CVE-2026-5853 Totolink A7100RU CGI cstecgi.cgi setIpv6LanCfg os command injection
Remote attackers can execute arbitrary OS commands on Totolink A7100RU routers via the setIpv6LanCfg function in cstecgi.cgi.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-5853?
CVE-2026-5853 is a critical command injection vulnerability in Totolink A7100RU, published on 9 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A security vulnerability has been detected in Totolink A7100RU 7.4cu.2313_b20191024. Affected by this vulnerability is the function setIpv6LanCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Such manipulation of the argument addrPrefixLen leads to os command injection. The attack may be performed from remote. The exploit has been disclosed publicly and may be used.
Which versions are affected by CVE-2026-5853?
How do I fix CVE-2026-5853?
No fix has been published for CVE-2026-5853 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-5853 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5853 exists.
Sources
Also known as GHSA-hh2p-hqf4-c9m6.