CVE-2025-11418: A security vulnerability has been detected in Tenda CH22 up to 1.0.0.1. This issue affects the function formWrlsafeset of the file /goform/AdvSetWrlsafeset of…

PriorityP275critical9.8CVSS 3.1

AVNACLPRNUINSUCHIHAH

EPSS

6.19%

92.7th percentile

A security vulnerability has been detected in Tenda CH22 up to 1.0.0.1. This issue affects the function formWrlsafeset of the file /goform/AdvSetWrlsafeset of the component HTTP Request Handler. The manipulation of the argument mit_ssid_index leads to stack-based buffer overflow. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used.

Affected

3 ranges

Vendor	Product	Version range	Fixed in
tenda	ch22	—	—
tenda	ch22	—	—
tenda	ch22_firmware	<= 1.0.0.1	—

Detection & IOCsextracted from sources · hover to see the quote

url/goform/AdvSetWrlsafeset↗

snort

alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS Tenda AdvSetWrlsafeset mit_ssid_index Parameter Buffer Overflow Attempt (CVE-2025-11418)"; flow:established,to_server; http.method; content:"POST"; http.uri; bsize:24; content:"/goform/AdvSetWrlsafeset"; fast_pattern; http.request_body; content:"mit_ssid_index|3d|"; pcre:"/^[^&]{100,}(?:&|$)/R"; reference:url,github.com/Sxxxw/cve/issues/2; reference:cve,2025-11418; classtype:web-application-attack; sid:2065110; rev:1; metadata:affected_product Tenda, attack_target Networking_Equipment, tls_state plaintext, created_at 2025_10_08, cve CVE_2025_11418, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_10_08, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)

bytes

mit_ssid_index=

→Look for HTTP POST requests to the exact URI /goform/AdvSetWrlsafeset (exact length 24 bytes) targeting Tenda CH22 devices.
→Flag requests where the mit_ssid_index parameter value exceeds 100 characters (no ampersand delimiter within first 100+ chars), indicating a buffer overflow attempt.
→The exploit has been publicly disclosed; reference the PoC at github.com/Sxxxw/cve/issues/2 for payload patterns.
→The vulnerability is in the formWrlsafeset function within the HTTP Request Handler component of the affected firmware. ↗

·The Snort/Suricata rule targets plaintext HTTP traffic only (tls_state plaintext); encrypted HTTPS traffic to the device will not be detected by this signature.
·The rule is scoped to inbound traffic toward $HOME_NET; ensure Tenda CH22 management interfaces are included in the HOME_NET definition for effective coverage.
·Affected firmware is Tenda CH22 up to version 1.0.0.1; devices running later versions (if patched) may still trigger the rule if no version-based filtering is applied. ↗

CVSS provenance

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

nvdv4.08.9HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/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:X/V:X/RE:X/U:X

nvdv2.010.0CRITICALAV:N/AC:L/Au:N/C:C/I:C/A:C

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