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CVE-2021-3899

HighPublished

There is a race condition in the 'replaced executable' detection that, with the correct local configuration, allow an attacker to execute arbitrary code as...

Published: Jun 3, 2024
Updated: Aug 19, 2024
Assigning CNA: canonical
Evidence observed: Aug 8, 2026

Primary CVSS

7.8/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

0.4%

Low · next 30 days

Percentile: 32.2%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

There is a race condition in the 'replaced executable' detection that, with the correct local configuration, allow an attacker to execute arbitrary code as root.

Sources

CVE-2021-3899_PoCPoC
race condition in apport lead to Local Privilege Escalation on Ubuntu

Responsible use

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