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No exploitation reportedFix available

CVE-2025-62291

No exploitation reported by the sources we read.

  • Published2026-01-16
  • WeaknessCWE-191

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2026-01-1619:16CVE publishedNVD

Versions per branch

Products declared by the CNA1 product

As mitre, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • strongSwanother versions: not affected
    Affected
    • ≥ 4.2.12, < 6.0.3fixed in 6.0.3semver

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-01-16

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • strongswanUbuntu:Pro:FIPS:20.04:LTSall versions · no fixed version listed
  • strongswanUbuntu:Pro:FIPS:18.04:LTSall versions · no fixed version listed
  • strongswanUbuntu:Pro:FIPS:16.04:LTSall versions · no fixed version listed
  • strongswanUbuntu:Pro:FIPS-updates:22.04:LTSall versions · fixed in 5.9.5-2ubuntu2.4+Fips1
  • strongswanUbuntu:Pro:FIPS-updates:20.04:LTSall versions · no fixed version listed
  • strongswanUbuntu:Pro:FIPS-updates:18.04:LTSall versions · no fixed version listed
  • strongswanUbuntu:Pro:FIPS-updates:16.04:LTSall versions · no fixed version listed
  • strongswanUbuntu:Pro:FIPS-preview:22.04:LTSall versions · no fixed version listed

49 more package ranges on OSV.dev

Vendor advisories

  • CVE-2025-62291 Red Hat Product Security

    strongswan: strongSwan: Arbitrary Code Execution and Denial of Service via crafted EAP-MSCHAPv2 message

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2026-01-16
Last Modified
2026-06-17
NVD status
Deferred
GitHub Advisory
GHSA-p527-wjvq-vxg8

Frequently asked questions

What is CVE-2025-62291?

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.

Is CVE-2025-62291 actively exploited?

Active exploitation of CVE-2025-62291 has not been confirmed. Its EPSS score was 1.0% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-62291?

CVE-2025-62291 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record