CVE-2021-25294

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.

• CWE-502

• 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

Published

Jan 18, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2021-25288An issue was discovered in Pillow before 8.2.0. There is an …9.1
• CVE-2021-25289An issue was discovered in Pillow before 8.1.1. TiffDecode h…9.8
• CVE-2021-25290An issue was discovered in Pillow before 8.1.1. In TiffDecod…7.5
• CVE-2021-25291An issue was discovered in Pillow before 8.1.1. In TiffDecod…7.5
• CVE-2021-25292An issue was discovered in Pillow before 8.1.1. The PDF pars…6.5
• CVE-2021-25293An issue was discovered in Pillow before 8.1.1. There is an …7.5
• CVE-2021-25295OpenCATS through 0.9.5-3 has multiple Cross-site Scripting (…6.1
• CVE-2021-25296Nagios XI version xi-5.7.5 is affected by OS command injecti…8.8
• CVE-2021-25297Nagios XI version xi-5.7.5 is affected by OS command injecti…8.8
• CVE-2021-25298Nagios XI version xi-5.7.5 is affected by OS command injecti…8.8
• CVE-2021-25299Nagios XI version xi-5.7.5 is affected by cross-site scripti…6.1
• CVE-2021-25306A buffer overflow vulnerability in the AT command interface …7.5