CVE-2021-25294
9.8
CRITICAL · CVSS 3.1 · EPSS 10.9% (pctl 96)
Patch early
EPSS 10.9% — above the 10% action threshold.
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.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 10.88% — more likely to be exploited than 96% of all CVEs |
| Weakness | CWE-502 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2021-01-18 |
| Last modified | 2026-06-17 |
Affected (1)
| Vendor | Product |
|---|---|
| opencats | opencats |
References
- https://github.com/snoopysecurity/snoopysecurity.github.io/blob/master/web-application-security/2021/01/16/09_opencats_php_object_injection.html
- https://snoopysecurity.github.io/web-application-security/2021/01/16/09_opencats_php_object_injection.html
- https://www.opencats.org/news/
- https://github.com/snoopysecurity/snoopysecurity.github.io/blob/master/web-application-security/2021/01/16/09_opencats_php_object_injection.html
- https://snoopysecurity.github.io/web-application-security/2021/01/16/09_opencats_php_object_injection.html
- https://www.opencats.org/news/
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