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Unrated severityNVD Advisory· Published Jul 24, 2001· Updated Apr 16, 2026

CVE-2001-1097

CVE-2001-1097

Description

Cisco IOS 12.0 through 12.2.1 is vulnerable to denial of service via UDP packet floods, potentially requiring a manual reset.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Cisco IOS 12.0 through 12.2.1 is vulnerable to denial of service via UDP packet floods, potentially requiring a manual reset.

Vulnerability

A denial of service vulnerability exists in Cisco IOS versions 12.0 through 12.2.1. The issue occurs when a large volume of UDP packets are sent to the affected devices.

Exploitation

An attacker can exploit this vulnerability by sending a flood of UDP packets to a vulnerable Cisco device. Network access is required to send these packets.

Impact

Successful exploitation of this vulnerability causes the affected Cisco device to consume all available CPU resources, leading to an unresponsive state. In severe cases, a manual reset of the device may be required.

Mitigation

No specific patch information is available in the provided references. Users are advised to consult Cisco for potential workarounds or updated firmware. The affected versions are Cisco IOS 12.0 through 12.2.1 [1].

References
  1. Cisco IOS 12 - UDP Denial of Service

AI Insight generated on Jun 2, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.

Affected products

11
  • Cisco Systems, Inc./Cisco iOS11 versions
    cpe:2.3:o:cisco:ios:12.0:*:*:*:*:*:*:*+ 10 more
    • cpe:2.3:o:cisco:ios:12.0:*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:ios:12.0\(1\):*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:ios:12.0\(2\):*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:ios:12.0\(3\):*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:ios:12.0\(4\):*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:ios:12.0\(5\):*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:ios:12.0\(6\):*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:ios:12.0\(7\)t:*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:ios:12.1:*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:ios:12.2:*:*:*:*:*:*:*
    • (no CPE)range: 12.0 - 12.2.1

Patches

0

No patches discovered yet.

Vulnerability mechanics

No source-code context for this CVE — mechanics is only generated when we can read the actual fix diff. Without that, the four sections (root cause, attack vector, affected code, fix) would be speculation rather than analysis.

References

4

News mentions

0

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