CVE-2021-44790
Possible buffer overflow when parsing multipart content in mod_lua of Apache HTTP Server 2.4.51 and earlier
02 Description
Possible buffer overflow when parsing multipart content in mod_lua of Apache HTTP Server 2.4.51 and earlier
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 96.84% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 99.8% of scored records. A rank, not a probability.
- NVD base score
- 9.8 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVD analysis status
- Analyzed. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Important. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2021-12-20 00:00Z4 YR AGO
- Last updated
- 2024-08-04 04:32Z2 YR AGO
- Reserved
- 2021-12-10
- Assigning CNA
- apache
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- CWE-787Out-of-bounds WriteBase
- Data version
- 5.1
- Document digest
- 7363f861da7a7fc41b786a4644ca37efd4a01253a7784c73f651f63bd6271faf
05 Affected products
06 References
- httpd.apache.orghttp://httpd.apache.org/security/vulnerabilities_24.html
- www.openwall.com[oss-security] 20211220 CVE-2021-44790: Apache HTTP Server: Possible buffer overflow when parsing multipart content in mod_lua of Apache HTTP Server 2.4.51 and earlierhttp://www.openwall.com/lists/oss-security/2021/12/20/4
- lists.fedoraproject.orgFEDORA-2021-29a536c2aehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BFSWOH4X77CV7AH7C4RMHUBDWKQDL4YH/
- www.debian.orgDSA-5035https://www.debian.org/security/2022/dsa-5035
- www.oracle.comhttps://www.oracle.com/security-alerts/cpujan2022.html
- security.netapp.comhttps://security.netapp.com/advisory/ntap-20211224-0001/
- www.tenable.comhttps://www.tenable.com/security/tns-2022-01
- www.tenable.comhttps://www.tenable.com/security/tns-2022-03
- lists.fedoraproject.orgFEDORA-2022-b4103753e9https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGWILBORT67SHMSLYSQZG2NMXGCMPUZO/
- lists.fedoraproject.orgFEDORA-2022-21264ec6dbhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z7H26WJ6TPKNWV3QKY4BHKUKQVUTZJTD/
- lists.fedoraproject.orgFEDORA-2022-78e3211c55https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X73C35MMMZGBVPQQCH7LQZUMYZNQA5FO/
- www.oracle.comhttps://www.oracle.com/security-alerts/cpuapr2022.html
- support.apple.comhttps://support.apple.com/kb/HT213257
- support.apple.comhttps://support.apple.com/kb/HT213256
- support.apple.comhttps://support.apple.com/kb/HT213255
- seclists.org20220516 APPLE-SA-2022-05-16-4 Security Update 2022-004 Catalinahttp://seclists.org/fulldisclosure/2022/May/33
- seclists.org20220516 APPLE-SA-2022-05-16-3 macOS Big Sur 11.6.6http://seclists.org/fulldisclosure/2022/May/35
- seclists.org20220516 APPLE-SA-2022-05-16-2 macOS Monterey 12.4http://seclists.org/fulldisclosure/2022/May/38
- security.gentoo.orgGLSA-202208-20https://security.gentoo.org/glsa/202208-20
- packetstormsecurity.comhttp://packetstormsecurity.com/files/171631/Apache-2.4.x-Buffer-Overflow.html
07 Fixed in
AlmaLinux 8
- httpd Fixed in 2.4.37-43.module_el8.5.0+2609+b30d9eec.1.alma
- httpd-devel Fixed in 2.4.37-43.module_el8.5.0+2609+b30d9eec.1.alma
- httpd-filesystem Fixed in 2.4.37-43.module_el8.5.0+2609+b30d9eec.1.alma
- httpd-manual Fixed in 2.4.37-43.module_el8.5.0+2609+b30d9eec.1.alma
- httpd-tools Fixed in 2.4.37-43.module_el8.5.0+2609+b30d9eec.1.alma
- mod_http2 Fixed in 1.15.7-3.module_el8.5.0+2609+b30d9eec
- mod_ldap Fixed in 2.4.37-43.module_el8.5.0+2609+b30d9eec.1.alma
- mod_md Fixed
A version is affected if any line below covers it.
- Affected before 1:2.0.8-8.module_el8.5.0+2609+b30d9eec
- Affected before 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa
- mod_proxy_html Fixed in 1:2.4.37-43.module_el8.5.0+2609+b30d9eec.1.alma
- mod_session Fixed in 2.4.37-43.module_el8.5.0+2609+b30d9eec.1.alma
- mod_ssl Fixed in 1:2.4.37-43.module_el8.5.0+2609+b30d9eec.1.alma
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 8
- httpd Fixed in 2.4.37-43.module_el8.5.0+2609+b30d9eec.1.alma
- httpd-devel Fixed in 2.4.37-43.module_el8.5.0+2609+b30d9eec.1.alma
- httpd-filesystem Fixed in 2.4.37-43.module_el8.5.0+2609+b30d9eec.1.alma
- httpd-manual Fixed in 2.4.37-43.module_el8.5.0+2609+b30d9eec.1.alma
- httpd-tools Fixed in 2.4.37-43.module_el8.5.0+2609+b30d9eec.1.alma
- mod_http2 Fixed in 1.15.7-3.module_el8.5.0+2609+b30d9eec
- mod_ldap Fixed in 2.4.37-43.module_el8.5.0+2609+b30d9eec.1.alma
- mod_md Fixed
A version is affected if any line below covers it.
- Affected before 1:2.0.8-8.module_el8.5.0+2609+b30d9eec
- Affected before 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa
- mod_proxy_html Fixed in 1:2.4.37-43.module_el8.5.0+2609+b30d9eec.1.alma
- mod_session Fixed in 2.4.37-43.module_el8.5.0+2609+b30d9eec.1.alma
- mod_ssl Fixed in 1:2.4.37-43.module_el8.5.0+2609+b30d9eec.1.alma
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- apache2 Fixed in 2.4.52-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- apache2 Fixed in 2.4.52-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- apache2 Fixed in 2.4.52-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- apache2 Fixed in 2.4.29-1ubuntu4.21
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- apache2 Fixed in 2.4.41-4ubuntu3.9
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- apache2 Fixed in 2.4.52-1ubuntu1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 14.04 LTS
- apache2 Fixed in 2.4.7-1ubuntu4.22+esm3Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 16.04 LTS
- apache2 Fixed in 2.4.18-2ubuntu3.17+esm4Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.