CVE-2021-40438 · Severity: critical · CVSS 9 · Exploited in the wild · Published 2021-12-01
A Server-Side Request Forgery (SSRF) vulnerability in Apache HTTP Server's mod_proxy module allows a remote attacker to forward requests to an arbitrary origin server via a crafted request uri-path. This flaw can lead to unauthorized access to internal systems or data exfiltration.
Yes. CVE-2021-40438 is known to be exploited in the wild, first recorded on 1 December 2021. Treat it as urgent.
How severe is CVE-2021-40438?
Critical severity, with a CVSS score of 9, published 1 December 2021.
Which products and versions are affected?
Apache HTTP Server 2.4.48 and earlier.
Is there a fix for CVE-2021-40438?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2021-40438 attacked?
It is attacked over the network, in a web application.
Am I affected by CVE-2021-40438?
Check whether you run Apache. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Affected products
Apache HTTP Server 2.4.48 and earlier
Timeline
2021-12-01: disclosed
2021-12-01: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
2021-12-01: exploited: Confirmed exploited in the wild per CISA KEV catalog.