CVE-2021-43411
CVE-2021-43411 is a high-severity vulnerability in Gnu Hurd with a CVSS 3.x base score of 7.5. 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-362.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- CVSS v2: 8.5
- EPSS exploit prediction: 1% (65th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-362
- Affected product: Gnu Hurd
- Published:
- Last modified:
Description
An issue was discovered in GNU Hurd before 0.9 20210404-9. When trying to exec a setuid executable, there's a window of time when the process already has the new privileges, but still refers to the old task and is accessible through the old process port. This can be exploited to get full root access.
Frequently asked questions
- What is CVE-2021-43411?
- An issue was discovered in GNU Hurd before 0.9 20210404-9. When trying to exec a setuid executable, there's a window of time when the process already has the new privileges, but still refers to the old task and is accessible through the old process port. This can be exploited to get full root access.
- How severe is CVE-2021-43411?
- CVE-2021-43411 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2021-43411 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-43411?
- CVE-2021-43411 affects Gnu Hurd. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-43411?
- 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-2021-43411 published?
- CVE-2021-43411 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://salsa.debian.org/hurd-team/hurd/-/blob/4d1b079411e2f40576e7b58f9b5b78f733a2beda/debian/patches/0034-proc-Use-UIDs-for-evaluating-permissions.patch
- https://www.mail-archive.com/bug-hurd%40gnu.org/msg32112.html
Affected products (1)
- cpe:2.3:a:gnu:hurd:*:*:*:*:*:*:*:*
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