CVE-2026-22542 DENIAL OF SERVICE FOR CONCURRENT CONNECTIONS ON TELNET
An attacker on the internal network can cause a denial of service by making two concurrent Telnet connections to EFACEC QC series devices.
- 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-2026-22542?
CVE-2026-22542 is a critical denial of service vulnerability in EFACEC QC 60/90/120, published on 7 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An attacker with access to the system's internal network can cause a denial of service on the system by making two concurrent connections through the Telnet service.
Weakness: CWE-400
Which versions are affected by CVE-2026-22542?
How do I fix CVE-2026-22542?
No fix has been published for CVE-2026-22542 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-22542 being exploited?
There is no known exploitation of CVE-2026-22542 in the wild and no public exploit code.
Sources
Also known as GHSA-gqqp-9725-vwp7.