Vigie VulnEuropean-hosted Vulnerability DB

CVE-2021-40438

mod_proxy SSRF

At a glance

Severity
CRITICAL 9.0
Exploitation
Known exploited (CISA KEV) · added 2021-12-01
Exploited per ENISA since 2021-12-01
EPSS
EPSS 100.00 % · percentile 100 (2026-10-27)
State
PUBLISHED
Published
Updated
Assigner
apache
NVD status
Analyzed

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.

Scores

VersionScoreVectorScored by
CVSS 3.1CRITICAL 9.0CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:HCISA-ADP
CVSS 3.1CRITICAL 9.0CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:HNVD · nvd@nist.gov (Primary)
CVSS 3.1CRITICAL 9.0CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:HNVD · 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)
CVSS 2.0MEDIUM 6.8AV:N/AC:M/Au:N/C:P/I:P/A:PNVD · nvd@nist.gov (Primary)

Weaknesses (CWE)

European references

CERT-FR advisories

Affected configurations (NVD CPE)

Affected products

ProductVersions
Apache Software Foundation · Apache HTTP Serveraffected Apache HTTP Server 2.4 ≤ 2.4.48

References

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
CISA Known Exploited VulnerabilitiesCC0 1.0
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD