strongSwan: Schwachstelle ermöglicht Denial of Service
A vulnerability in strongSwan's handling of EAP-TTLS AVPs when using the eap-ttls plugin can cause the software to consume excessive resources or crash, leading to a denial of service (DoS). This issue affects multiple Linux distributions including Debian and Fedora. The vulnerability was discovered by Kazuma Matsumoto and is tracked as CVE-2026-25075. Ubuntu has released patches for affected versions to address this issue.
AI Analysis
Technical Summary
strongSwan, an IPSec-based VPN implementation, contains a vulnerability in the eap-ttls plugin where it incorrectly processes EAP-TTLS Attribute-Value Pairs (AVPs). This flaw can be exploited by an attacker sending specially crafted network traffic to cause resource exhaustion or crash the strongSwan service, resulting in denial of service. The issue affects multiple Linux distributions including Debian and Fedora. Ubuntu has published security notices with fixed package versions to remediate the vulnerability.
Potential Impact
An attacker can trigger a denial of service condition by sending specially crafted network traffic to a vulnerable strongSwan instance using the eap-ttls plugin. This causes the service to consume excessive resources or crash, disrupting VPN connectivity and potentially impacting availability of services relying on strongSwan.
Mitigation Recommendations
A fix is available. Ubuntu has released updated strongSwan packages for versions 25.10, 24.04 LTS, and 22.04 LTS that address this vulnerability. Users should apply standard system updates to install these patches. For other affected distributions such as Debian and Fedora, users should monitor vendor advisories for corresponding updates and apply them promptly.
strongSwan: Schwachstelle ermöglicht Denial of Service
Description
A vulnerability in strongSwan's handling of EAP-TTLS AVPs when using the eap-ttls plugin can cause the software to consume excessive resources or crash, leading to a denial of service (DoS). This issue affects multiple Linux distributions including Debian and Fedora. The vulnerability was discovered by Kazuma Matsumoto and is tracked as CVE-2026-25075. Ubuntu has released patches for affected versions to address this issue.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
strongSwan, an IPSec-based VPN implementation, contains a vulnerability in the eap-ttls plugin where it incorrectly processes EAP-TTLS Attribute-Value Pairs (AVPs). This flaw can be exploited by an attacker sending specially crafted network traffic to cause resource exhaustion or crash the strongSwan service, resulting in denial of service. The issue affects multiple Linux distributions including Debian and Fedora. Ubuntu has published security notices with fixed package versions to remediate the vulnerability.
Potential Impact
An attacker can trigger a denial of service condition by sending specially crafted network traffic to a vulnerable strongSwan instance using the eap-ttls plugin. This causes the service to consume excessive resources or crash, disrupting VPN connectivity and potentially impacting availability of services relying on strongSwan.
Mitigation Recommendations
A fix is available. Ubuntu has released updated strongSwan packages for versions 25.10, 24.04 LTS, and 22.04 LTS that address this vulnerability. Users should apply standard system updates to install these patches. For other affected distributions such as Debian and Fedora, users should monitor vendor advisories for corresponding updates and apply them promptly.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_base
- Csaf Version
- 2.0
- Publisher
- Bundesamt für Sicherheit in der Informationstechnik
- Advisory Id
- WID-SEC-W-2026-0825
- Cve Count
- 1
- Additional Cves
- []
- Cvss Version
- null
Threat ID: 6a18abb3e29bf47b5028b4a1
Added to database: 5/28/2026, 8:55:15 PM
Last enriched: 5/28/2026, 9:23:10 PM
Last updated: 5/28/2026, 10:10:58 PM
Views: 3
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