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.
Published 2021-09-16 15:15:08
Updated 2022-10-05 02:21:30
View at NVD,   CVE.org
Vulnerability category: Server-side request forgery (SSRF)

Threat overview for CVE-2021-40438

Top countries where our scanners detected CVE-2021-40438
Top open port discovered on systems with this issue 80
IPs affected by CVE-2021-40438 8,137,230
Threat actors abusing to this issue? Yes
Find out if you* are affected by CVE-2021-40438!
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CVE-2021-40438 is in the CISA Known Exploited Vulnerabilities Catalog

CISA vulnerability name:
Apache HTTP Server-Side Request Forgery (SSRF)
CISA required action:
Apply updates per vendor instructions.
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.
Added on 2021-12-01 Action due date 2021-12-15

Exploit prediction scoring system (EPSS) score for CVE-2021-40438

Probability of exploitation activity in the next 30 days: 97.45%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 100 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2021-40438

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source
6.8
MEDIUM AV:N/AC:M/Au:N/C:P/I:P/A:P
8.6
6.4
NIST
9.0
CRITICAL CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
2.2
6.0
NIST

CWE ids for CVE-2021-40438

  • The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.
    Assigned by:
    • nvd@nist.gov (Primary)
    • security@apache.org (Secondary)

References for CVE-2021-40438

Products affected by CVE-2021-40438

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