CVE-2025-9087: A vulnerability has been found in Tenda AC20 16.03.08.12. This affects the function set_qosMib_list of the file /goform/SetNetControlList of the component…

PriorityP268critical9.8CVSS 3.1

AVNACLPRNUINSUCHIHAH

EPSS

0.99%

58.3th percentile

A vulnerability has been found in Tenda AC20 16.03.08.12. This affects the function set_qosMib_list of the file /goform/SetNetControlList of the component SetNetControlList Endpoint. The manipulation of the argument list leads to stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
tenda	ac20	—	—
tenda	ac20_firmware	—	—

Detection & IOCsextracted from sources · hover to see the quote

path/goform/SetNetControlList

urlhttps://github.com/SolitaryGrass/IoT_vuln/blob/main/tenda/AC6/AC6V2.0RTL_V15.03.06.23/formSetQosBand/poc.md

snort

alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS Tenda SetNetControlList list Parameter Buffer Overflow Attempt (CVE-2025-9087, CVE-2025-29215, CVE-2025-1897)"; flow:established,to_server; http.method; content:"POST"; http.uri; bsize:25; content:"/goform/SetNetControlList"; fast_pattern; http.request_body; content:"list|3d|"; pcre:"/^[^&]{100,}(?:&|$)/R"; reference:url,github.com/SolitaryGrass/IoT_vuln/blob/main/tenda/AC6/AC6V2.0RTL_V15.03.06.23/formSetQosBand/poc.md; reference:cve,2025-29215; reference:cve,2025-9087; reference:cve,2025-1897; classtype:web-application-attack; sid:2064109; rev:1; metadata:affected_product Tenda, attack_target Networking_Equipment, tls_state plaintext, created_at 2025_08_22, cve CVE_2025_9087_CVE_2025_29215_CVE_2025_1897, 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;)

→Match HTTP POST requests to the exact URI /goform/SetNetControlList (bsize:25) with the request body containing 'list=' (list|3d|) followed by a value of 100 or more non-ampersand characters, indicating a buffer overflow attempt against the list parameter.
→The vulnerability is in the function set_qosMib_list of the file /goform/SetNetControlList; monitor for abnormally large POST body values in the 'list' parameter to this endpoint. ↗
→The attack is conducted over plaintext HTTP (not TLS); perimeter and internal network sensors should both be deployed to catch exploitation attempts.
→The exploit has been publicly disclosed; treat any POST to /goform/SetNetControlList with a large 'list' value as high-confidence exploitation (confidence High, signature_severity Major). ↗

·The Snort/Suricata rule (sid:2064109) also covers CVE-2025-29215 and CVE-2025-1897 in addition to CVE-2025-9087; tune or split the rule if per-CVE attribution is required.
·The URI content match uses an exact byte-size constraint (bsize:25); ensure the detection engine supports the bsize keyword (Suricata 4.x+) before deploying.

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.