CVE-2021-34992

Name: CVE-2021-34992
Creator: NVD / NIST
Published: 2021-11-15T16:15:09.617+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 4.14%

Last modified Jun 17, 2026

CVE-2021-34992 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. EPSS estimates a 4.14% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

4.14%

89.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Orckestra	C1 Cms	6.10

References

https://github.com/Orckestra/C1-CMS-Foundation/releases/tag/v6.11Patch, Release Notes, Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1304/Third Party Advisory, VDB Entry
https://github.com/Orckestra/C1-CMS-Foundation/releases/tag/v6.11Patch, Release Notes, Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1304/Third Party Advisory, VDB Entry

Timeline

Published: Nov 15, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-34992?

How severe is CVE-2021-34992?

CVE-2021-34992 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 4.14% probability of exploitation in the next 30 days.

How do I fix CVE-2021-34992?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-34992?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST