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CVE-2026-8670

Avantra vulnerability

9.6 CRITICALEPSS 0.40%
  1. Published22 May 2026

Description

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected products

Avantra< 25.3.1

Remediation

Fixed in
Avantra≥ 25.3.1

References

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Frequently asked

Is CVE-2026-8670 being actively exploited?

CVE-2026-8670 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.40%.

How severe is CVE-2026-8670?

CVE-2026-8670 has a CVSS 3.1 base score of 9.6, rated critical. EPSS estimates a 0.40% probability of exploitation.

Which products are affected by CVE-2026-8670?

Affected products include Avantra.

How do I fix CVE-2026-8670?

Upgrade affected software to a fixed version, for example Avantra 25.3.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-8670 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.