CVE-2000-0268

Name: CVE-2000-0268
Creator: NVD / NIST
Published: 2000-04-20T04:00:00+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.66%

Last modified Jun 16, 2026

CVE-2000-0268 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 1.66% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

1.66%

73.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Cisco	Ios	11.3aa
Cisco	Ios	12.0\(2\)
Cisco	Ios	12.0\(2\)xc
Cisco	Ios	12.0\(2\)xd
Cisco	Ios	12.0\(2\)xf
Cisco	Ios	12.0\(2\)xg
Cisco	Ios	12.0\(3\)t2
Cisco	Ios	12.0\(4\)
Cisco	Ios	12.0\(4\)s
Cisco	Ios	12.0\(4\)t
Cisco	Ios	12.0\(5\)
Cisco	Ios	12.0\(6\)
Cisco	Ios	12.0\(7\)t
Cisco	Accesspath	ls-3
Cisco	Accesspath	ts-3
Cisco	Accesspath	vs-3
Cisco	As5200	All versions
Cisco	As5300	All versions
Cisco	As5800	All versions
Cisco	System Controller 3640	All versions
Cisco	Voice Gateway As5800	All versions
Cisco	3660 Router	All versions
Cisco	7100 Router	All versions
Cisco	7200 Router	All versions
Cisco	7500 Router	All versions
Cisco	Ubr7200	All versions

References

http://www.cisco.com/warp/public/707/iostelnetopt-pub.shtmlPatch, Vendor Advisory
http://www.osvdb.org/1289
http://www.securityfocus.com/bid/1123
http://www.cisco.com/warp/public/707/iostelnetopt-pub.shtmlPatch, Vendor Advisory
http://www.osvdb.org/1289
http://www.securityfocus.com/bid/1123

Timeline

Published: Apr 20, 2000
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2000-0268?

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.

How severe is CVE-2000-0268?

Severity scoring for CVE-2000-0268 is pending analysis. The EPSS model estimates a 1.66% probability of exploitation in the next 30 days.

How do I fix CVE-2000-0268?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2000-0268?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST