Cyber Resilience

CVE-2026-33857

Medium

Published: 04 May 2026

Published
04 May 2026
Modified
04 May 2026
KEV Added
—
Patch
—
CVSS Score v3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS Score 0.0025 48.3th percentile
Risk Priority 11 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-33857 is a medium-severity Out-of-bounds Read (CWE-125) vulnerability in Apache Http Server. Its CVSS base score is 5.3 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 48.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

Out-of-bounds Read vulnerability in mod_proxy_ajp of Apache HTTP Server. This issue affects Apache HTTP Server: through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

CWE(s)
CWE-125

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
Why these techniques?

Out-of-bounds read in public-facing Apache mod_proxy_ajp directly enables exploitation of an Internet-facing web server application for initial access.

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

Affected Assets

apache
http server
≤ 2.4.67

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References