CVE-2025-13288: A security vulnerability has been detected in Tenda CH22 1.0.0.1. This impacts the function fromPptpUserSetting of the file /goform/PPTPUserSetting. The…

PriorityP263high8.8CVSS 3.1

AVNACLPRLUINSUCHIHAH

EPSS

0.80%

52.4th percentile

A security vulnerability has been detected in Tenda CH22 1.0.0.1. This impacts the function fromPptpUserSetting of the file /goform/PPTPUserSetting. The manipulation of the argument delno leads to buffer overflow. The attack is possible to be carried out remotely. The exploit has been disclosed publicly and may be used.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
tenda	ch22	—	—
tenda	ch22_firmware	—	—

Detection & IOCsextracted from sources · hover to see the quote

path/goform/PPTPUserSetting

snort

alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS Tenda PPTPUserSetting delno Parameter Buffer Overflow Attempt (CVE-2025-13288)"; flow:established,to_server; http.method; content:"POST"; http.uri; bsize:23; content:"/goform/PPTPUserSetting"; fast_pattern; http.request_body; content:"delno|3d|"; pcre:"/^[^&]{100,}(?:&|$)/R"; reference:url,github.com/yyyy1g/CVE/issues/1; reference:cve,2025-13288; classtype:web-application-attack; sid:2065797; rev:1; metadata:affected_product Tenda, attack_target Networking_Equipment, tls_state plaintext, created_at 2025_11_17, cve CVE_2025_13288, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_11_17, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)

→Attack targets HTTP POST requests to /goform/PPTPUserSetting with the 'delno' parameter value exceeding 100 characters (buffer overflow trigger). The URI path is exactly 23 bytes.
→The exploit is delivered over plaintext HTTP (not TLS), targeting the device's web management interface from any external source to the home/internal network.
→The vulnerability resides in the function fromPptpUserSetting of the file /goform/PPTPUserSetting; the 'delno' argument is the specific manipulated parameter. ↗
→Public exploit PoC is available at github.com/yyyy1g/CVE/issues/1 and should be used to validate detection coverage. ↗

·The Snort/Suricata rule (sid:2065797) uses a PCRE match requiring the 'delno' value to be 100+ characters with no '&' separator — tune the threshold if legitimate long values are observed in your environment.
·The rule is scoped to plaintext HTTP only; if the Tenda CH22 management interface is ever proxied over TLS, the rule will not fire.

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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