VDB-341610 · CVE-2025-62291 · Nessus 302046

strongSwan up to 6.0.2 eap-mschapv2 Plugin integer underflow

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.9	$0-$5k	0.00

Summaryinfo

A vulnerability labeled as critical has been found in strongSwan up to 6.0.2. Impacted is an unknown function of the component eap-mschapv2 Plugin. The manipulation results in integer underflow. This vulnerability is known as CVE-2025-62291. It is possible to launch the attack remotely. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in strongSwan up to 6.0.2. It has been classified as critical. Affected is an unknown part of the component eap-mschapv2 Plugin. The manipulation with an unknown input leads to a integer underflow vulnerability. CWE is classifying the issue as CWE-191. The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

In the eap-mschapv2 plugin (client-side) in strongSwan before 6.0.3, a malicious EAP-MSCHAPv2 server can send a crafted message of size 6 through 8, and cause an integer underflow that potentially results in a heap-based buffer overflow.

The advisory is available at github.com. This vulnerability is traded as CVE-2025-62291 since 10/10/2025. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available.

The vulnerability scanner Nessus provides a plugin with the ID 302046 (Fedora 44 : strongswan (2026-a1bc6c7e62)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.0.3 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (302046). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Network Encryption Software

Name

strongSwan

Version

License

open-source

Website

Product: https://github.com/strongswan/strongswan/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.1
VulDB Meta Temp Score: 7.9

VulDB Base Score: 8.1
VulDB Temp Score: 7.7
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.1
CNA Vector (MITRE): 🔒

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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

Exploitinginfo

Class: Integer underflow
CWE: CWE-191 / CWE-189
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 302046
Nessus Name: Fedora 44 : strongswan (2026-a1bc6c7e62)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: strongSwan 6.0.3

Timelineinfo

10/10/2025 CVE reserved
01/16/2026 +98 days Advisory disclosed
01/16/2026 +0 days VulDB entry created
03/13/2026 +56 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2025-62291 (🔒)
GCVE (CVE): GCVE-0-2025-62291
GCVE (VulDB): GCVE-100-341610

Entryinfo

Created: 01/16/2026 19:59
Updated: 03/13/2026 12:23
Changes: 01/16/2026 19:59 (63), 03/13/2026 12:23 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.