CVE-2000-0380

What it is

The IOS HTTP service in Cisco routers and switches running IOS 11.1 through 12.1 allows remote attackers to cause a denial of service by requesting a URL that contains a %% string.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

35.0% chance of exploitation in the next 30 days (EPSS). Higher than most.

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2000-04-26 04:00 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 21:51 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 35.0% in the next 30 days (EPSS).
• Severity: 7.1 HIGH (CVSS).
• Fix: none linked yet, which raises it.

Details

Published

2000-04-26 04:00 UTC

Last modified

2026-06-16 21:51 UTC

Exploit probability

35.0% · EPSS, next 30 days

Weakness

CWE-20 · Improper input validation

Record status

Modified

Affected

• Cisco iOS 11.1
• Cisco iOS 11.2
• Cisco iOS 11.2\(4\)f1
• Cisco iOS 11.2\(8\)
• Cisco iOS 11.2\(8\)p
• Cisco iOS 11.2\(9\)p
• Cisco iOS 11.2\(9\)xa
• Cisco iOS 11.2\(10\)

Attack profile CVSS 2.0 · 7.1

Attack vector

Network

Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2000-0380.md and follow it. Check whether this project is affected by CVE-2000-0380. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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