fetchmail up to 6.5.5 Authentication value delimiter

CVSS Meta Temp Score
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CTI Interest Score
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4.7$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in fetchmail up to 6.5.5. This vulnerability affects unknown code of the component Authentication Handler. The manipulation results in value delimiter. This vulnerability is known as CVE-2025-61962. It is possible to launch the attack remotely. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in fetchmail up to 6.5.5. Affected is some unknown functionality of the component Authentication Handler. The manipulation with an unknown input leads to a value delimiter vulnerability. CWE is classifying the issue as CWE-142. The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could be interpreted as value delimiters when they are sent to a downstream component. This is going to have an impact on availability. CVE summarizes:

In fetchmail before 6.5.6, the SMTP client can crash when authenticating upon receiving a 334 status code in a malformed context.

The advisory is shared for download at openwall.com. This vulnerability is traded as CVE-2025-61962 since 10/04/2025. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 269446 (Linux Distros Unpatched Vulnerability : CVE-2025-61962), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.5.6 eliminates this vulnerability. Applying the patch 4c3cebfa4e659fb778ca2cae0ccb3f69201609a8 is able to eliminate this problem. The bugfix is ready for download at gitlab.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (269446), EUVD (EUVD-2025-32416) and CERT Bund (WID-SEC-2025-2202). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Fedora Linux
  • Open Source fetchmail

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.7

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.9
CNA Vector (MITRE): 🔒

CVSSv2info

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

Exploitinginfo

Class: Value delimiter
CWE: CWE-142 / CWE-140 / CWE-20
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: 269446
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-61962

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: fetchmail 6.5.6
Patch: 4c3cebfa4e659fb778ca2cae0ccb3f69201609a8

Timelineinfo

10/04/2025 Advisory disclosed
10/04/2025 +0 days CVE reserved
10/04/2025 +0 days VulDB entry created
10/09/2025 +5 days VulDB entry last update

Sourcesinfo

Advisory: openwall.com
Status: Confirmed

CVE: CVE-2025-61962 (🔒)
GCVE (CVE): GCVE-0-2025-61962
GCVE (VulDB): GCVE-100-327000
EUVD: 🔒
CERT Bund: WID-SEC-2025-2202 - fetchmail: Schwachstelle ermöglicht Denial of Service

Entryinfo

Created: 10/04/2025 07:53
Updated: 10/09/2025 14:41
Changes: 10/04/2025 07:53 (64), 10/06/2025 13:39 (7), 10/06/2025 17:18 (1), 10/08/2025 19:51 (2), 10/09/2025 14:41 (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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