Improper authentication in Fortinet FSSO Windows DC Agent, FSSO Windows CA
Priority MEDIUM 43CWE-287Published · Updated
Key facts
- Attack vector
- Adjacent network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- 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-287.
Summary
An improper authentication vulnerability in FSSO Collector version 5.0.295 and below may allow an unauthenticated user to bypass a FSSO firewall policy and access the protected network via sending specifically crafted UDP login notification packets.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01031 63rd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Fortinet | Fortinet FSSO Windows DC Agent, FSSO Windows CA | FSSO Windows DC Agent 5.0.295, 5.0.294; FSSO Windows CA 5.0.295, 5.0.294 | — | No fix listed | CNA |
- Fortinet FSSO Windows DC Agent, FSSO Windows CA VendorFortinet Affected FSSO Windows DC Agent 5.0.295, 5.0.294; FSSO Windows CA 5.0.295, 5.0.294 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-26088
- 2026-10-03 Alias added: GHSA-pp6p-mhjc-6vgp
References
Sources
- CVE-2021-26088 · CVE Program
- CVE-2021-26088 · NVD
- FIRST EPSS
- GHSA-pp6p-mhjc-6vgp · GitHub Advisory Database · CC BY 4.0
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