CVE-2018-16495

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-05-26 · updated 2026-06-17
Weakness: CWE-384

Description

In VOS user session identifier (authentication token) is issued to the browser prior to authentication but is not changed after the user successfully logs into the application. Failing to issue a new session ID following a successful login introduces the possibility for an attacker to set up a trap session on the device the victim is likely to login with.

Affected products

Versa VOS: before 16.1r2s11; from 20.2.0 before 20.2.2; from 21.1.0 before 21.1.1 — fixed in 16.1r2s11, 20.2.2, 21.1.1

How to fix

Upgrade to a fixed version: Versa VOS 16.1r2s11, 20.2.2, 21.1.1. Check the vendor advisory for mitigations.

References

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