CVE-2025-11327: A security vulnerability has been detected in Tenda AC18 15.03.05.19(6318). This vulnerability affects unknown code of the file /goform/SetUpnpCfg. The…

PriorityP268high8.8CVSS 3.1

AVNACLPRLUINSUCHIHAH

EPSS

1.15%

63.5th percentile

A security vulnerability has been detected in Tenda AC18 15.03.05.19(6318). This vulnerability affects unknown code of the file /goform/SetUpnpCfg. The manipulation of the argument upnpEn leads to stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed publicly and may be used.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
tenda	ac18	—	—
tenda	ac18_firmware	—	—

Detection & IOCsextracted from sources · hover to see the quote

urlhttps://github.com/noahze01/IoT-vulnerable/blob/main/Tenda/AC18/SetUpnpCfg.md↗

path/goform/SetUpnpCfg↗

snort

alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS Tenda SetUpnpCfg upnpEn Parameter Buffer Overflow Attempt (CVE-2025-11327)"; flow:established,to_server; http.method; content:"POST"; http.uri; bsize:18; content:"/goform/SetUpnpCfg"; fast_pattern; http.request_body; content:"upnpEn|3d|"; pcre:"/^[^&]{100,}(?:&|$)/R"; reference:url,github.com/noahze01/IoT-vulnerable/blob/main/Tenda/AC18/SetUpnpCfg.md; reference:cve,2025-11327; classtype:web-application-attack; sid:2065062; rev:1; metadata:affected_product Tenda, attack_target Networking_Equipment, tls_state plaintext, created_at 2025_10_06, cve CVE_2025_11327, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_10_06, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)

→Attack is delivered via HTTP POST to the exact URI /goform/SetUpnpCfg (URI length is exactly 18 bytes); match on this path to scope detection to the vulnerable endpoint. ↗
→The overflow is triggered through the 'upnpEn' POST body parameter (URL-encoded as 'upnpEn='); look for this parameter in the request body. ↗
→The exploit payload is characterised by the upnpEn parameter value being 100 or more characters long (before the next '&' or end of body), indicating a buffer overflow attempt. ↗
→Traffic is plaintext (not TLS); deploy detection at the network perimeter and internally on flat/IoT segments. ↗
→MITRE mapping: Initial Access (TA0001) via Exploit Public-Facing Application (T1190); prioritise perimeter-facing Tenda AC18 devices in threat-hunt scope. ↗

·Affected product is Tenda AC18 firmware version 15.03.05.19(6318) only; the vulnerable code path is within /goform/SetUpnpCfg. Confirm firmware version before applying detection to avoid false positives on other Tenda models. ↗
·The Snort/Suricata rule (SID 2065062) uses a PCRE match on the request body after the upnpEn= parameter; ensure the IDS engine supports http.request_body sticky buffer and PCRE relative matching (/R flag) to avoid rule misfires. ↗

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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