Timing Attack Vulnerability in Apache HTTP Server Affects Digest Authentication
CVE-2026-33006

4.8MEDIUM

Key Information:

Vendor

Apache
Status
Apache Http Server
Vendor
CVE Published:
4 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-33006?

A vulnerability in Apache HTTP Server 2.4.66 allows remote attackers to bypass Digest authentication through a timing attack on the mod_auth_digest module. This flaw can lead to unauthorized access to sensitive resources, posing significant risks to server integrity and confidentiality. To mitigate these risks, users are strongly encouraged to upgrade to version 2.4.67, which patches this security issue.

Affected Version(s)

Apache HTTP Server 0 <= 2.4.66

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CTT-enhanced-Apache-mod_auth_digest-timing-attack-exploit
Created by SimoesCTT

References

https://httpd.apache.org/security/vulnerabilities_24.html
vendor-advisory

CVSS V3.1

Score:
4.8
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Nitescu Lucian
.