CVE-2025-28137
published 2025-04-15CVE-2025-28137: The TOTOLINK A810R V4.1.2cu.5182_B20201026 were found to contain a pre-auth remote command execution vulnerability in the setNoticeCfg function through the…
PriorityP185critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
ITWVulnCheck KEV
Exploited in the wild
EPSS
11.20%
95.5th percentile
The TOTOLINK A810R V4.1.2cu.5182_B20201026 were found to contain a pre-auth remote command execution vulnerability in the setNoticeCfg function through the NoticeUrl parameter.
Affected
1 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| totolink | a810r_firmware | — | — |
Detection & IOCsextracted from sources · hover to see the quote
url/cgi-bin/cstecgi.cgi
urlhttps://sudsy-eyeliner-a59.notion.site/RCE1-1ab72b8cd95f80d09eded269810f3756
snort
alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS TOTOLINK A810R setNoticeCfg NoticeUrl Parameter Command Injection Attempt"; flow:established,to_server; http.method; content:"POST"; http.uri; bsize:20; content:"/cgi-bin/cstecgi.cgi"; http.request_body; content:"|22|topicurl|22 3a 22|setting/setNoticeCfg|22|"; fast_pattern; content:"|22|NoticeUrl|22 3a 22|"; pcre:"/^[^\x26]*?(?:(?:\x3b|%3[Bb])|(?:\x0a|%0[Aa])|(?:\x60|%60)|(?:\x7c|%7[Cc])|(?:\x24|%24))+/R"; reference:url,sudsy-eyeliner-a59.notion.site/RCE1-1ab72b8cd95f80d09eded269810f3756; reference:cve,2025-28137; classtype:attempted-admin; sid:2061608; rev:1; metadata:affected_product TOTOLINK, attack_target Networking_Equipment, tls_state plaintext, created_at 2025_04_15, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, updated_at 2025_04_15, 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 /cgi-bin/cstecgi.cgi with a request body containing the JSON key 'topicurl' set to 'setting/setNoticeCfg' and a 'NoticeUrl' key whose value contains shell metacharacters (;, newline, backtick, pipe, $) — optionally URL-encoded — indicating command injection in the NoticeUrl parameter.
- →The URI path /cgi-bin/cstecgi.cgi must be exactly 20 bytes (bsize:20), which can help reduce false positives when matching this endpoint.
- →The vulnerability is pre-authentication (no session/auth required), so any unauthenticated POST to the target endpoint with the injection pattern should be treated as a high-confidence exploit attempt. ↗
- →Traffic is expected in plaintext (non-TLS); deploy detection at the network perimeter and internally.
- ·The Snort/Suricata rule (SID 2061608) targets only the specific firmware version V4.1.2cu.5182_B20201026; other TOTOLINK models or firmware versions are not confirmed affected and should not be assumed vulnerable. ↗
- ·The PCRE in the Snort rule checks for shell metacharacters after the NoticeUrl value but stops at '&' (\x26), meaning URL-encoded ampersands or multi-parameter payloads that split across fields may evade the pattern.
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vulncheck9.8CRITICAL
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GHSA
GHSA-fchw-692r-4w73: The TOTOLINK A810R V4
ghsa_unreviewed·2025-04-15
CVE-2025-28137 [CRITICAL] CWE-78 GHSA-fchw-692r-4w73: The TOTOLINK A810R V4
The TOTOLINK A810R V4.1.2cu.5182_B20201026 were found to contain a pre-auth remote command execution vulnerability in the setNoticeCfg function through the NoticeUrl parameter.
VulnCheck
totolink a810r_firmware Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
vulncheck·2025·CVSS 9.8
CVE-2025-28137 [CRITICAL] totolink a810r_firmware Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
totolink a810r_firmware Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
The TOTOLINK A810R V4.1.2cu.5182_B20201026 were found to contain a pre-auth remote command execution vulnerability in the setNoticeCfg function through the NoticeUrl parameter.
Affected: totolink a810r_firmware
Required Action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Exploitation References: https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2025-07-21&host_type=src&vulnerability=cve-2025-28137
Suricata
ET WEB_SPECIFIC_APPS TOTOLINK A810R setNoticeCfg NoticeUrl Parameter Command Injection Attempt
suricata·2025-04-15
CVE-2025-28137 ET WEB_SPECIFIC_APPS TOTOLINK A810R setNoticeCfg NoticeUrl Parameter Command Injection Attempt
ET WEB_SPECIFIC_APPS TOTOLINK A810R setNoticeCfg NoticeUrl Parameter Command Injection Attempt
Rule: alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS TOTOLINK A810R setNoticeCfg NoticeUrl Parameter Command Injection Attempt"; flow:established,to_server; http.method; content:"POST"; http.uri; bsize:20; content:"/cgi-bin/cstecgi.cgi"; http.request_body; content:"|22|topicurl|22 3a 22|setting/setNoticeCfg|22|"; fast_pattern; content:"|22|NoticeUrl|22 3a 22|"; pcre:"/^[^\x26]*?(?:(?:\x3b|%3[Bb])|(?:\x0a|%0[Aa])|(?:\x60|%60)|(?:\x7c|%7[Cc])|(?:\x24|%24))+/R"; reference:url,sudsy-eyeliner-a59.notion.site/RCE1-1ab72b8cd95f80d09eded269810f3756; reference:cve,2025-28137; classtype:attempted-admin; sid:2061608; rev:1; metadata:affected_product TOTOLINK, attack_target Networking_Equipm
No public exploits indexed.
No writeups or analysis indexed.
2025-04-15
Published
Exploited in the wild