Vulnerability · CVE-2026-33923
Update bundle signature bypass in Guardian/CMC before 26.4.0
Published Oct 29, 2026 · Nozomi Networks
Last checked Nov 6, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2026-33923. EPSS is 0.23%. Act only if a listed version of Nozomi Networks is installed.
Gaps on this record
- No version range is stored. A customer cannot check an installed version against this record.
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- High7.2
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.23%
- Remediation
- Advisory link
- Affected products
- Nozomi Networks
A signature verification vulnerability was discovered in the update installation functionality due to inconsistent validation of the update bundle contents.
No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.
How to fix CVE-2026-33923
No stored fix
No vendor fix text is stored. Use the linked advisory before you change production.
Version check
No version range is stored, so an installed version cannot be checked on this page.
Advisory
Open the cve_org record and follow its fix.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-33923. EPSS is 0.23%. Act only if a listed version of Nozomi Networks is installed.
Which versions are affected?
Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
No weakness class is stored. EPSS 0.23%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Oct 29, 2026 · CSAF Advisories
Detected
A signature verification vulnerability was discovered in the update installation functionality due to inconsistent validation of the update bundle contents.
Sources
- CSAF AdvisoriesVendor advisoryNN-2026:21-01:CVE-2026-33923
A signature verification vulnerability was discovered in the update installation functionality due to inconsistent validation of the update bundle contents.
security.nozominetworks.com - CVE.orgVulnerability recordCVE-2026-33923
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-33923
30-day exploitation probability 0.23%
first.org
References
Freshness
Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- CSAF AdvisoriesNov 6, 2026
- FIRST EPSSNov 5, 2026
- CVE.orgOct 30, 2026