CVE-2021-34992

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-11-15 · updated 2026-06-17
Weakness: CWE-502

Description

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Orckestra C1 CMS 6.10. Authentication is required to exploit this vulnerability. The specific flaw exists within Composite.dll. The issue results from the lack of proper validation of user-supplied data, which can result in deserialization of untrusted data. An attacker can leverage this vulnerability to execute code in the context of the service account. Was ZDI-CAN-14740.

Affected products

Orckestra C1-CMS-Foundation: 6.10

References

https://github.com/Orckestra/C1-CMS-Foundation/releases/tag/v6.11
https://www.zerodayinitiative.com/advisories/ZDI-21-1304/
https://github.com/Orckestra/C1-CMS-Foundation/releases/tag/v6.11
https://www.zerodayinitiative.com/advisories/ZDI-21-1304/

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