CVE-2021-40438CISA KEVEPSS p100.0%

CVE-2021-40438Apache HTTP Server-Side Request Forgery (SSRF)

Apache / Apache

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.

Scoring

CVSS 9.0 ()
VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS100.00% probability of exploitation · percentile 100.0% · 2026-07-24T12:03:22Z
Last modified2026-08-01

CISA KEV entry

Added to KEV: 2021-12-01

(incoming)1

TypeTargetConfidenceTier
KEVEntryApache HTTP Server-Side Request Forgery (SSRF)kev-cve-2021-404380%live

Related by meaning· 6

Nearest entities by semantic similarity across the cs-graph corpus.

CVE
CVE-2026-34355
CVE
CVE-2025-52362
CVE
CVE-2026-34356
CVE
CVE-2025-2691
CVE
Apache HTTP Server Improper Escaping of Output Vulnerability
CWE
Server-Side Request Forgery (SSRF)
Sourced from NVD + CISA KEV + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.