Deserialization in Opencats
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.
Vulnerability class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.113 (96.0th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 96.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.107 · newest: 0.113 · change: +0.007
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- snoopysecurity.github.io/web-application-security/2021/01/16/09_opencats_php_ob… (Exploit, Third Party Advisory)
- github.com/snoopysecurity/snoopysecurity.github.io/blob/master/web-application-… (Patch, Third Party Advisory)
- www.opencats.org/news/ (Vendor Advisory)
Frequently asked questions
- What is CVE-2021-25294?
- CVE-2021-25294 is a critical-severity vulnerability in Opencats, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2021-01-18.
- How severe is CVE-2021-25294?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-25294 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.