VULNERABILITY INTELLIGENCE
CVE-2021-44224
CVSS score8.2 HIGH
EPSS probability82.30%
CISA KEVNot currently listed
Published2021-12-20
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Description
A crafted URI sent to httpd configured as a forward proxy (ProxyRequests on) can cause a crash (NULL pointer dereference) or, for configurations mixing forward and reverse proxy declarations, can allow for requests to be directed to a declared Unix Domain Socket endpoint (Server Side Request Forgery). This issue affects Apache HTTP Server 2.4.7 up to 2.4.51 (included).
Weakness classification
- security@apache.org: CWE-476
- nvd@nist.gov: CWE-476
Primary references
- security@apache.org — Vendor Advisory
- security@apache.org — Mailing List, Third Party Advisory
- security@apache.org — Mailing List, Third Party Advisory
- security@apache.org — Mailing List, Third Party Advisory
- security@apache.org — Mailing List, Third Party Advisory
- security@apache.org
- security@apache.org
- security@apache.org
- security@apache.org
- security@apache.org — Third Party Advisory
- security@apache.org — Third Party Advisory
- security@apache.org — Third Party Advisory