Security readout for executives and security teams
Plain-English summary
Versa VOS used an overly permissive umask, causing newly created files and directories to have insecure permissions. An authorized server user could gain access beyond intended limits, including reading, writing, or executing files created on affected Versa servers.
Executive priority
Treat this as a controlled-access privilege and data protection issue. Prioritize remediation where Versa servers are shared, host sensitive configuration, or allow non-administrator server access. Urgency is reduced by the lack of cited active exploitation, but severity cannot be fully scored from the bundle.
Technical view
The issue is an insecure default permission model in Versa VOS. Newly created files and directories could be accessible in unintended ways because umask settings were too permissive across Versa servers. The source maps this to CWE-377 and lists fixed versions 16.1R2S11, 20.2.2, 21.1.1, and 21.2.1.
Likely exposure
Exposure is most relevant for organizations running Versa VOS versions below the listed fixed releases, especially where multiple authorized users or service accounts have server access. The bundle does not identify internet-exposed exploitation or unauthenticated impact.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. The described attack context requires an authorized server user gaining unauthorized access through insecure permissions on newly created files or directories.
Researcher notes
The public bundle is sparse: no CVSS vector, no detailed affected version range, and no exploit evidence. Research should focus on confirming branch-specific fixed versions, permission behavior before and after upgrade, and whether operational accounts could access sensitive newly created artifacts.
Mitigation direction
- Upgrade Versa VOS to the fixed release for the deployed branch.
- Verify vendor guidance before assuming other versions are unaffected.
- Restrict server access to required administrators and service accounts.
- Review file and directory permission baselines on Versa servers.
- Monitor for unexpected changes to newly created files or directories.
Validation and detection
- Inventory all Versa VOS deployments and versions.
- Compare each deployment against fixed versions 16.1R2S11, 20.2.2, 21.1.1, and 21.2.1.
- Check umask configuration on Versa servers against vendor guidance.
- Test newly created file and directory permissions in a controlled environment.
- Review local accounts and service accounts with server access.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-377: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2018-16494 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://hackerone.com/reports/1168191CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Insecure Temporary File
Insecure Temporary File represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.