CVE-2026-5677 Totolink A7100RU cstecgi.cgi CsteSystem os command injection
Remote attackers can execute arbitrary OS commands on Totolink A7100RU routers via the cstecgi.cgi interface.
- 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-2026-5677?
CVE-2026-5677 is a medium-severity command injection vulnerability in Totolink A7100RU, published on 6 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A security flaw has been discovered in Totolink A7100RU 7.4cu.2313_b20191024. Impacted is the function CsteSystem of the file /cgi-bin/cstecgi.cgi. Performing a manipulation of the argument resetFlags results in os command injection. The attack may be initiated remotely. The exploit has been released to the public and may be used for attacks.
Which versions are affected by CVE-2026-5677?
How do I fix CVE-2026-5677?
No fix has been published for CVE-2026-5677 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-2026-5677 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5677 exists.
Sources
Also known as GHSA-cx86-4pqp-3jjx.