CVE-2021-40438: Apache HTTP Server-Side Request Forgery (SSRF)
This Apache advisory covers CVE-2021-40438 in Apache HTTP Server.
- CVE-2021-40438
Key facts
- CISA KEV
- Listed ; federal due date ; ransomware use known to CISA
- Affected
- Apache HTTP Server Apache HTTP Server 2.4 through 2.4.48
- Source published
- Source revised
- Listed by VulniPulse
- Record changed
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
CVE-2021-40438 in the CISA Known Exploited Vulnerabilities catalog
- CISA name:
- Apache HTTP Server-Side Request Forgery (SSRF)
- CISA 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.
- Required action:
- Apply updates per vendor instructions.
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.
Text from the source record.
- Apache HTTP Server Apache HTTP Server 2.4 through 2.4.48
Official advisory · medium-confidence parse· fetched ·verify at source
End-of-life dates for Apache HTTP Server
More Apache Software Foundation advisories
CVE-2026-63686Oct 1, 2026NULL pointer dereference in mod_xml2enc in Apache Software Foundation Apache HTTP ServerCVE-2026-73637Oct 1, 2026Use after free in mod_auth_digest in Apache Software Foundation Apache HTTP ServerCVE-2026-73636Oct 1, 2026Authentication bypass by capture-replay in mod_auth_digest in Apache Software FoundationCVE-2026-63292Oct 1, 2026Stack-based buffer overflow in mod_vhost_alias in Apache Software Foundation Apache HTTPCVE-2026-63045Oct 1, 2026Improper validation of FTP PASV reply address in mod_proxy_ftp in Apache SoftwareCVE-2026-48005Oct 1, 2026Apache HTTP Server authentication bypass
Apache Software Foundation advisories, September 2021All Apache Software Foundation advisories
Get an email when Apache HTTP Server (httpd) publishes the next one.
See Apache HTTP Server (httpd)'s last 90 days of advisories first. Then choose one product with live alerts free for life, or a free month of real-time alerts on everything with the severity, the fixed version and the vendor's link (card needed, then US$15/month; we email you before the first charge).
iPhone and Android apps · New on the App Store
Monitor future Apache Software Foundation CVEs from your phone.
Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 34 official vendor sources and 160+ reviewed platform categories.
