CVE-2021-3899
HIGHCVSS 7.8/10EPSS 0.38%
Last modified
CVE-2021-3899 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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.. EPSS estimates a 0.38% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Canonical | Apport | < 2.21.0 |
| Canonical | Ubuntu Linux | 18.04 |
| Canonical | Ubuntu Linux | 20.04 |
| Canonical | Ubuntu Linux | 21.10 |
| Canonical | Ubuntu Linux | 22.04 |
References
- https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1948376Issue Tracking, Patch
- https://ubuntu.com/security/notices/USN-5427-1Vendor Advisory
- https://www.cve.org/CVERecord?id=CVE-2021-3899Third Party Advisory
- https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1948376Issue Tracking, Patch
- https://ubuntu.com/security/notices/USN-5427-1Vendor Advisory
- https://www.cve.org/CVERecord?id=CVE-2021-3899Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2021-3899?
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.
How severe is CVE-2021-3899?
CVE-2021-3899 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.38% probability of exploitation in the next 30 days.
How do I fix CVE-2021-3899?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-3899?
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