CVE-2025-28220: Tenda W6_S v1.0.0.4_510 has a Buffer Overflow vulnerability in the setcfm function, which allows remote attack

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HIGH 7.5REMOTEMITIGATE

CVE-2025-28220 is a high-severity flaw (CVSS 7.5) affecting w6-s firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Tenda W6_S v1.0.0.4_510 has a Buffer Overflow vulnerability in the setcfm function, which allows remote attackers to cause web server crash via parameter funcpara1 passed to the binary through a POST request.

Why this priority

High severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-120
Published	2025-03-28
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: tenda

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

Am I affected?

Timeline

2025-03-28 14:15 UTCPublished CVE record published
2026-06-17 09:04 UTCUpdated Record last modified

tenda w6-s firmware MITIGATE

Affected: 1.0.0.4\(510\)

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-2025-28220?

w6-s firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-28220 being exploited?

CVE-2025-28220 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-2025-28220 affect?

CVE-2025-28220 affects w6-s firmware. Severity is high (CVSS 7.5). Tenda W6_S v1.0.0.4_510 has a Buffer Overflow vulnerability in the setcfm function, which allows remote attackers to cause web server crash via parameter funcpara1 passed to the binary through a POST request.

How urgent is CVE-2025-28220?

Priority 42/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-28221 HIGH 7.5 MITIGATE Tenda W6_S v1.0.0.4_510 has a Buffer Overflow vulnerability in the set_local_time function, which allows remot
CVE-2025-15255 CRITICAL 9.8 MITIGATE A vulnerability was determined in Tenda W6-S 1.0.0.4(510)
CVE-2025-15254 MEDIUM 6.3 MITIGATE A vulnerability was found in Tenda W6-S 1.0.0.4(510)

References

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