CVE-2021-43413 json
An issue was discovered in GNU Hurd before 0.9 20210404-9.
published 2021-11-07 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-30348
- cvss
- 8.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.0%
- EPSS 2.0% chance of exploitation in 30 days, percentile 80%
- public exploits
- 0
- none known
Summary
An issue was discovered in GNU Hurd before 0.9 20210404-9. A single pager port is shared among everyone who mmaps a file, allowing anyone to modify any files that they can read. This can be trivially exploited to get full root access.
Patch / fix
- gnu hurd 0.9.20210404-9
Exploit prediction
1.97% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- lists.gnu.org https://lists.gnu.org/archive/html/bug-hurd/2021-05/msg00079.html referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 9.0 | AV:N/AC:L/Au:S/C:C/I:C/A:C |
References
-
lists.gnu.org
/archive/html/bug-hurd/2021-05/msg00079.html
exploit, mailing-list, vendor-advisory
-
lists.gnu.org
/archive/html/bug-hurd/2002-11/msg00263.html
mailing-list, vendor-advisory
-
lists.gnu.org
/archive/html/bug-hurd/2005-06/msg00191.html
mailing-list, vendor-advisory
- mail-archive.com /bug-hurd%40gnu.org/msg32113.html
Sources
- CVE List CVE-2021-43413
- NVD CVE-2021-43413
Fencer Vulns 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.