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RouterHardware / appliance · Cisco

CVE-1999-0222

MEDIUM · 5.0 CVSS v2.0 Published 1999-03-01
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
59/100
Remediation priority · Elevated
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Denial of service in Cisco IOS web server allows attackers to reboot the router using a long URL.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

Denial of service vulnerability in Cisco IOS web server allows remote attackers to cause router reboot by sending a specially crafted long URL request to the embedded web server feature.

MitigationDisable the Cisco IOS HTTP server feature if not required, or upgrade to a Cisco IOS version that addresses this vulnerability. Consider implementing ACLs to restrict access to the web server interface.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
RouterHardware / appliance
Affected:all versions

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial

AV:N/AC:L/Au:N/C:N/I:N/A:P

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Verify if Cisco IOS HTTP server is enabled
    Run 'show running-config | include ip http' or 'show ip http server status' to check if the HTTP server feature is configured.
    Affected if The output shows 'ip http server' - if this line is present, the HTTP server is enabled and the system may be vulnerable.
  2. Check the Cisco IOS version
    Run 'show version' to display the installed IOS version and compare it against the affected range.
    Affected if Any version is listed as affected per the CVE (all versions).
  3. Verify HTTP server interface binding
    Run 'show ip http server' to see which interfaces the HTTP server is listening on, or check the configuration for 'ip http port' and 'ip http path' settings.
    Affected if The HTTP server is bound to an interface accessible from untrusted networks (such as WAN interfaces).

The environment is affected if the Cisco IOS HTTP server feature is enabled (ip http server is configured) and accessible from untrusted network segments.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Disable the Cisco IOS HTTP server feature if not required, or upgrade to a Cisco IOS version that addresses this vulnerability. Consider implementing ACLs to restrict access to the web server interface.

Fix this in Router Scoped from the published advisory
  • Consultation2.0 h
  • Implementation3.0 h
  • Testing2.0 h
  • Review / QA1.0 h
8.0 hours of engineering $1,420
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-1999-0222 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data