CVE-2026-3803: A vulnerability was identified in Tenda i3 1.0.0.6(2204)

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HIGH 8.8MITIGATE

CVE-2026-3803 is a high-severity flaw (CVSS 8.8) affecting i3 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability was identified in Tenda i3 1.0.0.6(2204). This affects the function formWifiMacFilterGet of the file /goform/WifiMacFilterGet. The manipulation of the argument index leads to stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit is publicly available and might be used.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.7% (top 49%)
CISA exploited list	No
Weakness	CWE-119, CWE-121
Published	2026-03-09
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: tenda

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

Am I affected?

Timeline

2026-03-09 06:16 UTCPublished CVE record published
2026-06-17 10:44 UTCUpdated Record last modified

tenda i3 firmware MITIGATE

Affected: 1.0.0.6\(2204\)

Fixed in: no fixed release known

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-2026-3803?

i3 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-3803 being exploited?

CVE-2026-3803 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-2026-3803 affect?

CVE-2026-3803 affects i3 firmware. Severity is high (CVSS 8.8). A vulnerability was identified in Tenda i3 1.0.0.6(2204). This affects the function formWifiMacFilterGet of the file /goform/WifiMacFilterGet. The manipulation of the argument index leads to stack-based buffer overflow. It is possible to in

How urgent is CVE-2026-3803?

Priority 49/100. High severity; Public exploit reference

Related CVEs

CVE-2026-5841 HIGH 7.3 MITIGATE A weakness has been identified in Tenda i3 1.0.0.6(2204)
CVE-2026-3971 HIGH 8.8 MITIGATE A vulnerability has been found in Tenda i3 1.0.0.6(2204)
CVE-2026-3970 HIGH 8.8 MITIGATE A flaw has been found in Tenda i3 1.0.0.6(2204)
CVE-2026-3804 HIGH 8.8 MITIGATE A security flaw has been discovered in Tenda i3 1.0.0.6(2204)
CVE-2026-3802 HIGH 8.8 MITIGATE A vulnerability was determined in Tenda i3 1.0.0.6(2204)

References

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