CVE-2026-33523

MEDIUM
MEDIUM Priority: 0.03 BB Relevance: 73/100
Published: 2026-05-04 Modified: 2026-10-26 First seen: 2026-10-29 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
S: Unchanged
C: Low
I: Low
A: None

Description

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.

Weakness Classification (1)

Affected Software (1)

VendorProductVersion
apache http_server 2.4.0 – 2.4.67

References & Advisories (2)

Bug Bounty Relevance

73 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

6.5 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS — Exploitation Probability

0.44%
Raw Score 0.004360
Percentile 37.8%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00436
2026-10-28
0.00436

Intelligence Sources

nvd ref →