Bug 2430429 (CVE-2025-62291)

Summary: CVE-2025-62291 strongswan: strongSwan: Arbitrary Code Execution and Denial of Service via crafted EAP-MSCHAPv2 message
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the strongSwan eap-mschapv2 plugin (client-side). A remote attacker, specifically a malicious Extensible Authentication Protocol - Microsoft Challenge-Handshake Authentication Protocol version 2 (EAP-MSCHAPv2) server, could exploit this by sending a specially crafted message between 6 and 8 bytes in size. This crafted message can cause an integer underflow, leading to a heap-based buffer overflow. This vulnerability could potentially result in arbitrary code execution, allowing the attacker to take control of the affected system, or lead to a denial of service.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2430433, 2430434, 2430435, 2430437, 2430432, 2430436    
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Description OSIDB Bzimport 2026-01-16 19:01:55 UTC 
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.