CVE-2021-25294

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

OpenCATS through 0.9.5-3 unsafely deserializes index.php?m=activity requests, leading to remote code execution. This occurs because lib/DataGrid.php calls unserialize for the parametersactivity:ActivityDataGrid parameter. The PHP object injection exploit chain can leverage an __destruct magic method in guzzlehttp.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-502

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

https://github.com/snoopysecurity/snoopysecurity.github.io/blob/master/web-application-security/2021/01/16/09_opencats_php_object_injection.htmlPatch, Third Party Advisory
https://snoopysecurity.github.io/web-application-security/2021/01/16/09_opencats_php_object_injection.htmlExploit, Third Party Advisory
https://www.opencats.org/news/Vendor Advisory
https://github.com/snoopysecurity/snoopysecurity.github.io/blob/master/web-application-security/2021/01/16/09_opencats_php_object_injection.htmlPatch, Third Party Advisory
https://snoopysecurity.github.io/web-application-security/2021/01/16/09_opencats_php_object_injection.htmlExploit, Third Party Advisory
https://www.opencats.org/news/Vendor Advisory

Timeline

Published: Jan 18, 2021
Last modified: Jun 17, 2026
NVD status: Modified

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