CVE-2021-43412
CVE-2021-43412 is a high-severity vulnerability in Gnu Hurd with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-416.
Key facts
- Severity: High (CVSS 3.x base score 7.8)
- CVSS v2: 7.2
- EPSS exploit prediction: 0% (27th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-416
- Affected product: Gnu Hurd
- Published:
- Last modified:
Description
An issue was discovered in GNU Hurd before 0.9 20210404-9. libports accepts fake notification messages from any client on any port, which can lead to port use-after-free. This can be exploited for local privilege escalation to get full root access.
Frequently asked questions
- What is CVE-2021-43412?
- An issue was discovered in GNU Hurd before 0.9 20210404-9. libports accepts fake notification messages from any client on any port, which can lead to port use-after-free. This can be exploited for local privilege escalation to get full root access.
- How severe is CVE-2021-43412?
- CVE-2021-43412 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2021-43412 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-43412?
- CVE-2021-43412 affects Gnu Hurd. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-43412?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2021-43412 published?
- CVE-2021-43412 was published on 2021-11-07 and last updated on 2026-06-17.
References
- https://lists.gnu.org/archive/html/bug-hurd/2021-05/msg00079.html
- https://www.mail-archive.com/bug-hurd%40gnu.org/msg32116.html
Affected products (1)
- cpe:2.3:a:gnu:hurd:*:*:*:*:*:*:*:*
More vulnerabilities in Gnu Hurd
- CVE-2021-43413 — High (CVSS 8.8): An issue was discovered in GNU Hurd before 0.9 20210404-9. A single pager port is shared among everyone who mmaps a…
- CVE-2021-43411 — High (CVSS 7.5): An issue was discovered in GNU Hurd before 0.9 20210404-9. When trying to exec a setuid executable, there's a window of…
- CVE-2021-43414 — High (CVSS 7.0): An issue was discovered in GNU Hurd before 0.9 20210404-9. The use of an authentication protocol in the proc server is…
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