Apache HTTP Server-Side Request Forgery (SSRF) (CVE-2021-40438)
Severity: critical · Patch status: patched · Since 2021-12-01 · CVE-2021-40438
A crafted request uri-path can cause modproxy to forward the request to an origin server choosen by the remote user. This issue affects Apache HTTP Server 2.4.48 and earlier. CISA added CVE-2021-40438 to its Known Exploited Vulnerabilities catalog on Dec 1, 2021, which means attackers are exploiting it in the wild. CISA reports known use in ransomware campaigns.
What to do
- Apply updates per vendor instructions.
- US federal agencies must remediate by Dec 15, 2021 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch
