CVE-2020-27633
Critical
Published: 10 October 2023
Published
10 October 2023
Modified
21 November 2024
KEV Added
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Patch
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CVSS Score v3.1
9.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS Score
0.0019
40.2th percentile
Risk Priority
18
60% EPSS · 20% KEV · 20% CVSS
Summary
CVE-2020-27633 is a critical-severity Use of Insufficiently Random Values (CWE-330) vulnerability in Butok Fnet. Its CVSS base score is 9.1 (Critical).
Operationally, ranked at the 40.2th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2020-20140
Vulnerability details
In FNET 4.6.3, TCP ISNs are improperly random.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
butok
fnet
4.6.3
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
addresses: CWE-330
Key generation under controlled management uses approved random-bit sources rather than insufficiently random values.