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CISA KEV · Known exploitedCritical

CVE-2021-40438

Apache Software Foundation Apache HTTP Server, rocky linux, enterprise linux

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
9
EPSS
100.0%
100.0% percentile
CISA KEV
Listed
Published
2021.09.17
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability100.0%
Technical severityCVSS 9

Vulnerability overview

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.

Affected product and versions

Product
Apache Software Foundation Apache HTTP Server, rocky linux, enterprise linux
Affected versions
>= Apache HTTP Server 2.4 <= 2.4.48, 8.0, 8.1, 8.2, 8.4, 8.6, 8.8, 7.0 s390x, 7.0, 7.2, 7.3, 7.4, 7.6, 7.7, 1.0, <= 2.4.48, 34, 35, 9.0, 10.0
Fixed versions
1.0.3, 3.1

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA required action

Apply updates per vendor instructions.

Due date: 2021.12.15
  1. 1
    Identify

    Confirm that Apache Software Foundation Apache HTTP Server, rocky linux, enterprise linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
CWE
CWE-918
KEV added
2021.12.01
Ransomware use
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CVE-2021-40438 — Apache Software Foundation Apache HTTP Server, rocky linux, enterprise linux | SECUFOCUS NOW