CVE-2021-34992 json
This vulnerability allows remote attackers to execute arbitrary code on affected installations of Orckestra C1 CMS 6.10.
published 2021-11-15 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-21639
- cvss
- 8.8
- version 3.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 4.3%
- EPSS 4.3% chance of exploitation in 30 days, percentile 91%
- public exploits
- 0
- none known
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.
Patch / fix
Exploit prediction
4.27% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.0 | 8.8 | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.5 | AV:N/AC:L/Au:S/C:P/I:P/A:P |
Affected products
- Orckestra C1 CMS
Classification
- Weakness
-
- CWE-502 Deserialization of Untrusted Data
References
-
github.com
/Orckestra/C1-CMS-Foundation/releases/tag/v6.11
patch, release-notes, third-party-advisory
-
zerodayinitiative.com
/advisories/ZDI-21-1304/
third-party-advisory, vdb-entry
Sources
- CVE List CVE-2021-34992
- NVD CVE-2021-34992
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