CVE-2021-34798
NULL pointer dereference in httpd core
02 Description
NULL pointer dereference in httpd core
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
- 64.50% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 99.1% of scored records. A rank, not a probability.
- NVD base score
- 7.5 (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:N/I:N/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Moderate. 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
- 2021-09-16 14:40Z5 YR AGO
- Last updated
- 2024-08-04 00:26Z2 YR AGO
- Reserved
- 2021-06-16
- Assigning CNA
- apache
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- CWE-476NULL Pointer DereferenceBase
- Data version
- 5.1
- Document digest
- 04e6b3ccdfd1706db2a0223919930a000f3051769e4e0455d3badc0c998a67a1
05 Affected products
06 References
- httpd.apache.orghttp://httpd.apache.org/security/vulnerabilities_24.html
- lists.fedoraproject.orgFEDORA-2021-dce7e7738ehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPBR6WUYBJNACHKE65SPL7TJOHX7RHWD/
- lists.apache.org[httpd-users] 20210923 [users@httpd] 2.4.49 security fixes: more infohttps://lists.apache.org/thread.html/r82838efc5fa6fc4c73986399c9b71573589f78b31846aff5bd9b1697%40%3Cusers.httpd.apache.org%3E
- lists.apache.org[httpd-users] 20210923 Re: [users@httpd] 2.4.49 security fixes: more infohttps://lists.apache.org/thread.html/r82c077663f9759c7df5a6656f925b3ee4f55fcd33c889ba7cd687029%40%3Cusers.httpd.apache.org%3E
- lists.apache.org[httpd-users] 20210923 [users@httpd] Re: [External] : [users@httpd] 2.4.49 security fixes: more infohttps://lists.apache.org/thread.html/r3925e167d5eb1c75def3750c155d753064e1d34a143028bb32910432%40%3Cusers.httpd.apache.org%3E
- lists.apache.org[httpd-users] 20210923 Re: [users@httpd] Re: [External] : [users@httpd] 2.4.49 security fixes: more infohttps://lists.apache.org/thread.html/r61fdbfc26ab170f4e6492ef3bd5197c20b862ce156e9d5a54d4b899c%40%3Cusers.httpd.apache.org%3E
- lists.fedoraproject.orgFEDORA-2021-e3f6dd670dhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R/
- lists.debian.org[debian-lts-announce] 20211002 [SECURITY] [DLA 2776-1] apache2 security updatehttps://lists.debian.org/debian-lts-announce/2021/10/msg00001.html
- www.debian.orgDSA-4982https://www.debian.org/security/2021/dsa-4982
- tools.cisco.com20211124 Multiple Vulnerabilities in Apache HTTP Server Affecting Cisco Products: November 2021https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ
- www.oracle.comhttps://www.oracle.com/security-alerts/cpujan2022.html
- www.tenable.comhttps://www.tenable.com/security/tns-2021-17
- security.netapp.comhttps://security.netapp.com/advisory/ntap-20211008-0004/
- kc.mcafee.comhttps://kc.mcafee.com/corporate/index?page=content&id=SB10379
- www.oracle.comhttps://www.oracle.com/security-alerts/cpuapr2022.html
- cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf
- security.gentoo.orgGLSA-202208-20https://security.gentoo.org/glsa/202208-20
07 Fixed in
AlmaLinux 8
- httpd Fixed in 2.4.37-43.module_el8.5.0+2630+51c6d843.2.alma
- httpd-devel Fixed in 2.4.37-43.module_el8.5.0+2630+51c6d843.2.alma
- httpd-filesystem Fixed in 2.4.37-43.module_el8.5.0+2630+51c6d843.2.alma
- httpd-manual Fixed in 2.4.37-43.module_el8.5.0+2630+51c6d843.2.alma
- httpd-tools Fixed in 2.4.37-43.module_el8.5.0+2630+51c6d843.2.alma
- mod_ldap Fixed in 2.4.37-43.module_el8.5.0+2630+51c6d843.2.alma
- mod_md Fixed in 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+2630+51c6d843.2.alma
- mod_session Fixed in 2.4.37-43.module_el8.5.0+2630+51c6d843.2.alma
- mod_ssl Fixed in 1:2.4.37-43.module_el8.5.0+2630+51c6d843.2.alma
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Arch Linux
- apache Fixed in 2.4.49-1
Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.
CloudLinux 8
- httpd Fixed in 2.4.37-43.module_el8.5.0+2630+51c6d843.2.alma
- httpd-devel Fixed in 2.4.37-43.module_el8.5.0+2630+51c6d843.2.alma
- httpd-filesystem Fixed in 2.4.37-43.module_el8.5.0+2630+51c6d843.2.alma
- httpd-manual Fixed in 2.4.37-43.module_el8.5.0+2630+51c6d843.2.alma
- httpd-tools Fixed in 2.4.37-43.module_el8.5.0+2630+51c6d843.2.alma
- mod_ldap Fixed in 2.4.37-43.module_el8.5.0+2630+51c6d843.2.alma
- mod_md Fixed in 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+2630+51c6d843.2.alma
- mod_session Fixed in 2.4.37-43.module_el8.5.0+2630+51c6d843.2.alma
- mod_ssl Fixed in 1:2.4.37-43.module_el8.5.0+2630+51c6d843.2.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 2.4.49-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- apache2 Fixed in 2.4.49-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- apache2 Fixed in 2.4.49-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- apache2 Fixed in 2.4.29-1ubuntu4.17
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 2.4.41-4ubuntu3.5
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+esm2Available 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+esm2Available 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.