CVE-2000-0268

Medium

Published: 20/04/2000(UTC)Updated: 16/06/2026(UTC)Translated: 18/06/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Elevated risk

1.66%

74th percentile - higher than 74% of all known CVEs

Summary

Cisco IOS versions 11.x and 12.x allow remote attackers to cause a denial of service by sending the ENVIRON option to the Telnet daemon before it is ready, resulting in a system reboot.

Risk Assessment

Attackers can exploit this vulnerability to disrupt system operations, potentially leading to downtime in network services.

Recommendation

It is recommended to update Cisco IOS to the latest version to mitigate this vulnerability and to monitor logs for potential attack attempts.

Original NVD description (English source)

Cisco IOS 11.x and 12.x allows remote attackers to cause a denial of service by sending the ENVIRON option to the Telnet daemon before it is ready to accept it, which causes the system to reboot.