Vulnerability · Published Apr 13, 2026 · Assigned by VulDB
CVE-2026-6140Totolink A7100RU CGI cstecgi.cgi UploadFirmwareFile os command injection
Critical 9.8
In plain English
A critical-severity OS command injection in A7100RU from Totolink. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 2.2% (higher than 83% of all known vulnerabilities).
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)2.2%top 17.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
A vulnerability was found in Totolink A7100RU 7.4cu.2313_b20191024. This impacts the function UploadFirmwareFile of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Performing a manipulation of the argument FileName results in os command injection. The attack may be initiated remotely. The exploit has been made public and could be used.
Affected products (as reported)
Weakness: CWE-78, CWE-77 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
References
- VDB-357004 | Totolink A7100RU CGI cstecgi.cgi UploadFirmwareFile os command injection vdb-entry, technical-description
- VDB-357004 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
- Submit #792987 | Totolink A7100RU 7.4cu.2313_b20191024 Command Injection third-party-advisory
- https://github.com/Litengzheng/vuldb_new/blob/main/A7100RU/vul_193/README.md exploit
- https://www.totolink.net/ product