Apache HTTP Server up to 2.4.66 mod_authn_socache null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.00

Summaryinfo

A vulnerability was found in Apache HTTP Server up to 2.4.66. It has been declared as problematic. This vulnerability affects unknown code of the component mod_authn_socache. Such manipulation leads to null pointer dereference. This vulnerability is listed as CVE-2026-33007. The attack may be performed from remote. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Apache HTTP Server up to 2.4.66 and classified as problematic. Affected by this issue is some unknown processing of the component mod_authn_socache. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. CVE summarizes:

A NULL pointer dereference in the mod_authn_socache in Apache HTTP Server 2.4.66 and earlier allows an unauthenticated remote user to crash a child process in a caching forward proxy configuration. Users are recommended to upgrade to version 2.4.67, which fixes this issue.

The weakness was presented by Pavel Kohout. The advisory is shared for download at httpd.apache.org. This vulnerability is handled as CVE-2026-33007 since 03/17/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 05/13/2026).

The vulnerability scanner Nessus provides a plugin with the ID 312249 (FreeBSD : www/apache24 -- Multiple vulnerabilities (1ccc383b-486a-11f1-8b62-8447094a420f)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.4.67 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (312249), EUVD (EUVD-2026-26963) and CERT Bund (WID-SEC-2026-1354). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Debian Linux
  • Red Hat Enterprise Linux
  • Fedora Linux
  • Ubuntu Linux
  • IBM HTTP Server
  • Microsoft Azure Linux
  • Apache HTTP Server

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 312249
Nessus Name: FreeBSD : www/apache24 -- Multiple vulnerabilities (1ccc383b-486a-11f1-8b62-8447094a420f)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: HTTP Server 2.4.67

Timelineinfo

03/17/2026 CVE reserved
05/04/2026 +47 days Advisory disclosed
05/04/2026 +0 days VulDB entry created
05/13/2026 +9 days VulDB entry last update

Sourcesinfo

Vendor: apache.org

Advisory: httpd.apache.org
Researcher: Pavel Kohout
Status: Confirmed

CVE: CVE-2026-33007 (🔒)
GCVE (CVE): GCVE-0-2026-33007
GCVE (VulDB): GCVE-100-360968
EUVD: 🔒
CERT Bund: WID-SEC-2026-1354 - Apache HTTP Server: Mehrere Schwachstellen

Entryinfo

Created: 05/04/2026 17:22
Updated: 05/13/2026 12:13
Changes: 05/04/2026 17:22 (57), 05/04/2026 19:52 (1), 05/05/2026 12:16 (7), 05/06/2026 04:31 (2), 05/13/2026 12:13 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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