi assessment
Priority: Monitor (action score 32/100)
- Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
- Probability of exploitation in the next 30 days: 5.3% (FIRST EPSS); higher than 92.5% 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: curl (Alpine:v3.10) 7.64.0-r0; curl (Alpine:v3.6) 7.61.1-r2; curl (Debian:12) 7.64.0-1.
- Severity is disputed: the assigning authority (CNA) scores it 5.4, NVD 7.5.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to curl (Alpine:v3.10) 7.64.0-r0; curl (Alpine:v3.6) 7.61.1-r2; curl (Debian:12) 7.64.0-1 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 · FIRST EPSS
libcurl versions from 7.36.0 to before 7.64.0 is vulnerable to a heap buffer out-of-bounds read. The function handling incoming NTLM type-2 messages (`lib/vauth/ntlm.c:ntlm_decode_type2_target`) does not validate incoming data correctly and is subject to an integer overflow vulnerability. Using that overflow, a malicious or broken NTLM server could trick libcurl to accept a bad length + offset combination that would lead to a buffer read out-of-bounds.
- Published
- Feb 6, 2019
- Updated
- Jun 16, 2026
- EPSS
- 5.3% · 92th percentile
- CWE
- CWE-125
Report tools
Action score
32
Monitor
Low priority for now.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 2 / 30 · 5.3%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 7.5
- CNA · redhat
- 5.4
- 2.1 point gap
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- Proof of concept exists, no weaponized module
- 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 |
|---|---|---|
| haxx | libcurl | cpe:2.3:a:haxx:libcurl |
| canonical | ubuntu linux | cpe:2.3:o:canonical:ubuntu_linux |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
| netapp | clustered data ontap | cpe:2.3:o:netapp:clustered_data_ontap |
| siemens | sinema remote connect client | cpe:2.3:a:siemens:sinema_remote_connect_client |
| oracle | communications operations monitor | cpe:2.3:a:oracle:communications_operations_monitor |
| oracle | http server | cpe:2.3:a:oracle:http_server |
| oracle | secure global desktop | cpe:2.3:a:oracle:secure_global_desktop |
| redhat | enterprise linux | cpe:2.3:o:redhat:enterprise_linux |
| f5 | big-ip access policy manager | cpe:2.3:a:f5:big-ip_access_policy_manager |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- canonical ubuntu linux14.04
- canonical ubuntu linux16.04
- canonical ubuntu linux18.04
- canonical ubuntu linux18.10
- debian debian linux9.0
- f5 big-ip access policy manager14.0.0 and later · up to 14.1.2 inclusive
- f5 big-ip access policy manager15.0.0 and later · up to 15.0.1 inclusive
- f5 big-ip access policy manager13.1.0 and later · up to 13.1.3 inclusive
- haxx libcurl7.36.0 and later · before 7.64.0
- netapp clustered data ontapall versions
- oracle communications operations monitor3.4
- oracle communications operations monitor4.0
- oracle http server12.2.1.3.0
- oracle secure global desktop5.4
- redhat enterprise linux8.0
- siemens sinema remote connect clientup to 2.0 inclusive
Versions reported by the vendor
Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.
The curl Project curl
- 7.64.0affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Alpine:v3.10 | curl | before 7.64.0-r0 | 7.64.0-r0 |
| Alpine:v3.6 | curl | before 7.61.1-r2 | 7.61.1-r2 |
| Debian:12 | curl | before 7.64.0-1 | 7.64.0-1 |
| Debian:8 | curl | before 7.38.0-4+deb8u14 | 7.38.0-4+deb8u14 |
| Debian:9 | curl | before 7.52.1-5+deb9u9 | 7.52.1-5+deb9u9 |
| openSUSE:Leap 15.0 | curl | before 7.60.0-lp150.2.18.1 | 7.60.0-lp150.2.18.1 |
| openSUSE:Leap 15.0 | curl-mini | before 7.60.0-lp150.2.18.1 | 7.60.0-lp150.2.18.1 |
| Red Hat:enterprise_linux:8::baseos | curl | before 0:7.61.1-11.el8 | 0:7.61.1-11.el8 |
| Red Hat:enterprise_linux:8::baseos | curl-debuginfo | before 0:7.61.1-11.el8 | 0:7.61.1-11.el8 |
| Red Hat:enterprise_linux:8::baseos | curl-debugsource | before 0:7.61.1-11.el8 | 0:7.61.1-11.el8 |
| Red Hat:enterprise_linux:8::baseos | curl-minimal-debuginfo | before 0:7.61.1-11.el8 | 0:7.61.1-11.el8 |
| Red Hat:enterprise_linux:8::baseos | libcurl | before 0:7.61.1-11.el8 | 0:7.61.1-11.el8 |
| Red Hat:enterprise_linux:8::baseos | libcurl-debuginfo | before 0:7.61.1-11.el8 | 0:7.61.1-11.el8 |
| Red Hat:enterprise_linux:8::baseos | libcurl-devel | before 0:7.61.1-11.el8 | 0:7.61.1-11.el8 |
| Red Hat:enterprise_linux:8::baseos | libcurl-minimal | before 0:7.61.1-11.el8 | 0:7.61.1-11.el8 |
| Red Hat:enterprise_linux:8::baseos | libcurl-minimal-debuginfo | before 0:7.61.1-11.el8 | 0:7.61.1-11.el8 |
| SUSE:Linux Enterprise Desktop 12 SP4 | curl | before 7.60.0-4.3.1 | 7.60.0-4.3.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 | curl | before 7.60.0-3.17.1 | 7.60.0-3.17.1 |
| SUSE:OpenStack Cloud 7 | curl | before 7.37.0-37.34.1 | 7.37.0-37.34.1 |
Same product
haxx: all recordsOther highest-scoring records for the same primary product.
- CVE-2023-38545This flaw makes curl overflow a heap based buffer in the SOCKS5 proxy
handshake.63This week
- CVE-2019-5436A heap buffer overflow in the TFTP receiving code allows for DoS or arbitrary code execution in libcurl versions 7.19.4 through 7.64.1.46Plan
- CVE-2019-3822libcurl versions from 7.36.0 to before 7.64.0 are vulnerable to a stack-based buffer overflow.43Plan
Published before and after this one in the same product
- ← EarlierCVE-2016-8622Jul 31, 2018 · The URL percent-encoding decode function in libcurl before 7.51.0 is called `curl_easy_unescape`.40Plan
- ← EarlierCVE-2018-14618Sep 5, 2018 · curl before version 7.61.1 is vulnerable to a buffer overrun in the NTLM authentication code.42Plan
- Later →CVE-2019-3823Feb 6, 2019 · libcurl versions from 7.34.0 to before 7.64.0 are vulnerable to a heap out-of-bounds read in the code handling the end-of-response for SMTP.31Monitor
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 |
|---|---|---|
| alpine:curl | 7.64.0-r0 · Alpine:v3.10 | Package registry (OSV) |
| debian:curl | 7.64.0-1 · Debian:12 | Package registry (OSV) |
| opensuse:curl | 7.60.0-lp150.2.18.1 · openSUSE:Leap 15.0 | Package registry (OSV) |
| opensuse:curl-mini | 7.60.0-lp150.2.18.1 · openSUSE:Leap 15.0 | Package registry (OSV) |
| red hat:curl | 0:7.61.1-11.el8 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:curl-debuginfo | 0:7.61.1-11.el8 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:curl-debugsource | 0:7.61.1-11.el8 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:curl-minimal-debuginfo | 0:7.61.1-11.el8 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:libcurl | 0:7.61.1-11.el8 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:libcurl-debuginfo | 0:7.61.1-11.el8 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:libcurl-devel | 0:7.61.1-11.el8 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:libcurl-minimal | 0:7.61.1-11.el8 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:libcurl-minimal-debuginfo | 0:7.61.1-11.el8 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| suse:curl | 7.60.0-3.17.1 · SUSE:Linux Enterprise Module for Basesystem 15 | Package registry (OSV) |
Exploit status
Proof of concept available
A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.
Evidence
- Proof-of-concept repository on GitHub ×1
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 |
|---|---|---|
| Proof-of-concept repository on GitHub | stars:0 | 2020-04-07 |
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.
- Published
- First PoC+425 d
- TodayOct 22, 2026+2814 d
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
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.
No credits in the CNA record.
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
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-20-905 · Oct 30, 2020(OpenShift Güvenlik Güncellemesi)
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
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-125 · Out-of-bounds ReadCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvd-primary
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)
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (11 more)Show less
- access.redhat.com/errata/RHSA-2019:3701
- bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16890
- cert-portal.siemens.com/productcert/pdf/ssa-436177.pdf
- curl.haxx.se/docs/CVE-2018-16890.html
- lists.apache.org/thread.html/8338a0f605bdbb3a6098bb76f666a95fc2b2f53f37fa1ecc89f1146f%40%3Cdevnull.infra.apache.org%3E
- security.netapp.com/advisory/ntap-20190315-0001/
- support.f5.com/csp/article/K03314397?utm_source=f5support&%3Butm_medium=RSS
- usn.ubuntu.com/3882-1/
- www.debian.org/security/2019/dsa-4386
- www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
- www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.