CVE-2021-40438 (GCVE-0-2021-40438)

Vulnerability from cvelistv5 – Published: 2021-09-16 14:40 – Updated: 2025-10-21 23:25
VLAI CISA KEV
Title
mod_proxy SSRF
Summary
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.
Severity
No CVSS data available.
CWE
  • CWE-918 - Server Side Request Forgery (SSRF)
Assigner
References
URL Tags
https://httpd.apache.org/security/vulnerabilities… x_refsource_MISC
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
https://lists.apache.org/thread.html/r82838efc5fa… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r82c077663f9… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r3925e167d5e… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r61fdbfc26ab… mailing-listx_refsource_MLIST
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
https://lists.debian.org/debian-lts-announce/2021… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r2eb200ac134… mailing-listx_refsource_MLIST
https://www.debian.org/security/2021/dsa-4982 vendor-advisoryx_refsource_DEBIAN
https://lists.apache.org/thread.html/r210807d0bb5… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rf6954e60b1c… mailing-listx_refsource_MLIST
https://tools.cisco.com/security/center/content/C… vendor-advisoryx_refsource_CISCO
https://www.oracle.com/security-alerts/cpujan2022.html x_refsource_MISC
https://www.tenable.com/security/tns-2021-17 x_refsource_CONFIRM
https://security.netapp.com/advisory/ntap-2021100… x_refsource_CONFIRM
https://www.oracle.com/security-alerts/cpuapr2022.html x_refsource_MISC
https://cert-portal.siemens.com/productcert/pdf/s… x_refsource_CONFIRM
https://security.gentoo.org/glsa/202208-20 vendor-advisoryx_refsource_GENTOO
Impacted products
Vendor Product Version
Apache Software Foundation Apache HTTP Server Affected: Apache HTTP Server 2.4 , ≤ 2.4.48 (custom)
Create a notification for this product.
Credits
The issue was discovered by the Apache HTTP security team while analysing CVE-2021-36160
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 95af384b-7aba-4d32-b24f-c51a8b507e7c

Vulnerability ID: CVE-2021-40438

Status: Confirmed

Status Updated: 2021-12-01 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2021-12-01
Asserted: 2021-12-01
Scope
Notes: KEV entry: Apache HTTP Server-Side Request Forgery (SSRF) | Affected: Apache / Apache | 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. | Required action: Apply updates per vendor instructions. | Due date: 2021-12-15 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2021-40438
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-918
Feed CISA Known Exploited Vulnerabilities Catalog
Product Apache
Due Date 2021-12-15
Date Added 2021-12-01
Vendorproject Apache
Vulnerabilityname Apache HTTP Server-Side Request Forgery (SSRF)
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 13:26 UTC | Updated: 2026-02-06 07:53 UTC
Show details on NVD website
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}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.