8.1

CVE-2025-62291: strongswan Integer Underflow (Wrap or Wraparound)

Deferred
AliasesALPINE-CVE-2025-62291MGASA-2025-0272SUSE-SU-2025:21167-1
Published 16-01-2026Last modified 16-01-2026

Vulnerability summary

CVE-2025-62291 is a high (CVSS 8.1) Integer Underflow (Wrap or Wraparound) vulnerability in strongswan. EPSS estimates a 0.98% chance of exploitation in the next 30 days, higher than 62.4% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 8.1 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 04-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
8.1/10
010
High · v3.1 (CVE.org)
EPSS score
0.98%
0%100%
Low · -0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 16-01-2026
    PublishedVulnerability first disclosed.
  2. 16-01-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.98%

Chance of exploitation in the next 30 days

Percentile

62%

Versus all other CVEs

30-day change

Decrease -0.01 pp

From 1.00% on 05-10-2026

05-10-202604-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Suse24 products
  • strongswan&distro=SUSE Enterprise Storage 7.1< 5.8.2-150200.11.45.1
  • strongswan&distro=SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS< 5.8.2-150200.11.45.1
  • strongswan&distro=SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS< 5.9.11-150400.19.20.1
  • strongswan&distro=SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS< 5.9.11-150400.19.20.1
  • strongswan&distro=SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS< 5.9.11-150500.5.9.1
Opensuse3 products
  • strongswan&distro=openSUSE Leap 15.6< 5.9.12-150600.3.5.2
  • strongswan&distro=openSUSE Leap 16.0< 6.0.1-160000.3.1
  • strongswan&distro=openSUSE Tumbleweed< 6.0.3-1.1
Alpine1 product
  • strongswan< 5.9.13-r2 | < 5.9.14-r1 | < 5.9.14-r3
Debian1 product
  • strongswan< 6.0.3-1 | < 5.9.8-5+deb12u2 | < 6.0.1-6+deb13u2 | < 5.9.1-1+deb11u5
Mageia1 product
  • strongswan< 5.9.14-1.1.mga9
Strongswan1 product
Ubuntu1 product
  • strongswanAll versions (No fix recorded) | < 5.9.5-2ubuntu2.4+Fips1 | < 6.0.1-6ubuntu5 | < 5.9.5-2ubuntu2.4 | < 5.9.13-2ubuntu4.24.04.1 | < 6.0.1-6ubuntu4.1

7 vendors · 32 products

References

23 links
Show all 23 references