CVE-2025-3693: A vulnerability was found in Tenda W12 3.0.0.5. It has been rated as critical. Affected by this issue is the function cgiWifiRadioSet of the file /bin/httpd…

PriorityP268critical9.8CVSS 3.1

AVNACLPRNUINSUCHIHAH

EPSS

5.06%

91.3th percentile

A vulnerability was found in Tenda W12 3.0.0.5. It has been rated as critical. Affected by this issue is the function cgiWifiRadioSet of the file /bin/httpd. The manipulation leads to stack-based buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
tenda	w12	—	—
tenda	w12_firmware	—	—

Detection & IOCsextracted from sources · hover to see the quote

url/goform/modules

path/bin/httpd

snort

alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS Tenda wifiRadioSetIndoor extChannel parameter Buffer Overflow Attempt (CVE-2025-3693)"; flow:established,to_server; http.method; content:"POST"; http.uri; bsize:15; content:"/goform/modules"; http.request_body; content:"wifiRadioSetIndoor"; fast_pattern; content:"extChannel"; pcre:"/^\x22\x3a[^\x2c\x7d$]{100,}(?:\x2c|\x7d|$)/R"; reference:cve,2025-3693; reference:url,github.com/02Tn/vul/issues; classtype:web-application-attack; sid:2062208; rev:2; metadata:affected_product Tenda, attack_target Networking_Equipment, tls_state plaintext, created_at 2025_05_08, cve CVE_2025_3693, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, updated_at 2025_05_09, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)

→Exploit traffic uses HTTP POST method targeting the URI /goform/modules (exact length 15 bytes) with request body containing both 'wifiRadioSetIndoor' and 'extChannel' parameters.
→The overflow payload in the extChannel parameter value is detectable as an oversized JSON value (100+ characters) immediately following a colon-quote sequence, matched by PCRE: /^\x22\x3a[^\x2c\x7d$]{100,}(?:\x2c|\x7d|$)/R
→The vulnerability resides in the cgiWifiRadioSet function within /bin/httpd on Tenda W12 firmware 3.0.0.5; focus reverse-engineering and dynamic analysis efforts on this function.
→Attack is plaintext (non-TLS) and remotely exploitable; deploy the Snort/Suricata rule at network perimeter and internal segments.

·The Snort/Suricata rule uses a strict URI bsize of 15 bytes for /goform/modules; ensure the rule engine supports the bsize keyword correctly, otherwise the URI match may not fire as expected.
·The PCRE anchor /R (relative) is used after the extChannel content match; confirm your IDS/IPS version supports relative PCRE anchoring to avoid false negatives.

CVSS provenance

nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvdv4.08.7HIGHCVSS: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:X/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:X/V:X/RE:X/U:X

nvdv2.09.0CRITICALAV:N/AC:L/Au:S/C:C/I:C/A:C

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.