What’s Vulnerable › Vulnerabilities

CVE-2021-39173: Forced reinstall

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-08-27 · updated 2026-06-17
• Weakness: CWE-704

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 trick Cachet and install the instance again, leading to arbitrary code execution on the server. This issue was addressed in version 2.5.1 by improving the middleware `ReadyForUse`, which now performs a stricter validation of the instance name. As a workaround, only allow trusted source IP addresses to access to the administration dashboard.

Affected products

• Catchethq Catchet: before 2.5.1 — fixed in 2.5.1

How to fix

Upgrade to a fixed version: Catchethq Catchet 2.5.1. Check the vendor advisory for mitigations.

References

• https://blog.sonarsource.com/cachet-code-execution-via-laravel-configuration-injection/
• https://github.com/fiveai/Cachet/releases/tag/v2.5.1
• https://github.com/fiveai/Cachet/security/advisories/GHSA-r67m-m8c7-jp83
• https://blog.sonarsource.com/cachet-code-execution-via-laravel-configuration-injection/
• https://github.com/fiveai/Cachet/releases/tag/v2.5.1
• https://github.com/fiveai/Cachet/security/advisories/GHSA-r67m-m8c7-jp83

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