CVE-2024-2809

published 2024-03-22

CVE-2024-2809: A vulnerability, which was classified as critical, was found in Tenda AC15 15.03.05.18/15.03.20_multi. Affected is the function formSetFirewallCfg of the file…

Priority P2 69 critical 9.8 CVSS 3.1

AV N AC L PR N UI N S U C H I H A H

A vulnerability, which was classified as critical, was found in Tenda AC15 15.03.05.18/15.03.20_multi. Affected is the function formSetFirewallCfg of the file /goform/SetFirewallCfg. The manipulation of the argument firewallEn leads to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. The identifier of this vulnerability is VDB-257664. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.

Affected

4 ranges

Vendor	Product	Version range	Fixed in
tenda	ac15	—	—
tenda	ac15	—	—
tenda	ac15_firmware	—	—
tenda	ac15_firmware	—	—

Detection & IOCs extracted from sources · hover to see the quote

url /goform/SetFirewallCfg

command firewallEn=<value of 100+ chars>

snort

alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS Tenda SetFirewallCfg firewallEn Parameter Buffer Overflow Attempt (CVE-2025-8810, CVE-2025-29358, CVE-2025-1851, CVE-2024-2809)"; flow:established,to_server; http.method; content:"POST"; http.uri; bsize:22; content:"/goform/SetFirewallCfg"; fast_pattern; http.request_body; content:"firewallEn|3d|"; pcre:"/^[^&]{100,}(?:&|$)/R"; reference:cve,2025-8810; reference:url,www.cve.org/CVERecord/SearchResults?query=SetFirewallCfg; reference:cve,2025-1851; reference:cve,2025-29358; reference:url,github.com/peris-navince/founded-0-days/blob/main/Tenda/ac8/formSetFirewallCfg/1.md; reference:cve,2024-2809; classtype:web-application-attack; sid:2065155; rev:1; metadata:affected_product Tenda, attack_target Networking_Equipment, tls_state plaintext, created_at 2025_10_10, cve CVE_2025_1851_CVE_2025_8810_CVE_2024_2809_CVE_2025_29358, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_10_10, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)

• → Exploit arrives as an HTTP POST request to the exact URI /goform/SetFirewallCfg (URI length is exactly 22 bytes); match on POST method and this URI path.
• → The overflow is triggered via the 'firewallEn' POST body parameter; look for the parameter followed by a value of 100 or more characters (not separated by '&') as the overflow payload indicator.
• → Traffic is expected in plaintext (not TLS); deploy detection at the network perimeter and internally.
• → Attack maps to MITRE ATT&CK T1190 (Exploit Public-Facing Application) under tactic TA0001 (Initial Access); correlate with other exploitation attempts against Tenda networking equipment.

• · The Snort/Suricata rule (ET sid:2065155) covers multiple CVEs beyond CVE-2024-2809 (also CVE-2025-8810, CVE-2025-29358, CVE-2025-1851); a positive alert does not uniquely confirm CVE-2024-2809 exploitation without additional context.
• · Affected firmware versions are 15.03.05.18 and 15.03.20_multi on Tenda AC15; the vendor did not respond to disclosure, so no official patch is confirmed — treat all in-scope devices as persistently vulnerable. ↗
• · The exploit has been publicly disclosed; exploitation is possible remotely without authentication, raising the urgency for network-level blocking. ↗

CVSS provenance

nvd v3.1 9.8 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd v2.0 9.0 CRITICAL AV:N/AC:L/Au:S/C:C/I:C/A:C

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