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CVE-2021-34992

28
FAUCET Score

CVE-2021-34992 is a critical deserialization vulnerability affecting Orckestra C1 CMS version 6.10, specifically within the Composite.dll component. This flaw allows authenticated remote attackers to execute arbitrary code due to insufficient validation of user-supplied data. With a CVSS score of 8.8 (High), successful exploitation grants attackers code execution in the context of the service account, leading to high impacts on confidentiality, integrity, and availability. While no public exploits, Metasploit modules, or Nuclei templates are currently available, and there is minimal community discussion or media coverage, its high FAUCET Risk Score of 91/100 indicates significant potential danger.

Impacted Technologies

VendorProductVersion(s)CPE
6.10CPE matchmatch criteria
cpe:2.3:a:orckestra:c1_cms:6.10:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

8.8HIGH

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
4.14%
Probability of exploitation in next 30 days
EPSS Percentile
89.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0414 is in the 89th percentile among its peer group of 17,822 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / Orckestra/C1-CMS-Foundation/releases/tag/v6.11
PatchRelease NotesThird Party Advisory
zerodayinitiative.com / advisories/ZDI-21-1304
Third Party AdvisoryVDB Entry