Apache HTTP Server-Side Request Forgery (SSRF)

High Listed in CISA KEV

CVECVE-2021-40438

First seen2021-12-01 00:00 UTC

Disclosed2021-12-01 00:00 UTC

Last updated2026-07-18 01:45 UTC

Channel statuspending_review

Summary

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.

In-depth triage · Auto channel

No in-depth report has been generated yet (DR-003 v2 AI pipeline is under construction).

Affected products

Apache:Apache

Sources

CISA KEV DATABASE

Original Links

https://nvd.nist.gov/vuln/detail/CVE-2021-40438 advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog kev

Timeline

2021-12-01 kev_added CISA KEV
2026-07-18 kev_ingest CISA KEV