TI-2021-13979 Aliases CVE-2021-34992 GHSA-xr89-j843-vpgq

Deserialization of untrusted data in Orckestra C1 CMS

MEDIUM 45CWE-502Published 2021-11-15 · Updated 2024-08-04

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-502.

Summary

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.

Why it matters now

EPSS 0.04274 91st percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Orckestra	C1 CMS	6.10	—	No fix listed	CNA

C1 CMS VendorOrckestra Affected 6.10 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:orckestra:c1_cms:6.10:::::::*	6.10	Vulnerable	Orckestra

cpe:2.3:a:orckestra:c1_cms:6.10:*:*:*:*:*:*:* Versions 6.10 Vulnerable ·Orckestra

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-34992
2026-10-03 Alias added: GHSA-xr89-j843-vpgq

References

Patch 1

https://github.com/Orckestra/C1-CMS-Foundation/releases/tag/v6.11

Advisory 1

https://www.zerodayinitiative.com/advisories/ZDI-21-1304/

TI-2022-18632 Orckestra C1 CMS's deserialization of untrusted data allows for arbitrary code execution. CVSS 3.1CRITICAL 9.0
TI-2019-13230 An issue was discovered in Orckestra C1 CMS through 6.6. CVSS 3.1HIGH 8.8
TI-2022-08602 Deserialization of untrusted data in C1 CMS. CVSS 3.1HIGH 7.6

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences