Exposure of resource to wrong sphere in Versa VOS
Priority MEDIUM 42CWE-377Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
In VOS and overly permissive "umask" may allow for authorized users of the server to gain unauthorized access through insecure file permissions that can result in an arbitrary read, write, or execution of newly created files and directories. Insecure umask setting was present throughout the Versa servers.
Why it matters now
EPSS 0.01922 80th 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-2018-16494
- 2026-10-03 Alias added: GHSA-82r6-6mqq-4v58
References
Advisory 1
More Versa Operating System vulnerabilities
- TI-2018-11836 Session fixation 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-2018-16494 · CVE Program
- CVE-2018-16494 · NVD
- FIRST EPSS
- GHSA-82r6-6mqq-4v58 · GitHub Advisory Database · CC BY 4.0
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