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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2021-31618 Detail

Description

Apache HTTP Server protocol handler for the HTTP/2 protocol checks received request headers against the size limitations as configured for the server and used for the HTTP/1 protocol as well. On violation of these restrictions and HTTP response is sent to the client with a status code indicating why the request was rejected. This rejection response was not fully initialised in the HTTP/2 protocol handler if the offending header was the very first one received or appeared in a a footer. This led to a NULL pointer dereference on initialised memory, crashing reliably the child process. Since such a triggering HTTP/2 request is easy to craft and submit, this can be exploited to DoS the server. This issue affected mod_http2 1.15.17 and Apache HTTP Server version 2.4.47 only. Apache HTTP Server 2.4.47 was never released.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
http://httpd.apache.org/security/vulnerabilities_24.html Apache Software Foundation, CVE Release Notes  Vendor Advisory 
http://www.openwall.com/lists/oss-security/2021/06/10/9 Apache Software Foundation, CVE Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2024/03/13/2 Apache Software Foundation, CVE
https://lists.apache.org/thread.html/r14b66ef0f4f569fd515a3f96cd4eb58bd9a8ff525cc326bb0359664f%40%3Ccvs.httpd.apache.org%3E Apache Software Foundation, CVE
https://lists.apache.org/thread.html/r783b6558abf3305b17ea462bed4bd66d82866438999bf38cef6d11d1%40%3Ccvs.httpd.apache.org%3E Apache Software Foundation, CVE
https://lists.debian.org/debian-lts-announce/2021/07/msg00006.html Apache Software Foundation, CVE Mailing List  Third Party Advisory 
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2NKJ3ZA3FTSZ2QBBPKS6BYGAWYRABNQQ/ Apache Software Foundation, CVE
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A73QJ4HPUMU26I6EULG6SCK67TUEXZYR/ Apache Software Foundation, CVE
https://seclists.org/oss-sec/2021/q2/206 Apache Software Foundation, CVE Mailing List  Third Party Advisory 
https://security.gentoo.org/glsa/202107-38 Apache Software Foundation, CVE Third Party Advisory 
https://security.netapp.com/advisory/ntap-20210727-0008/ Apache Software Foundation, CVE Third Party Advisory 
https://www.debian.org/security/2021/dsa-4937 Apache Software Foundation, CVE Third Party Advisory 
https://www.oracle.com/security-alerts/cpuoct2021.html Apache Software Foundation, CVE Patch  Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-476 NULL Pointer Dereference cwe source acceptance level NIST   Apache Software Foundation  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

15 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-31618
NVD Published Date:
06/15/2021
NVD Last Modified:
11/21/2024
Source:
Apache Software Foundation