CVE-2021-39172

Name: CVE-2021-39172
Creator: NVD / NIST
Published: 2021-08-27T23:15:06.9+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 29.17%

Last modified Jun 17, 2026

CVE-2021-39172 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Cachet is an open source status page system. Prior to version 2.5.1, authenticated users, regardless of their privileges (User or Admin), can exploit a new line injection in the configuration edition feature (e.g. EPSS estimates a 29.17% chance of exploitation in the next 30 days.

Description

Cachet is an open source status page system. Prior to version 2.5.1, authenticated users, regardless of their privileges (User or Admin), can exploit a new line injection in the configuration edition feature (e.g. mail settings) and gain arbitrary code execution on the server. This issue was addressed in version 2.5.1 by improving `UpdateConfigCommandHandler` and preventing the use of new lines characters in new configuration values. As a workaround, only allow trusted source IP addresses to access to the administration dashboard.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

29.17%

97.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-93

Affected Software

Vendor	Product	Versions
Catchethq	Catchet	< 2.5.1

References

https://blog.sonarsource.com/cachet-code-execution-via-laravel-configuration-injection/Exploit, Third Party Advisory
https://github.com/fiveai/Cachet/releases/tag/v2.5.1Release Notes, Third Party Advisory
https://github.com/fiveai/Cachet/security/advisories/GHSA-9jxw-cfrh-jxq6Third Party Advisory
https://blog.sonarsource.com/cachet-code-execution-via-laravel-configuration-injection/Exploit, Third Party Advisory
https://github.com/fiveai/Cachet/releases/tag/v2.5.1Release Notes, Third Party Advisory
https://github.com/fiveai/Cachet/security/advisories/GHSA-9jxw-cfrh-jxq6Third Party Advisory

Timeline

Published: Aug 27, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-39172?

How severe is CVE-2021-39172?

CVE-2021-39172 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 29.17% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39172?

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-2021-39172?

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

Scan your code now

Source: NVD / NIST