Apache HTTP Server up to 2.4.65 Environment Variable control sequence

Summaryinfo

A vulnerability identified as problematic has been detected in Apache HTTP Server up to 2.4.65. Impacted is an unknown function of the component Environment Variable Handler. This manipulation causes control sequence. This vulnerability appears as CVE-2025-65082. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in Apache HTTP Server up to 2.4.65 and classified as problematic. Affected by this vulnerability is some unknown functionality of the component Environment Variable Handler. The manipulation with an unknown input leads to a control sequence vulnerability. The CWE definition for the vulnerability is CWE-150. The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could be interpreted as escape, meta, or control character sequences when they are sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Improper Neutralization of Escape, Meta, or Control Sequences vulnerability in Apache HTTP Server through environment variables set via the Apache configuration unexpectedly superseding variables calculated by the server for CGI programs. This issue affects Apache HTTP Server from 2.4.0 through 2.4.65. Users are recommended to upgrade to version 2.4.66 which fixes the issue.

The advisory is shared at lists.apache.org. This vulnerability is known as CVE-2025-65082. The exploitation appears to be easy. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 02/04/2026).

The vulnerability scanner Nessus provides a plugin with the ID 277491 (Linux Distros Unpatched Vulnerability : CVE-2025-65082), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.4.66 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (277491) and CERT Bund (WID-SEC-2025-2750). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

• Debian Linux
• Amazon Linux 2
• Red Hat Enterprise Linux
• Fedora Linux
• Ubuntu Linux
• IBM HTTP Server
• SUSE Linux
• IBM Rational ClearCase
• Oracle Linux
• HCL Commerce
• SUSE openSUSE
• RESF Rocky Linux
• IBM Business Automation Workflow
• Apache HTTP Server
• Microsoft Azure Linux

Productinfo

Type

• Web Server

Vendor

• Apache

Name

• HTTP Server

Version

• 2.4.0
• 2.4.1
• 2.4.2
• 2.4.3
• 2.4.4
• 2.4.5
• 2.4.6
• 2.4.7
• 2.4.8
• 2.4.9
• 2.4.10
• 2.4.11
• 2.4.12
• 2.4.13
• 2.4.14
• 2.4.15
• 2.4.16
• 2.4.17
• 2.4.18
• 2.4.19
• 2.4.20
• 2.4.21
• 2.4.22
• 2.4.23
• 2.4.24
• 2.4.25
• 2.4.26
• 2.4.27
• 2.4.28
• 2.4.29
• 2.4.30
• 2.4.31
• 2.4.32
• 2.4.33
• 2.4.34
• 2.4.35
• 2.4.36
• 2.4.37
• 2.4.38
• 2.4.39
• 2.4.40
• 2.4.41
• 2.4.42
• 2.4.43
• 2.4.44
• 2.4.45
• 2.4.46
• 2.4.47
• 2.4.48
• 2.4.49
• 2.4.50
• 2.4.51
• 2.4.52
• 2.4.53
• 2.4.54
• 2.4.55
• 2.4.56
• 2.4.57
• 2.4.58
• 2.4.59
• 2.4.60
• 2.4.61
• 2.4.62
• 2.4.63
• 2.4.64
• 2.4.65

License

• open-source

Website

• Vendor: https://www.apache.org/

CPE 2.3info

• 🔒
• 🔒
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CPE 2.2info

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CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion