CVE-2026-6989: A vulnerability has been found in Tenda F453 up to 1.0.0.3

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MEDIUM 6.3MITIGATE

CVE-2026-6989 is a medium-severity flaw (CVSS 6.3) affecting f453 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability has been found in Tenda F453 up to 1.0.0.3. Impacted is the function TendaTelnet of the file /goform/telnet of the component Telnet Service. Such manipulation leads to command injection. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	3.2% (top 12%)
CISA exploited list	No
Weakness	CWE-74, CWE-77
Published	2026-04-25
Last modified	2026-10-26

Publisher (CNA): VulDB · Vendor: tenda

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-25 18:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

tenda f453 firmware MITIGATE

Affected: 1.0.0.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.0.3

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-2026-6989?

f453 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-6989 being exploited?

CVE-2026-6989 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-2026-6989 affect?

CVE-2026-6989 affects f453 firmware. Severity is medium (CVSS 6.3). A vulnerability has been found in Tenda F453 up to 1.0.0.3. Impacted is the function TendaTelnet of the file /goform/telnet of the component Telnet Service. Such manipulation leads to command injection. It is possible to launch the attack r

How urgent is CVE-2026-6989?

Priority 49/100. Public exploit reference

References

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