CVE-2021-40438
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CVSS Score
V3.1EPSS Score
v2025.03.14There is a 94.4% chance that this vulnerability will be exploited in the wild within the next 30 days.
Attack Vector Metrics
Impact Metrics
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.
Available Exploits
Apache <= 2.4.48 Mod_Proxy - Server-Side Request Forgery
Apache 2.4.48 and below contain an issue where uri-path can cause mod_proxy to forward the request to an origin server chosen by the remote user.
References:
- https://firzen.de/building-a-poc-for-cve-2021-40438
- https://httpd.apache.org/security/vulnerabilities_24.html
- https://nvd.nist.gov/vuln/detail/CVE-2021-40438
- https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf
- https://lists.apache.org/thread.html/r210807d0bb55f4aa6fbe1512be6bcc4dacd64e84940429fba329967a@%3Cusers.httpd.apache.org%3E
Related News
Affected Products
Affected Versions:
Known Exploited Vulnerability
This vulnerability is actively being exploited in the wild
Remediation Status
Due Date
Added to KEV
Required Action
Apply updates per vendor instructions.
Affected Product
Ransomware Risk
GitHub Security Advisories
Community-driven vulnerability intelligence from GitHub
Advisory Details
CVSS Scoring
CVSS Score
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
References
Advisory provided by GitHub Security Advisory Database. Published: May 24, 2022, Modified: July 24, 2024