EUVD-2026-31435
GHSA-rvw7-wx4g-rq78
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionNVD
Insufficient session expiration vulnerability in syslink software AG Avantra on Linux, Windows allows Reusing Session IDs (aka Session Replay).
This issue affects Avantra: before 25.3.1.
AnalysisAI
Session replay weakness in syslink software AG's Avantra monitoring platform (versions before 25.3.1) on Linux and Windows allows remote attackers to reuse captured session identifiers because sessions are not properly expired. With CVSS 9.6 and scope change, an attacker who obtains a valid session ID can impersonate users and pivot into systems Avantra manages; no public exploit identified at time of analysis.
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RemediationAI
24 hours: Identify and document all Avantra instances running versions prior to 25.3.1; assess network exposure and access paths to the platform. 7 days: Restrict Avantra access via network segmentation (firewall rules), enforce multi-factor authentication for administrative accounts, and enable comprehensive session logging and real-time monitoring for anomalous access patterns. …
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