Vulnerability detail
Enriched intelligence for a single CVE
Critical
CVE-2021-40438
PUBLISHEDmod_proxy SSRF
- Vendor
- Apache Software Foundation
- Product
- Apache HTTP Server
- Published
- Sep 16, 2021
- EPSS
- —
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.
CVSS scores
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Exploitation status
Exploited in the wild
Recorded 2021-12-01 00:00:00 UTC · Source
SSVC decision points
- Exploitation
- active
- Automatable
- No
- Technical impact
- total
References
- https://httpd.apache.org/security/vulnerabilities_24.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPBR6WUYBJNACHKE65SPL7TJOHX7RHWD/
- https://lists.apache.org/thread.html/r82838efc5fa6fc4c73986399c9b71573589f78b31846aff5bd9b1697%40%3Cusers.httpd.apache.org%3E
- https://lists.apache.org/thread.html/r82c077663f9759c7df5a6656f925b3ee4f55fcd33c889ba7cd687029%40%3Cusers.httpd.apache.org%3E
- https://lists.apache.org/thread.html/r3925e167d5eb1c75def3750c155d753064e1d34a143028bb32910432%40%3Cusers.httpd.apache.org%3E
- https://lists.apache.org/thread.html/r61fdbfc26ab170f4e6492ef3bd5197c20b862ce156e9d5a54d4b899c%40%3Cusers.httpd.apache.org%3E
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R/
- https://lists.debian.org/debian-lts-announce/2021/10/msg00001.html
- https://lists.apache.org/thread.html/r2eb200ac1340f69aa22af61ab34780c531d110437910cb9c0ece3b37%40%3Cbugs.httpd.apache.org%3E
- https://www.debian.org/security/2021/dsa-4982
- https://lists.apache.org/thread.html/r210807d0bb55f4aa6fbe1512be6bcc4dacd64e84940429fba329967a%40%3Cusers.httpd.apache.org%3E
- https://lists.apache.org/thread.html/rf6954e60b1c8e480678ce3d02f61b8a788997785652e9557a3265c00%40%3Cusers.httpd.apache.org%3E
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://www.tenable.com/security/tns-2021-17
- https://security.netapp.com/advisory/ntap-20211008-0004/
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf
- https://security.gentoo.org/glsa/202208-20
Known exploited vulnerability sources
Catalogues that list this CVE as a known exploited vulnerability.
| Source | Added |
|---|---|
| CISA | Dec 01, 2021 |
| CISA | Dec 01, 2021 |
Scanner integrations
| Scanner | Reference | Detected |
|---|---|---|
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-40438.yaml | Apr 25, 2025 |
Potential proof of concepts
These PoCs are unverified and could contain malware. Use at your own risk.
github · Created 2023-12-12 11:56:23 UTC · 7 stars
CVE-2021-40438 Apache <= 2.4.48 SSRF exploit
github · Created 2022-04-03 15:24:24 UTC · 17 stars
Apache forward request CVE
github · Created 2021-10-28 11:48:12 UTC · 2 stars
github · Created 2021-10-24 10:18:08 UTC · 12 stars
CVE-2021-40438 exploit PoC with Docker setup.
github · Created 2021-10-18 02:02:43 UTC · 4 stars
Timeline
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CVE ID Reserved
-
CVE Published to Public
-
Added to KEVIntel
-
Added to KEVIntel
-
Detected by Nuclei