CVE-2024-27316: Apache HTTP Server: HTTP/2 DoS by memory exhaustion on endless continuation frames
Noroxi assessment
Priority: Plan (action score 57/100)
- Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
- Probability of exploitation in the next 30 days: 88.7% (FIRST EPSS); higher than 99.7% 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.
- According to CISA the attack is automatable: targets can be found by mass scanning.
- Fixed version: azl3 httpd 2.4.58-4 on Azure Linux 3.0 2.4.61-1; azl3 httpd 2.4.61-1 on Azure Linux 3.0 2.4.61-1; azl3 mod_http2 2.0.29-3 on Azure Linux 3.0 2.0.29-3.
Add it to your regular patch cycle. Upgrade to azl3 httpd 2.4.58-4 on Azure Linux 3.0 2.4.61-1; azl3 httpd 2.4.61-1 on Azure Linux 3.0 2.4.61-1; azl3 mod_http2 2.0.29-3 on Azure Linux 3.0 2.0.29-3 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
HTTP/2 incoming headers exceeding the limit are temporarily buffered in nghttp2 in order to generate an informative HTTP 413 response. If a client does not stop sending headers, this leads to memory exhaustion.
- Published
- Apr 4, 2024
- Updated
- Jun 17, 2026
- EPSS
- 88.7% · 99th percentile
- CWE
- CWE-770
Report tools
Action score
57
Add it to your regular patch cycle.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 27 / 30 · 88.7%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
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.
Is Apache HTTP Server on your server exposed to the internet?Run a port scan
Is your version affected? Check itNoroxi 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 |
|---|---|---|
| apache | http server | cpe:2.3:a:apache:http_server |
| fedoraproject | fedora | cpe:2.3:o:fedoraproject:fedora |
| netapp | ontap | cpe:2.3:a:netapp:ontap |
Using http server? Add it to your stack and be the first to know about CVEs like this one. (Apache HTTP)
Is Apache HTTP Server on your server exposed to the internet?
The free port scanner finds the open ports on your server and matches the service versions it can read against known vulnerabilities. No account needed.
Run a port scanVersions reported by the vendor
Affected version ranges reported by the assigning authority (apache). Independent of NVD's CPE analysis and usually ahead of it.
Apache Software Foundation Apache HTTP Server
- 2.4.17 and later · up to and including 2.4.58affected · semver
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- apache http server2.4.17 and later · before 2.4.59
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | httpd | before 2.4.37-62.module_el8.9.0+3646+acd210d0 | 2.4.37-62.module_el8.9.0+3646+acd210d0 |
| AlmaLinux:8 | httpd-devel | before 2.4.37-62.module_el8.9.0+3646+acd210d0 | 2.4.37-62.module_el8.9.0+3646+acd210d0 |
| AlmaLinux:8 | httpd-filesystem | before 2.4.37-62.module_el8.9.0+3646+acd210d0 | 2.4.37-62.module_el8.9.0+3646+acd210d0 |
| AlmaLinux:8 | httpd-manual | before 2.4.37-62.module_el8.9.0+3646+acd210d0 | 2.4.37-62.module_el8.9.0+3646+acd210d0 |
| AlmaLinux:8 | httpd-tools | before 2.4.37-62.module_el8.9.0+3646+acd210d0 | 2.4.37-62.module_el8.9.0+3646+acd210d0 |
| AlmaLinux:8 | mod_http2 | before 1.15.7-8.module_el8.9.0+3809+48080a14.5.alma.1 | 1.15.7-8.module_el8.9.0+3809+48080a14.5.alma.1 |
| AlmaLinux:8 | mod_ldap | before 2.4.37-62.module_el8.9.0+3646+acd210d0 | 2.4.37-62.module_el8.9.0+3646+acd210d0 |
| AlmaLinux:8 | mod_md | before 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa | 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa |
| AlmaLinux:8 | mod_md | before 1:2.0.8-8.module_el8.6.0+3031+fb177b09 | 1:2.0.8-8.module_el8.6.0+3031+fb177b09 |
| AlmaLinux:8 | mod_proxy_html | before 1:2.4.37-62.module_el8.9.0+3646+acd210d0 | 1:2.4.37-62.module_el8.9.0+3646+acd210d0 |
| AlmaLinux:8 | mod_session | before 2.4.37-62.module_el8.9.0+3646+acd210d0 | 2.4.37-62.module_el8.9.0+3646+acd210d0 |
| AlmaLinux:8 | mod_ssl | before 1:2.4.37-62.module_el8.9.0+3646+acd210d0 | 1:2.4.37-62.module_el8.9.0+3646+acd210d0 |
| AlmaLinux:9 | mod_http2 | before 1.15.19-5.el9_3.1 | 1.15.19-5.el9_3.1 |
| AlmaLinux:9 | mod_http2 | before 2.0.26-2.el9_4 | 2.0.26-2.el9_4 |
| Alpine:v3.16 | apache2 | before 2.4.59-r0 | 2.4.59-r0 |
| Debian:10 | apache2 | before 2.4.59-1~deb10u1 | 2.4.59-1~deb10u1 |
| Debian:11 | apache2 | before 2.4.59-1~deb11u1 | 2.4.59-1~deb11u1 |
| Debian:12 | apache2 | before 2.4.59-1~deb12u1 | 2.4.59-1~deb12u1 |
| Debian:13 | apache2 | before 2.4.59-1 | 2.4.59-1 |
| openSUSE:Leap 15.5 | apache2 | before 2.4.51-150400.6.17.1 | 2.4.51-150400.6.17.1 |
| openSUSE:Leap 15.6 | apache2 | before 2.4.58-150600.5.3.1 | 2.4.58-150600.5.3.1 |
| openSUSE:Leap 15.6 | apache2-devel | before 2.4.58-150600.5.3.1 | 2.4.58-150600.5.3.1 |
| openSUSE:Leap 15.6 | apache2-event | before 2.4.58-150600.5.3.1 | 2.4.58-150600.5.3.1 |
| openSUSE:Leap 15.6 | apache2-manual | before 2.4.58-150600.5.3.1 | 2.4.58-150600.5.3.1 |
+96
Same product
apache: all recordsOther highest-scoring records for the same primary product.
- CVE-2021-42013Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773)KEV99Now
- CVE-2021-41773Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49KEV99Now
- CVE-2024-38475Apache HTTP Server weakness in mod_rewrite when first segment of substitution matches filesystem path.KEV96Now
Published before and after this one in the same product
- ← EarlierCVE-2023-38709Apr 4, 2024 · Apache HTTP Server: HTTP response splitting30Monitor
- ← EarlierCVE-2024-24795Apr 4, 2024 · Apache HTTP Server: HTTP Response Splitting in multiple modules26Monitor
- Later →CVE-2024-36387Jul 1, 2024 · Apache HTTP Server: DoS by Null pointer in websocket over HTTP/222Monitor
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 |
|---|---|---|
| azl3 httpd 2.4.58-4 on Azure Linux 3.0 | 2.4.61-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| azl3 httpd 2.4.61-1 on Azure Linux 3.0 | 2.4.61-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| azl3 mod_http2 2.0.29-3 on Azure Linux 3.0 | 2.0.29-3 · CBL-Mariner Releases | Microsoft (MSRC) |
| cbl2 httpd 2.4.58-1 on CBL Mariner 2.0 | 2.4.59-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| cbl2 httpd 2.4.58-1 on CBL-Mariner 2.0 | 2.4.59-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| cbl2 httpd 2.4.59-1 on CBL Mariner 2.0 | 2.4.59-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| almalinux:httpd | 2.4.37-62.module_el8.9.0+3646+acd210d0 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:httpd-devel | 2.4.37-62.module_el8.9.0+3646+acd210d0 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:httpd-filesystem | 2.4.37-62.module_el8.9.0+3646+acd210d0 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:httpd-manual | 2.4.37-62.module_el8.9.0+3646+acd210d0 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:httpd-tools | 2.4.37-62.module_el8.9.0+3646+acd210d0 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:mod_http2 | 1.15.7-8.module_el8.9.0+3809+48080a14.5.alma.1 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:mod_ldap | 2.4.37-62.module_el8.9.0+3646+acd210d0 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:mod_md | 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa · AlmaLinux:8 | Package registry (OSV) |
| almalinux:mod_proxy_html | 1:2.4.37-62.module_el8.9.0+3646+acd210d0 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:mod_session | 2.4.37-62.module_el8.9.0+3646+acd210d0 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:mod_ssl | 1:2.4.37-62.module_el8.9.0+3646+acd210d0 · AlmaLinux:8 | Package registry (OSV) |
| alpine:apache2 | 2.4.59-r0 · Alpine:v3.16 | Package registry (OSV) |
| debian:apache2 | 2.4.59-1~deb12u1 · Debian:12 | Package registry (OSV) |
| opensuse:apache2 | 2.4.51-150400.6.17.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:apache2-devel | 2.4.58-150600.5.3.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:apache2-event | 2.4.58-150600.5.3.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:apache2-manual | 2.4.58-150600.5.3.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:apache2-prefork | 2.4.58-150600.5.3.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:apache2-utils | 2.4.58-150600.5.3.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:apache2-worker | 2.4.58-150600.5.3.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| red hat:httpd | 0:2.4.37-62.module+el8.9.0+19699+7a7a2044 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:httpd-debuginfo | 0:2.4.37-62.module+el8.9.0+19699+7a7a2044 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:httpd-debugsource | 0:2.4.37-62.module+el8.9.0+19699+7a7a2044 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:httpd-devel | 0:2.4.37-62.module+el8.9.0+19699+7a7a2044 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
+19
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 ×2
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:18 | 2024-04-09 |
| Proof-of-concept repository on GitHub | stars:2 | 2024-04-17 |
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+4 d
- TodayNov 14, 2026+953 d
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
Not on record for this CVE: patch commit or PR link · variant or chain candidate · public bounty program.
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-770 · Allocation of Resources Without Limits or ThrottlingCVSS 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)
- FloodingCAPEC-125likelihood: High · Medium
- Excessive AllocationCAPEC-130likelihood: Medium · Medium
- XML Ping of the DeathCAPEC-147likelihood: Low · Medium
- Exponential Data ExpansionCAPEC-197likelihood: High · Medium
- Serialized Data Parameter BlowupCAPEC-229likelihood: High · High
- Serialized Data with Nested PayloadsCAPEC-230likelihood: Medium · High
- Oversized Serialized Data PayloadsCAPEC-231likelihood: Medium · High
- HTTP DoSCAPEC-469Low
ATT&CK techniques
- Network Denial of Service:Direct Network FloodT1498.001
- Network Denial of Service:Reflection AmplificationT1498.002
- Endpoint Denial of ServiceT1499
- Endpoint Denial of Service: OS Exhaustion FloodT1499.001
- Endpoint Denial of Service:Service Exhaustion FloodT1499.002
- Endpoint Denial of Service:Application Exhaustion FloodT1499.003
Change log (1)
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (9 more)Show less
- www.openwall.com/lists/oss-security/2024/04/04/4
- httpd.apache.org/security/vulnerabilities_24.html
- support.apple.com/kb/HT214119
- www.openwall.com/lists/oss-security/2024/04/03/16
- lists.debian.org/debian-lts-announce/2024/05/msg00013.html
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FO73U3SLBYFGIW2YKXOK7RI4D6DJSZ2B/
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MIUBKSCJGPJ6M2U63V6BKFDF725ODLG7/
- security.netapp.com/advisory/ntap-20240415-0013/
- www.kb.cert.org/vuls/id/421644
Vendor advisories and official records. Exploit/PoC links are deliberately left out.