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Vulnerability record · CVE-2025-52221 · published 8 April 2026

CVE-2025-52221: Tenda ac6 firmware out-of-bounds write vulnerability

Tenda · Ac6 Firmware

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

9.8 CVSS 3.1 Critical EPSS 0.39% · top 69.6% CWE-787 · Out-of-bounds writeCWE-120 · Classic buffer overflow
9.8CVSS 3.1 base score
0.39%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 1 tagged exploit
25 Jul 2026Last modified by NVD

Description

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/faqiadegege/IoTVuln/blob/main/tendaAc6_formSetCfm_funcname_overflow/detail.md ExploitThird Party Advisory
https://github.com/xiaotea/iot-vulnerability-collection/blob/main/README.md Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2025-31355Tenda ac6 firmware download of code without integrity check vulnerabilityA firmware update vulnerability exists in the Firmware Signature Validation functionality of Tenda AC6 V5.0 V02.03.01.110. A specially crafted malici…EPSS 0.30%9.8CVE-2025-32010Tenda ac6 firmware stack-based buffer overflow vulnerabilityA stack-based buffer overflow vulnerability exists in the Cloud API functionality of Tenda AC6 V5.0 V02.03.01.110. A specially crafted HTTP response …EPSS 0.69%9.8CVE-2025-24322Tenda ac6 firmware vulnerabilityAn unsafe default authentication vulnerability exists in the Initial Setup Authentication functionality of Tenda AC6 V5.0 V02.03.01.110. A specially …EPSS 0.57%9.8CVE-2025-27129Tenda ac6 firmware authentication bypass via alternate path vulnerabilityAn authentication bypass vulnerability exists in the HTTP authentication functionality of Tenda AC6 V5.0 V02.03.01.110. A specially crafted HTTP requ…EPSS 2.1%9.8CVE-2025-29030Tenda ac6 firmware out-of-bounds write vulnerabilityTenda AC6 v15.03.05.16 was discovered to contain a buffer overflow via the formWifiWpsOOB function.EPSS 0.48%9.8CVE-2025-29031Tenda ac6 firmware out-of-bounds write vulnerabilityTenda AC6 v15.03.05.16 was discovered to contain a buffer overflow via the fromAddressNat function.EPSS 0.48%9.8CVE-2025-29029Tenda ac6 firmware out-of-bounds write vulnerabilityTenda AC6 v15.03.05.16 was discovered to contain a buffer overflow via the formSetSpeedWan function.EPSS 0.48%9.8CVE-2025-25343Tenda ac6 firmware classic buffer overflow vulnerabilityTenda AC6 V15.03.05.16 firmware has a buffer overflow vulnerability in the formexeCommand function.EPSS 0.71%

Source: NIST National Vulnerability Database (record CVE-2025-52221), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.