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CVE-2026-33523 | Mondoo Vulnerability Intelligence

Vulnerability IntelligenceCVE-2026-33523

CVE-2026-33523

MEDIUM6.5

Apache HTTP Server: multiple modules: HTTP response splitting forwarding malicious status line

Published May 4, 2026

Modified 3 weeks ago

Details

HTTP response splitting vulnerability in multiple Apache HTTP Server modules with untrusted or compromised backend servers.

This issue affects Apache HTTP Server: from through 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.

References

http://www.openwall.com/lists/oss-security/2026/05/04/23

https://httpd.apache.org/security/vulnerabilities_24.html

https://www.cve.org/CVERecord?id=CVE-2026-33523

CVSS Analysis

CVSS v3.1

6.5

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Privileges Required

NonePR:N

User Interaction

NoneUI:N

Scope

Scope

UnchangedS:U

Impact

Confidentiality

LowC:L

Integrity

LowI:L

Availability

NoneA:N

6.5/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Weakness Type (CWE)

Other

Ecosystems

Timeline

PublishedMay 4, 2026

ModifiedMay 4, 2026