CVE-2026-33923

Update bundle signature bypass in Guardian/CMC before 26.4.0

State
Published
Severity
7.5 High
Published
Oct 29, 2026
Updated
Oct 29, 2026
Reserved
Mar 24, 2026

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Description

A signature verification vulnerability was discovered in the update installation functionality due to inconsistent validation of the update bundle contents. An attacker with administrative privileges can remotely supply a crafted update bundle that passes signature verification but runs an unsigned script when the bundle is installed. The script runs with root privileges, allowing the attacker to read or modify sensitive data, change the appliance configuration, or shut down the appliance.

Scores

CVSSScoreVectorSource
4.07.5 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:NNozomi
3.17.2 HighCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:HNozomi

Weaknesses

  • CWE-347 Improper Verification of Cryptographic Signature

Affected Products

ProductVersions
GuardianNozomi Networks
  • before 26.4.0Affected
CMCNozomi Networks
  • before 26.4.0Affected

References

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