CVE-2021-40438
mod_proxy SSRF
- State
- Published
- Severity
- 9.0 Critical
- Published
- Sep 16, 2021
- Updated
- Aug 6, 2026
- Reserved
- Sep 2, 2021
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
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 9.0 Critical | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H | CISA-ADP |
Weaknesses
- CWE-918 Server Side Request Forgery (SSRF)
Affected Products
| Product | Versions |
|---|---|
Apache HTTP ServerApache Software Foundation |
|
References
- https://httpd.apache.org/security/vulnerabilities_24.html
- FEDORA-2021-dce7e7738evendor-advisory
- [httpd-users] 20210923 [users@httpd] 2.4.49 security fixes: more infomailing-list
- [httpd-users] 20210923 Re: [users@httpd] 2.4.49 security fixes: more infomailing-list
- [httpd-users] 20210923 [users@httpd] Re: [External] : [users@httpd] 2.4.49 security fixes: more infomailing-list
- [httpd-users] 20210923 Re: [users@httpd] Re: [External] : [users@httpd] 2.4.49 security fixes: more infomailing-list
- FEDORA-2021-e3f6dd670dvendor-advisory
- [debian-lts-announce] 20211002 [SECURITY] [DLA 2776-1] apache2 security updatemailing-list
- [httpd-bugs] 20211008 [Bug 65616] CVE-2021-36160 regressionmailing-list
- DSA-4982vendor-advisory
- [httpd-users] 20211019 [users@httpd] Regarding CVE-2021-40438mailing-list
- [httpd-users] 20211019 Re: [users@httpd] Regarding CVE-2021-40438mailing-list
- 20211124 Multiple Vulnerabilities in Apache HTTP Server Affecting Cisco Products: November 2021vendor-advisory
- 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
- GLSA-202208-20vendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-40438government-resource
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