CVE-2021-39274

Name: CVE-2021-39274
Creator: NVD / NIST
Published: 2021-08-19T12:15:09.487+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 3.12%

Last modified Jun 17, 2026

CVE-2021-39274 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. In XeroSecurity Sn1per 9.0 (free version), insecure directory permissions (0777) are set during installation, allowing an unprivileged user to modify the main application and the application configuration file. This results in arbitrary code execution with root privileges.. EPSS estimates a 3.12% chance of exploitation in the next 30 days.

Description

In XeroSecurity Sn1per 9.0 (free version), insecure directory permissions (0777) are set during installation, allowing an unprivileged user to modify the main application and the application configuration file. This results in arbitrary code execution with root privileges.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

3.12%

86.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-276

Affected Software

Vendor	Product	Versions
Xerosecurity	Sn1per	9.0

References

https://github.com/1N3/Sn1per/issues/357Exploit, Third Party Advisory
https://github.com/1N3/Sn1per/releasesRelease Notes, Third Party Advisory
https://github.com/nikip72/CVE-2021-39273-CVE-2021-39274Exploit, Third Party Advisory
https://github.com/1N3/Sn1per/issues/357Exploit, Third Party Advisory
https://github.com/1N3/Sn1per/releasesRelease Notes, Third Party Advisory
https://github.com/nikip72/CVE-2021-39273-CVE-2021-39274Exploit, Third Party Advisory

Timeline

Published: Aug 19, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-39274?

How severe is CVE-2021-39274?

CVE-2021-39274 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.12% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39274?

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.

Are you affected by CVE-2021-39274?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST