VULNERABILITY INTELLIGENCE
CVE-2021-33193
CVSS score7.5 HIGH
EPSS probability46.18%
CISA KEVNot currently listed
Published2021-08-16
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Description
A crafted method sent through HTTP/2 will bypass validation and be forwarded by mod_proxy, which can lead to request splitting or cache poisoning. This issue affects Apache HTTP Server 2.4.17 to 2.4.48.
Primary references
- security@apache.org — Patch
- security@apache.org — Patch
- security@apache.org — Patch
- security@apache.org — Mailing List, Third Party Advisory
- security@apache.org — Third Party Advisory
- security@apache.org — Third Party Advisory
- security@apache.org — Exploit, Third Party Advisory
- security@apache.org — Third Party Advisory
- security@apache.org — Third Party Advisory
- security@apache.org — Third Party Advisory
- security@apache.org — Patch, Third Party Advisory
- security@apache.org — Patch, Third Party Advisory