CVE-2021-45488 json
In NetBSD through 9.2, there is an information leak in the TCP ISN (ISS) generation algorithm.
published 4y ago modified 4mo ago also EUVD-2021-32254
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 62%
- public exploits
- 0
- none known
Summary
In NetBSD through 9.2, there is an information leak in the TCP ISN (ISS) generation algorithm.
Patch / fix
Is CVE-2021-45488 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerExploit prediction
1.00% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:P/I:N/A:N |
Classification
- Weakness
-
- CWE-330 Use of Insufficiently Random Values
References
-
ftp.netbsd.org
/pub/NetBSD/security/advisories/NetBSD-SA2021-001.txt.asc
patch, vendor-advisory
-
arxiv.org
/pdf/2112.09604.pdf
technical-description, third-party-advisory
Sources
- CVE List CVE-2021-45488
- NVD CVE-2021-45488
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.