Session fixation in Versa VOS
Priority MEDIUM 40CWE-384Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Spoofing
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-384.
Summary
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.
Why it matters now
EPSS 0.00911 60th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | Versa VOS | Fixed Versions: 16.1R2S11, 20.2.2, 21.1.1, 21.2.1 | — | No fix listed | CNA |
- Versa VOS Vendor— Affected Fixed Versions: 16.1R2S11, 20.2.2, 21.1.1, 21.2.1 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:versa-networks:versa_operating_system:*:*:*:*:*:*:*:* | before 16.1r2s11; 20.2.0 to before 20.2.2; 21.1.0 to before 21.1.1 | Vulnerable | Versa |
- cpe:2.3:o:versa-networks:versa_operating_system:*:*:*:*:*:*:*:* Versions before 16.1r2s11; 20.2.0 to before 20.2.2; 21.1.0 to before 21.1.1 Vulnerable ·Versa
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2018-16495
- 2026-10-03 Alias added: GHSA-gvq8-8f97-wwvq
References
Advisory 1
More Versa Operating System vulnerabilities
- TI-2018-11835 Exposure of resource to wrong sphere in Versa VOS CVSS 3.1HIGH 8.8
- TI-2018-11840 In VOS compromised, an attacker at network endpoints can possibly view communications… CVSS 3.1MEDIUM 5.9
- TI-2019-15170 Insufficiently protected credentials in Versa Director, Versa Analytics, Versa VOS CVSS 3.1MEDIUM 5.5
Sources
- CVE-2018-16495 · CVE Program
- CVE-2018-16495 · NVD
- FIRST EPSS
- GHSA-gvq8-8f97-wwvq · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences