How severe is CVE-2025-52221?

CVE-2025-52221 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-52221 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-52221?

CVE-2025-52221 affects Tenda Ac6 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-52221?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-52221 have an EU (EUVD) identifier?

Yes. CVE-2025-52221 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-209313.

When was CVE-2025-52221 published?

CVE-2025-52221 was published on 2026-04-08 and last updated on 2026-06-17.

CVE-2025-52221

CVE-2025-52221 is a critical-severity vulnerability in Tenda Ac6 Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 0% (31st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-209313
Weakness: CWE-787
Affected product: Tenda Ac6 Firmware
Published: 2026-04-08
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2025-52221?: Tenda AC6 15.03.05.16_multi is vulnerable to Buffer Overflow in the formSetCfm function via the funcname, funcpara1, and funcpara2 parameters.
How severe is CVE-2025-52221?: CVE-2025-52221 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-52221 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-52221?: CVE-2025-52221 affects Tenda Ac6 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-52221?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-52221 have an EU (EUVD) identifier?: Yes. CVE-2025-52221 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-209313.
When was CVE-2025-52221 published?: CVE-2025-52221 was published on 2026-04-08 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:tenda:ac6_firmware:15.03.05.16_multi:*:*:*:*:*:*:*

More vulnerabilities in Tenda Ac6 Firmware

CVE-2025-27129 — Critical (CVSS 9.8): An authentication bypass vulnerability exists in the HTTP authentication functionality of Tenda AC6 V5.0 V02.03.01.110.…
CVE-2025-29031 — Critical (CVSS 9.8): Tenda AC6 v15.03.05.16 was discovered to contain a buffer overflow via the fromAddressNat function.
CVE-2025-29030 — Critical (CVSS 9.8): Tenda AC6 v15.03.05.16 was discovered to contain a buffer overflow via the formWifiWpsOOB function.
CVE-2025-29029 — Critical (CVSS 9.8): Tenda AC6 v15.03.05.16 was discovered to contain a buffer overflow via the formSetSpeedWan function.
CVE-2025-25343 — Critical (CVSS 9.8): Tenda AC6 V15.03.05.16 firmware has a buffer overflow vulnerability in the formexeCommand function.
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