CVE-2025-59818: This vulnerability allows authenticated attackers to execute arbitrary commands on the underlying system using

Q: How do I fix CVE-2025-59818?

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

Q: Is CVE-2025-59818 being exploited?

CVE-2025-59818 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-2025-59818 affect?

CVE-2025-59818 affects tcis-3 firmware. Severity is critical (CVSS 10.0). This vulnerability allows authenticated attackers to execute arbitrary commands on the underlying system using the file name of an uploaded file.

Q: How urgent is CVE-2025-59818?

Priority 52/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 10.0REMOTEUPGRADE

CVE-2025-59818 is a critical-severity flaw (CVSS 10.0) 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 arbitrary commands on the underlying system using the file name of an uploaded file.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	10.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-77
Published	2026-02-04
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

2026-02-04 11:16 UTCPublished CVE record published
2026-06-17 09:46 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-2025-59818?

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

Is CVE-2025-59818 being exploited?

CVE-2025-59818 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-2025-59818 affect?

CVE-2025-59818 affects tcis-3 firmware. Severity is critical (CVSS 10.0). This vulnerability allows authenticated attackers to execute arbitrary commands on the underlying system using the file name of an uploaded file.

How urgent is CVE-2025-59818?

Priority 52/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-64091 HIGH 8.6 UPGRADE This vulnerability allows authenticated attackers to execute commands via the NTP-configuration of the device.
CVE-2025-64090 CRITICAL 10.0 UPGRADE This vulnerability allows authenticated attackers to execute commands via the hostname of the device.

References

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