CVE-2025-7089: A vulnerability was found in Belkin F9K1122 1.00.33 and classified as critical. This issue affects the function formWanTcpipSetup of the file…

PriorityP273high8.8CVSS 3.1

AVNACLPRLUINSUCHIHAH

EPSS

4.13%

89.5th percentile

A vulnerability was found in Belkin F9K1122 1.00.33 and classified as critical. This issue affects the function formWanTcpipSetup of the file /goform/formWanTcpipSetup of the component webs. The manipulation of the argument pppUserName leads to stack-based buffer overflow. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
belkin	f9k1122	—	—
belkin	f9k1122_firmware	—	—

Detection & IOCsextracted from sources · hover to see the quote

path/goform/formWanTcpipSetup

commandPOST /goform/formWanTcpipSetup with body pppUserName=[100+ chars]

snort

alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS Belkin formWanTcpipSetup pppUserName Parameter Buffer Overflow Attempt (CVE-2025-7089, CVE-2025-11299)"; flow:established,to_server; http.method; content:"POST"; http.uri; bsize:25; content:"/goform/formWanTcpipSetup"; fast_pattern; http.request_body; content:"pppUserName|3d|"; pcre:"/^[^&]{100,}(?:&|$)/R"; reference:url,github.com/wudipjq/my_vuln/blob/main/Belkin/vuln_9/9.md; reference:cve,2025-7089; reference:cve,2025-11299; classtype:web-application-attack; sid:2067138; rev:1; metadata:affected_product D_Link, attack_target Networking_Equipment, tls_state plaintext, created_at 2026_01_27, cve CVE_2025_7089_CVE_2025_11299, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_01_27, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)

→Detect HTTP POST requests to the exact URI /goform/formWanTcpipSetup (URI byte-size exactly 25) targeting the webs component of Belkin F9K1122 devices.
→Inspect the HTTP request body for the parameter 'pppUserName=' (URL-encoded as pppUserName|3d|) followed by a value of 100 or more characters not containing '&', which indicates a buffer overflow attempt.
→The attack is plaintext (non-TLS) and should be monitored at the network perimeter and internally; the exploit is publicly disclosed and actively usable.
→The vulnerability is in the formWanTcpipSetup function handling the pppUserName argument, leading to a stack-based buffer overflow exploitable remotely without authentication. ↗

·The Snort/Suricata rule metadata incorrectly lists 'affected_product D_Link' — the actual affected product is Belkin F9K1122 firmware 1.00.33.
·The rule covers two CVEs simultaneously (CVE-2025-7089 and CVE-2025-11299); analysts should verify which specific CVE triggered an alert based on the targeted device model.

CVSS provenance

nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvdv4.07.4HIGHCVSS: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:X/V:X/RE:X/U:X

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

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