CVE-2022-26377: mod_proxy_ajp: Possible request smuggling

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 21.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-06-09 · updated 2026-06-17
Weakness: CWE-444

Description

Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling') vulnerability in mod_proxy_ajp of Apache HTTP Server allows an attacker to smuggle requests to the AJP server it forwards requests to. This issue affects Apache HTTP Server Apache HTTP Server 2.4 version 2.4.53 and prior versions.

Affected products

Apache HTTP Server: from 2.4.0 before 2.4.54 — fixed in 2.4.54
Fedoraproject Fedora: 35, 36
Clustered Data ONTAP: all versions

How to fix

Upgrade to a fixed version: Apache HTTP Server 2.4.54. Check the vendor advisory for mitigations.

References

http://www.openwall.com/lists/oss-security/2022/06/08/2
https://httpd.apache.org/security/vulnerabilities_24.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7QUGG2QZWHTITMABFLVXA4DNYUOTPWYQ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YPY2BLEVJWFH34AX77ZJPLD2OOBYR6ND/
https://security.gentoo.org/glsa/202208-20
https://security.netapp.com/advisory/ntap-20220624-0005/
http://www.openwall.com/lists/oss-security/2022/06/08/2
https://httpd.apache.org/security/vulnerabilities_24.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7QUGG2QZWHTITMABFLVXA4DNYUOTPWYQ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YPY2BLEVJWFH34AX77ZJPLD2OOBYR6ND/
https://security.gentoo.org/glsa/202208-20
https://security.netapp.com/advisory/ntap-20220624-0005/

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