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Vulnerability record · CVE-2025-12611 · published 3 November 2025

CVE-2025-12611: Tenda ac21 firmware memory buffer overflow vulnerability

Tenda · Ac21 Firmware

A vulnerability was identified in Tenda AC21 16.03.08.16. This vulnerability affects the function formSetPPTPServer of the file /goform/SetPptpServerCfg. The manipulation of the argument startIp leads to buffer overflow. Remote exploitation of the attack is possible. The exploit is publicly available and might be used.

7.4 CVSS 4.0 High EPSS 0.68% · top 49.4% CWE-119 · Memory buffer overflowCWE-120 · Classic buffer overflow
7.4CVSS 4.0 base score, v2 9.0
0.68%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 AC21 16.03.08.16. This vulnerability affects the function formSetPPTPServer of the file /goform/SetPptpServerCfg. The manipulation of the argument startIp leads to buffer overflow. Remote exploitation of the attack is possible. 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://github.com/LX-LX88/cve/issues/10 ExploitIssue TrackingThird Party Advisory
https://vuldb.com/?ctiid.330906 Permissions RequiredVDB Entry
https://vuldb.com/?id.330906 Third Party AdvisoryVDB Entry
https://vuldb.com/?submit.678491 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.

8.9CVE-2025-9605Tenda ac21 firmware memory buffer overflow vulnerabilityA security vulnerability has been detected in Tenda AC21 and AC23 16.03.08.16. Affected is the function GetParentControlInfo of the file /goform/GetP…EPSS 5.1%8.8CVE-2023-24333Tenda ac21 firmware code injection vulnerabilityA stack overflow vulnerability in Tenda AC21 with firmware version US_AC21V1.0re_V16.03.08.15_cn_TDC01 allows attackers to run arbitrary commands via…EPSS 0.48%7.5CVE-2022-44158Tenda ac21 firmware out-of-bounds write vulnerabilityTenda AC21 V16.03.08.15 is vulnerable to Buffer Overflow via function via set_device_name.EPSS 0.85%7.5CVE-2022-44163Tenda ac21 firmware out-of-bounds write vulnerabilityTenda AC21 V16.03.08.15 is vulnerable to Buffer Overflow via function formSetMacFilterCfg.EPSS 0.85%7.5CVE-2022-40067Tenda ac21 firmware out-of-bounds write vulnerabilityTenda AC21 V 16.03.08.15 is vulnerable to Buffer Overflow via /bin/httpd, function: formSetVirtualSer.EPSS 0.99%7.5CVE-2022-40068Tenda ac21 firmware out-of-bounds write vulnerabilityTenda AC21 V16.03.08.15 is vulnerable to Buffer Overflow via /bin/httpd, function: formSetQosBand.EPSS 0.99%7.5CVE-2022-40069Tenda ac21 firmware out-of-bounds write vulnerability]Tenda AC21 V 16.03.08.15 is vulnerable to Buffer Overflow via /bin/httpd, function: fromSetSysTime.EPSS 0.99%7.5CVE-2022-40070Tenda ac21 firmware out-of-bounds write vulnerabilityTenda AC21 V 16.03.08.15 is vulnerable to Buffer Overflow via bin/httpd, function: formSetFirewallCfg.EPSS 0.99%

Source: NIST National Vulnerability Database (record CVE-2025-12611), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.