CVE-2000-0268: n/a vulnerability

CVE-2000-0268: Cisco IOS 11.x and 12.x allows remote attackers to cause a denial of service by sending the ENVIRON option...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 8, 2024, 05:14 UTC (UTC+00:00)

Security readout for executives and security teams

This issue can let a remote attacker reboot vulnerable Cisco IOS devices by abusing Telnet option handling. For a business, the impact is service disruption: routers or switches may restart and interrupt network availability. The provided sources do not confirm active exploitation or a specific patch level. Exposure is most likely where Cisco IOS 11.x or 12.x devices have Telnet enabled, especially if reachable from untrusted networks. Prioritize exposed network infrastructure because a reboot can disrupt routing and business connectivity. Treat urgency as highest for internet-reachable or broadly reachable Telnet services. Mitigation focus: Review Cisco advisory 20000420 for official affected and fixed version guidance.; Inventory Cisco IOS 11.x and 12.x devices with Telnet enabled.; Restrict Telnet management access to trusted administration networks..

Prepared: Jul 12, 2026, 04:54 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Jun 2, 2000, 04:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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1Source links

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Source materials

CVE List V5 sourceCVE List V5

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

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Weakness

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