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[ CVE-2021-40438 · Published 16 Sep 2021 ]

Apache HTTP Server-Side Request Forgery (SSRF)

Exploited · CISA KEV CVSS 9.0 EPSS 100%Fix available

[ Why it matters ]Priority signals

  • Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2021-12-01
  • Known to be used in ransomware campaigns
  • EPSS: 100% chance of exploitation in the next 30 days (higher than 100% of CVEs)
  • Critical severity: CVSS 9.0

[ Description ]Official description

A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen by the remote user. This issue affects Apache HTTP Server 2.4.48 and earlier.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 15 Dec 2021): Apply updates per vendor instructions.

[ References ]References