CVE-2025-9298: A flaw has been found in Tenda M3 1.0.0.12. Affected is the function formQuickIndex of the file /goform/QuickIndex. Executing manipulation of the argument…

PriorityP266critical9.8CVSS 3.1

AVNACLPRNUINSUCHIHAH

EPSS

1.00%

58.4th percentile

A flaw has been found in Tenda M3 1.0.0.12. Affected is the function formQuickIndex of the file /goform/QuickIndex. Executing manipulation of the argument PPPOEPassword can lead to stack-based buffer overflow. The attack can be launched remotely. The exploit has been published and may be used.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
tenda	m3	—	—
tenda	m3_firmware	—	—

Detection & IOCsextracted from sources · hover to see the quote

path/goform/QuickIndex↗

snort

alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS Tenda QuickIndex PPPOEPassword Parameter Buffer Overflow Attempt (CVE-2025-9298)"; flow:established,to_server; http.method; content:"POST"; http.uri; bsize:18; content:"/goform/QuickIndex"; fast_pattern; http.request_body; content:"PPPOEPassword|3d|"; pcre:"/^[^&]{100,}(?:&|$)/R"; reference:url,github.com/davybat/IoT-Vuls/blob/main/tenda/formQuickIndex.md; reference:cve,2025-9298; classtype:web-application-attack; sid:2064099; rev:1; metadata:affected_product Tenda, attack_target Networking_Equipment, tls_state plaintext, created_at 2025_08_22, cve CVE_2025_9298, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_08_22, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)

→Exploit targets HTTP POST requests to the exact URI /goform/QuickIndex (URI byte size is exactly 18 characters); match on this URI with POST method to identify exploitation attempts.
→The overflow is triggered via the PPPOEPassword parameter in the POST body. Look for the PPPOEPassword= field (URL-encoded as PPPOEPassword|3d|) followed by a value of 100 or more characters before an ampersand or end of body.
→Traffic is expected in plaintext (not TLS); deploy detection at the network perimeter and internally on segments hosting Tenda M3 networking equipment.
→The vulnerability is in function formQuickIndex of file /goform/QuickIndex on Tenda M3 1.0.0.12; stack-based buffer overflow is triggered remotely by manipulating the PPPOEPassword argument.

·The Snort/Suricata rule (ET sid:2064099) uses a PCRE match requiring the PPPOEPassword value to be 100+ characters; legitimate PPPOEPassword values are typically short, so this threshold is designed to minimize false positives while catching overflow payloads.
·The rule targets $HOME_NET as the destination, meaning it is designed for deployments where Tenda M3 devices reside on monitored internal or perimeter networks; ensure $HOME_NET is correctly scoped to include device subnets.

CVSS provenance

nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/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

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.