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Vulnerability record · CVE-2021-39173 · published 27 August 2021

CVE-2021-39173: Catchethq catchet vulnerability

CCatchethq · Catchet

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.

8.8 CVSS 3.1 High EPSS 2.4% · top 16.9% CWE-704 · CWE-704
8.8CVSS 3.1 base score, v2 6.5
2.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://blog.sonarsource.com/cachet-code-execution-via-laravel-configuration-injection/ ExploitThird Party Advisory
https://github.com/fiveai/Cachet/releases/tag/v2.5.1 Release NotesThird Party Advisory
https://github.com/fiveai/Cachet/security/advisories/GHSA-r67m-m8c7-jp83 Third Party Advisory
https://blog.sonarsource.com/cachet-code-execution-via-laravel-configuration-injection/ ExploitThird Party Advisory
https://github.com/fiveai/Cachet/releases/tag/v2.5.1 Release NotesThird Party Advisory
https://github.com/fiveai/Cachet/security/advisories/GHSA-r67m-m8c7-jp83 Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.8CVE-2021-39174Catchethq catchet vulnerabilityCachet is an open source status page system. Prior to version 2.5.1, authenticated users, regardless of their privileges (User or Admin), can leak th…EPSS 5.0%8.8CVE-2021-39172Catchethq catchet vulnerabilityCachet is an open source status page system. Prior to version 2.5.1, authenticated users, regardless of their privileges (User or Admin), can exploit…EPSS 29%

Source: NIST National Vulnerability Database (record CVE-2021-39173), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.