What’s Vulnerable › Vulnerabilities

CVE-2000-0268

• Severity: medium (CVSS 5.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2000-04-20 · updated 2026-06-16

Description

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.

Affected products

• Cisco 3660 Router: all versions
• Cisco 7100 Router: all versions
• Cisco 7200 Router: all versions
• Cisco 7500 Router: all versions
• Cisco Accesspath: ls-3, ts-3, vs-3
• Cisco As5200: all versions
• Cisco As5300: all versions
• Cisco As5800: all versions
• Cisco IOS: 11.3aa, 12.0(2), 12.0(2)xc, 12.0(2)xd, 12.0(2)xf, 12.0(2)xg (+7)
• Cisco System Controller 3640: all versions
• Cisco Ubr7200: all versions
• Cisco Voice Gateway As5800: all versions

References

• http://www.cisco.com/warp/public/707/iostelnetopt-pub.shtml
• http://www.osvdb.org/1289
• http://www.securityfocus.com/bid/1123
• http://www.cisco.com/warp/public/707/iostelnetopt-pub.shtml
• http://www.osvdb.org/1289
• http://www.securityfocus.com/bid/1123

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