cbcvebase.
CVE-2025-3820
published 2025-04-19

CVE-2025-3820: A vulnerability was found in Tenda W12 and i24 3.0.0.4(2887)/3.0.0.5(3644) and classified as critical. Affected by this issue is the function…

PriorityP272high8.8CVSS 3.1
AVNACLPRLUINSUCHIHAH
EPSS
8.88%
94.6th percentile
A vulnerability was found in Tenda W12 and i24 3.0.0.4(2887)/3.0.0.5(3644) and classified as critical. Affected by this issue is the function cgiSysUplinkCheckSet of the file /bin/httpd. The manipulation of the argument hostIp1/hostIp2 leads to stack-based buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used.

Affected

8 ranges
VendorProductVersion rangeFixed in
tendai24——
tendai24——
tendai24_firmware——
tendai24_firmware——
tendaw12——
tendaw12——
tendaw12_firmware——
tendaw12_firmware——

Detection & IOCsextracted from sources · hover to see the quote

url/goform/modules↗
path/bin/httpd↗
snort↗
alert http1 any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS Tenda sysUplinkCheckSet hostIp parameters Buffer Overflow Attempt (CVE-2025-3820)"; flow:established,to_server; http.method; content:"POST"; http.uri; bsize:15; content:"/goform/modules"; http.request_body; content:"sysUplinkCheckSet"; fast_pattern; content:"enable"; content:"hostIp1"; pcre:"/^\x22\x3a[^\x2c\x7d$]{100,}(?:\x2c|\x7d|$)/R"; content:"hostIp2"; reference:cve,2025-3820; reference:url,github.com/02Tn/vul/issues; classtype:web-application-attack; sid:2062205; rev:2; metadata:affected_product Tenda, attack_target Networking_Equipment, tls_state plaintext, created_at 2025_05_08, cve CVE_2025_3820, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, updated_at 2025_05_09, 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 /goform/modules with a JSON body containing 'sysUplinkCheckSet', 'enable', 'hostIp1', and 'hostIp2' fields; overflow is triggered when hostIp1 or hostIp2 value exceeds 100 characters (no comma or closing brace within that span). ↗
  • →The vulnerable function is cgiSysUplinkCheckSet inside /bin/httpd on Tenda W12 and i24 devices; stack-based buffer overflow is triggered remotely via manipulation of the hostIp1/hostIp2 arguments. ↗
  • →Traffic is expected in plaintext (TLS state: plaintext); deploy detection at the network perimeter and internally on HTTP traffic only. ↗
  • →Public exploit PoC is available; reference the GitHub issue tracker at github.com/02Tn/vul/issues for exploit samples. ↗
  • ·Affected firmware versions are specifically 3.0.0.4(2887) for Tenda W12 and 3.0.0.5(3644) for Tenda i24; ensure version-scoping if deploying detection to avoid false positives on other Tenda devices. ↗
  • ·The Snort/Suricata rule (sid:2062205) uses a URI bsize of exactly 15 bytes for /goform/modules; ensure your IDS/IPS normalises HTTP URIs before matching to avoid evasion via URL encoding or path traversal variants. ↗

CVSS provenance

nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
nvdv4.08.7HIGHCVSS: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:X/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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