CVE-2021-40438

mod_proxy SSRF

Basic Information

CVE State: PUBLISHED
Reserved Date: September 02, 2021
Published Date: September 16, 2021
Last Updated: February 06, 2025
Vendor: Apache Software Foundation
Product: Apache HTTP Server
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

SSVC Information

Exploitation: active
Technical Impact: total

Exploit Status

Exploited in the Wild: Yes (added 2021-12-01 00:00:00 UTC) Source
Proof of Concept Available: Yes (added 2021-10-28 11:48:12 UTC) Source

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 Information

Source	Added Date
CISA	2021-12-01 00:00:00 UTC

Scanner Integrations

Scanner	URL	Date Detected
Nuclei	https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-40438.yaml	2025-04-26 00:00:00 UTC

Potential Proof of Concepts

Warning: These PoCs have not been tested and could contain malware. Use at your own risk.

sergiovks/CVE-2021-40438-Apache-2.4.48-SSRF-exploit

Type: github • Created: 2023-12-12 11:56:23 UTC • Stars: 7

CVE-2021-40438 Apache <= 2.4.48 SSRF exploit

Kashkovsky/CVE-2021-40438

Type: github • Created: 2022-04-03 15:24:24 UTC • Stars: 17

Apache forward request CVE

BabyTeam1024/CVE-2021-40438

Type: github • Created: 2021-10-28 11:48:12 UTC • Stars: 2

sixpacksecurity/CVE-2021-40438

Type: github • Created: 2021-10-24 10:18:08 UTC • Stars: 12

CVE-2021-40438 exploit PoC with Docker setup.

xiaojiangxl/CVE-2021-40438

Type: github • Created: 2021-10-18 02:02:43 UTC • Stars: 4