CVE-2025-64091: This vulnerability allows authenticated attackers to execute commands via the NTP-configuration of the device.

Q: How do I fix CVE-2025-64091?

tcis-3 firmware: upgrade to 9.2.3.3. Exact commands for each OS are on this page.

Q: Is CVE-2025-64091 being exploited?

CVE-2025-64091 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-64091 affect?

CVE-2025-64091 affects tcis-3 firmware. Severity is high (CVSS 8.6). This vulnerability allows authenticated attackers to execute commands via the NTP-configuration of the device.

Q: How urgent is CVE-2025-64091?

Priority 43/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 8.6REMOTEUPGRADE

CVE-2025-64091 is a high-severity flaw (CVSS 8.6) affecting tcis-3 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

This vulnerability allows authenticated attackers to execute commands via the NTP-configuration of the device.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.6 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-78
Published	2026-01-09
Last modified	2026-06-17

Publisher (CNA): National Cyber Security Centre Netherlands (NCSC-NL) · Vendor: zenitel

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

Am I affected?

Timeline

2026-01-09 10:15 UTCPublished CVE record published
2026-06-17 09:53 UTCUpdated Record last modified

zenitel tcis-3 firmware UPGRADE

Affected: < 9.2.3.3

Fixed in: 9.2.3.3

Safe to downgrade to: no unaffected older release

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-2025-64091?

tcis-3 firmware: upgrade to 9.2.3.3. Exact commands for each OS are on this page.

Is CVE-2025-64091 being exploited?

CVE-2025-64091 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-2025-64091 affect?

CVE-2025-64091 affects tcis-3 firmware. Severity is high (CVSS 8.6). This vulnerability allows authenticated attackers to execute commands via the NTP-configuration of the device.

How urgent is CVE-2025-64091?

Priority 43/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-64090 CRITICAL 10.0 UPGRADE This vulnerability allows authenticated attackers to execute commands via the hostname of the device.
CVE-2025-59818 CRITICAL 10.0 UPGRADE This vulnerability allows authenticated attackers to execute arbitrary commands on the underlying system using

References

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