CVE-2021-34798
HIGH7.5EPSS 10.3%NULL pointer dereference in httpd core
Published: 9/16/2021Modified: 4/28/2026
Description
Malformed requests may cause the server to dereference a NULL pointer. This issue affects Apache HTTP Server 2.4.48 and earlier.
Affected packages (5)
- Alpine/apache2from 0, < 2.4.49-r0
- Bitnami/apachefrom 0, < 2.4.49
- Debian/apache2from 0, < 2.4.51-1~deb11u1
- Debian/apache2from 0, < 2.4.25-3+deb9u11
- Debian/apache2from 0, < 2.4.38-3+deb10u6
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
References (20)
- ADVISORYhttps://security.alpinelinux.org/vuln/CVE-2021-34798
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2021-34798
- WEBhttp://httpd.apache.org/security/vulnerabilities_24.html
- WEBhttps://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf
- WEBhttps://kc.mcafee.com/corporate/index?page=content&id=SB10379
- WEBhttps://lists.apache.org/thread.html/r3925e167d5eb1c75def3750c155d753064e1d34a143028bb32910432%40%3Cusers.httpd.apache.org%3E
- WEBhttps://lists.apache.org/thread.html/r61fdbfc26ab170f4e6492ef3bd5197c20b862ce156e9d5a54d4b899c%40%3Cusers.httpd.apache.org%3E
- WEBhttps://lists.apache.org/thread.html/r82838efc5fa6fc4c73986399c9b71573589f78b31846aff5bd9b1697%40%3Cusers.httpd.apache.org%3E
- WEBhttps://lists.apache.org/thread.html/r82c077663f9759c7df5a6656f925b3ee4f55fcd33c889ba7cd687029%40%3Cusers.httpd.apache.org%3E
- WEBhttps://lists.debian.org/debian-lts-announce/2021/10/msg00001.html
- WEBhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPBR6WUYBJNACHKE65SPL7TJOHX7RHWD/
- WEBhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R/
- WEBhttps://nvd.nist.gov/vuln/detail/CVE-2021-34798
- WEBhttps://security.gentoo.org/glsa/202208-20
- WEBhttps://security.netapp.com/advisory/ntap-20211008-0004/
- WEBhttps://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ
- WEBhttps://www.debian.org/security/2021/dsa-4982
- WEBhttps://www.oracle.com/security-alerts/cpuapr2022.html
- WEBhttps://www.oracle.com/security-alerts/cpujan2022.html
- WEBhttps://www.tenable.com/security/tns-2021-17