Unauthenticated Command Injection Flaws Disclosed in Totolink A7100RU and A8000RU Routers
Two high-severity vulnerabilities have been disclosed in Totolink routers that allow remote, unauthenticated OS command injection through the CGI handler in /cgi-bin/cstecgi.cgi. The flaws affect the A7100RU (CVE-2026-5853) running firmware 7.4cu.2313_b20191024 and the A8000RU (CVE-2026-7124) running firmware 7.1cu.643_b20200521, with both issues tied to the setIpv6LanCfg function and abuse of the addrPrefixLen argument. The vulnerabilities are mapped to CWE-78 and CWE-77 and can be exploited remotely without authentication or user interaction.
Timeline
Apr 27, 2026
CVE-2026-7124 disclosed for Totolink A8000RU command injection
A separate vulnerability entry for CVE-2026-7124 was recorded on 2026-04-27 affecting Totolink A8000RU firmware 7.1cu.643_b20200521. The issue is the same class of unauthenticated remote OS command injection in /cgi-bin/cstecgi.cgi setIpv6LanCfg through the addrPrefixLen parameter, with public exploit disclosure already reported.
Apr 9, 2026
CVE-2026-5853 disclosed for Totolink A7100RU command injection
A vulnerability entry for CVE-2026-5853 was recorded on 2026-04-09 affecting Totolink A7100RU firmware 7.4cu.2313_b20191024. The flaw in /cgi-bin/cstecgi.cgi setIpv6LanCfg allows unauthenticated remote OS command injection via the addrPrefixLen argument, and public disclosure was noted.
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