CVE-2025-52221: Tenda AC6 15.03.05.16_multi is vulnerable to Buffer Overflow in the formSetCfm function via the funcname, func

This week

CRITICAL 9.8REMOTEMITIGATE

CVE-2025-52221 is a critical-severity flaw (CVSS 9.8) affecting ac6 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Tenda AC6 15.03.05.16_multi is vulnerable to Buffer Overflow in the formSetCfm function via the funcname, funcpara1, and funcpara2 parameters.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 67%)
CISA exploited list	No
Weakness	CWE-787, CWE-120
Published	2026-04-08
Last modified	2026-07-25

Publisher (CNA): MITRE · Vendor: tenda

Last updated 2026-07-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-08 18:24 UTCPublished CVE record published
2026-07-25 10:10 UTCUpdated Record last modified

tenda ac6 firmware MITIGATE

Affected: 15.03.05.16_multi

Fixed in: no fixed release known

Safe to downgrade to: a release before 15.03.05.16_multi

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-2025-52221?

ac6 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-52221 being exploited?

CVE-2025-52221 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-2025-52221 affect?

CVE-2025-52221 affects ac6 firmware. Severity is critical (CVSS 9.8). Tenda AC6 15.03.05.16_multi is vulnerable to Buffer Overflow in the formSetCfm function via the funcname, funcpara1, and funcpara2 parameters.

How urgent is CVE-2025-52221?

Priority 53/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-4960 HIGH 8.8 MITIGATE A vulnerability was determined in Tenda AC6 15.03.05.16
CVE-2026-4961 HIGH 8.8 MITIGATE A vulnerability was identified in Tenda AC6 15.03.05.16
CVE-2026-8264 MEDIUM 6.3 MITIGATE A weakness has been identified in Tenda AC6 15.03.06.23
CVE-2026-8259 MEDIUM 4.7 MITIGATE A vulnerability has been found in Tenda AC6 2.0/15.03.06.23
CVE-2026-8265 MEDIUM 4.7 MITIGATE A security vulnerability has been detected in Tenda AC6 15.03.06.23

References

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