XSS in Nozomi Networks Cmc
CVE-2025-40891
A Stored HTML Injection vulnerability was discovered in the Time Machine Snapshot Diff functionality due to improper validation of network traffic data. An unauthenticated attacker can send specially crafted network packets at two different times to inject HTML tags into asset attributes across two snapshots. Exploitation requires a victim to use the Time Machine Snapshot Diff feature on those specific snapshots and perform specific GUI actions, at which point the injected HTML renders in their browser, enabling phishing and open redirect attacks. Full XSS exploitation is prevented by input validation and Content Security Policy. Attack complexity is high due to multiple required conditions.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (6.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 6th percentile — 6.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Nozomi Networks Cmc — versions 0
- Nozomi Networks Guardian — versions 0
- Nozominetworks Cmc
- Nozominetworks Guardian
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2025-40891?
- CVE-2025-40891 is a medium-severity vulnerability in Nozomi Networks Cmc, classified under Cross-site Scripting. CVSS score: 4.7/10. Published 2025-12-18.
- How severe is CVE-2025-40891?
- Medium severity. CVSS v3 base score is 4.7 out of 10.