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Vulnerability record · CVE-2026-4961 · published 27 March 2026

CVE-2026-4961: Tenda ac6 firmware memory buffer overflow vulnerability

Tenda · Ac6 Firmware

A vulnerability was identified in Tenda AC6 15.03.05.16. Affected by this vulnerability is the function formQuickIndex of the file /goform/QuickIndex of the component POST Request Handler. The manipulation of the argument PPPOEPassword leads to stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit is publicly available and might be used.

7.4 CVSS 4.0 High EPSS 1.0% · top 38.4% CWE-119 · Memory buffer overflowCWE-121 · Stack-based buffer overflow
7.4CVSS 4.0 base score, v2 9.0
1.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References, 1 tagged exploit
17 Jun 2026Last modified by NVD

Description

A vulnerability was identified in Tenda AC6 15.03.05.16. Affected by this vulnerability is the function formQuickIndex of the file /goform/QuickIndex of the component POST Request Handler. The manipulation of the argument PPPOEPassword leads to stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit is publicly available and might be used.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

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

References

LinkTags
https://lavender-bicycle-a5a.notion.site/Tenda-AC6-QuickIndex-32053a41781f80758e27fa4259ec80cf?source=copy_link ExploitThird Party Advisory
https://vuldb.com/?ctiid.353838 Permissions RequiredVDB Entry
https://vuldb.com/?id.353838 Third Party AdvisoryVDB Entry
https://vuldb.com/?submit.777617 Third Party AdvisoryVDB Entry
https://www.tenda.com.cn/ Product

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Related vulnerabilities

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

9.8CVE-2025-52221Tenda ac6 firmware out-of-bounds write vulnerabilityTenda AC6 15.03.05.16_multi is vulnerable to Buffer Overflow in the formSetCfm function via the funcname, funcpara1, and funcpara2 parameters.EPSS 0.39%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%

Source: NIST National Vulnerability Database (record CVE-2026-4961), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.