Vulnerability · Published Jan 7, 2026 · Assigned by S21sec
CVE-2026-22542DENIAL OF SERVICE FOR CONCURRENT CONNECTIONS ON TELNET
Critical 9.2
In plain English
A critical-severity uncontrolled resource consumption in QC 60/90/120 from EFACEC. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities).
Severity (CVSS 4.0)9.2Critical
Exploit odds (30 days)0.4%top 69.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| EFACEC | QC 60/90/120 | 8 |
Weakness: CWE-400 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H