CVE-2021-40343
HIGHCVSS 7.8/10EPSS 0.66%
Last modified
CVE-2021-40343 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. An issue was discovered in Nagios XI 5.8.5. Insecure file permissions on the nagios_unbundler.py file allow the nagios user to elevate their privileges to the root user.. EPSS estimates a 0.66% chance of exploitation in the next 30 days.
Description
An issue was discovered in Nagios XI 5.8.5. Insecure file permissions on the nagios_unbundler.py file allow the nagios user to elevate their privileges to the root user.
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 |
|---|---|---|
| Nagios | Nagios Xi | 5.8.5 |
References
- https://assets.nagios.com/downloads/nagiosxi/CHANGES-5.TXTRelease Notes, Vendor Advisory
- https://synacktiv.comNot Applicable
- https://www.synacktiv.com/sites/default/files/2021-10/Nagios_XI_multiple_vulnerabilities_0.pdfExploit, Third Party Advisory
- https://assets.nagios.com/downloads/nagiosxi/CHANGES-5.TXTRelease Notes, Vendor Advisory
- https://synacktiv.comNot Applicable
- https://www.synacktiv.com/sites/default/files/2021-10/Nagios_XI_multiple_vulnerabilities_0.pdfExploit, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-40343?
An issue was discovered in Nagios XI 5.8.5. Insecure file permissions on the nagios_unbundler.py file allow the nagios user to elevate their privileges to the root user.
How severe is CVE-2021-40343?
CVE-2021-40343 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.66% probability of exploitation in the next 30 days.
How do I fix CVE-2021-40343?
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-2021-40343?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST