Security readout for executives and security teams
Plain-English summary
Versa VOS did not replace a browser session token after login. If an attacker can cause a victim to use a pre-set session, the attacker may be able to benefit from that session after authentication. The sources do not provide CVSS scoring or evidence of active exploitation.
Executive priority
Prioritize remediation for internet-reachable or broadly accessible VOS management environments. The issue affects authenticated session integrity, but available sources do not show active exploitation or provide severity scoring.
Technical view
This is a CWE-384 session fixation issue in Versa VOS. A session identifier is issued before authentication and is not rotated after successful login, allowing a pre-authentication session to remain valid post-login. Fixed versions are listed as 16.1R2S11, 20.2.2, 21.1.1, and 21.2.1.
Likely exposure
Organizations running Versa VOS versions earlier than the listed fixed releases may be exposed. The source bundle does not state exact vulnerable version ranges, deployment prerequisites, or whether exposure requires management interface access.
Exploitation context
CISA KEV status is false, and the provided sources do not claim active exploitation. The described attack context requires placing or influencing a session on a device the victim later uses to authenticate.
Researcher notes
Evidence is limited to the CVE description and HackerOne reference. Treat this as session fixation: pre-authentication token remains valid post-authentication. Exact affected ranges, exploit maturity, and operational preconditions are not fully documented in the bundle.
Mitigation direction
- Upgrade Versa VOS to a listed fixed version or newer.
- Check Versa vendor guidance for any additional supported remediation.
- Restrict access to VOS management interfaces to trusted networks.
- Review session-management settings and authentication controls after upgrading.
Validation and detection
- Inventory all Versa VOS versions in production and staging.
- Compare installed versions against 16.1R2S11, 20.2.2, 21.1.1, and 21.2.1.
- Confirm session identifiers rotate after successful login in a controlled test.
- Review logs for suspicious session reuse where telemetry exists.
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-384: 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 lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2018-16495 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/1168192CVE 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.
Session Fixation
Session Fixation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.