CVE-2025-56764: Trivision NC-227WF firmware 5.80 (build 20141010) login mechanism reveals whether a username exists or not by

Routine

MEDIUM 5.3REMOTEMITIGATE

CVE-2025-56764 is a medium-severity flaw (CVSS 5.3) affecting trivision nc-227wf firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Trivision NC-227WF firmware 5.80 (build 20141010) login mechanism reveals whether a username exists or not by returning different error messages ("Unknown user" vs. "Wrong password"), allowing an attacker to enumerate valid usernames.

Why this priority

Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 82%)
CISA exploited list	No
Weakness	CWE-204
Published	2025-09-29
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: trivisionsecurity

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-09-29 20:15 UTCPublished CVE record published
2026-06-17 09:42 UTCUpdated Record last modified

trivisionsecurity trivision nc-227wf firmware MITIGATE

Affected: 5.80

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.80

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-56764?

trivision nc-227wf firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-56764 being exploited?

CVE-2025-56764 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-56764 affect?

CVE-2025-56764 affects trivision nc-227wf firmware. Severity is medium (CVSS 5.3). Trivision NC-227WF firmware 5.80 (build 20141010) login mechanism reveals whether a username exists or not by returning different error messages ("Unknown user" vs. "Wrong password"), allowing an attacker to enumerate valid usernames.

How urgent is CVE-2025-56764?

Priority 28/100. Remotely exploitable, no login, no user action

References

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