CVE-2021-3899: Race Condition
Last updated 18 August 2025
Other sources
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.
— Debian
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2021-3899?
CVE-2021-3899 is classified as a high severity vulnerability due to its potential for arbitrary code execution as root.
How do I fix CVE-2021-3899?
To fix CVE-2021-3899, update your affected software to the latest version that includes the security patch.
What software is affected by CVE-2021-3899?
CVE-2021-3899 affects software that utilizes 'replaced executable' detection mechanisms.
Can CVE-2021-3899 be exploited remotely?
CVE-2021-3899 requires local access to exploit, making remote exploitation unlikely but not impossible with certain configurations.
What are the potential impacts of CVE-2021-3899?
The potential impacts of CVE-2021-3899 include unauthorized execution of arbitrary code, possibly leading to a full system compromise.