CVE-2021-40438
mod_proxy SSRF
9.0
CRITICAL
CVSS 3.1
⚠ KEVEPSS 94.4%
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.
How to fix CVE-2021-40438
To remediate CVE-2021-40438, upgrade the affected package to a fixed version below.
- Alpine/apache2—upgrade to 2.4.49-r0 or later
- —upgrade to 2.4.49 or later
- —upgrade to 2.4.51-1~deb11u1 or later
Is CVE-2021-40438 being exploited?
Yes — CVE-2021-40438 is on the CISA Known Exploited Vulnerabilities (KEV) catalog. Patch immediately.
Affected packages (3)
- from 0, < 2.4.49-r0
- from 0, < 2.4.49
- from 0, < 2.4.51-1~deb11u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.0 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H |