CVE-2020-27633
CRITICALCVSS 9.1/10EPSS 0.87%
Last modified
CVE-2020-27633 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. In FNET 4.6.3, TCP ISNs are improperly random.. EPSS estimates a 0.87% chance of exploitation in the next 30 days.
Description
In FNET 4.6.3, TCP ISNs are improperly random.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Butok | Fnet | 4.6.3 |
References
- https://www.cisa.gov/news-events/ics-advisories/icsa-21-042-01Third Party Advisory, US Government Resource
- https://www.forescout.comThird Party Advisory
- https://www.cisa.gov/news-events/ics-advisories/icsa-21-042-01Third Party Advisory, US Government Resource
- https://www.forescout.comThird Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2020-27633?
In FNET 4.6.3, TCP ISNs are improperly random.
How severe is CVE-2020-27633?
CVE-2020-27633 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 0.87% probability of exploitation in the next 30 days.
How do I fix CVE-2020-27633?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2020-27633?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST