HIGH

CVE-2021-43413

CVSS v3

8.8

HIGH

EPSS Score

2.0 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2021-43413 yet.

Full record on NVD

Description

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.

Technical details

Published: 2021-11-07

Frequently asked questions

What is CVE-2021-43413?

Is CVE-2021-43413 actively exploited?

Active exploitation of CVE-2021-43413 has not been confirmed. Its EPSS score was 2.0% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-43413?

CVE-2021-43413 has a CVSS v3 base score of 8.8 (HIGH severity).

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