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OpenBSDOperating system

CVE-2007-0343

MEDIUM · 5.0 CVSS v2.0 Published 2007-01-18
Fix available
A fix is available. Upgrade to after 4.0 or later.
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
OpenBSD before 20070116 allows remote attackers to cause a denial of service (infinite loop and CPU consumption) via certain IPv6 ICMP (aka ICMP6) echo request packets.

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 · high confidence

OpenBSD before January 16, 2007 contains a vulnerability in its IPv6 ICMP (ICMP6) echo request handling code. Remote attackers can send specially crafted ICMP6 echo request packets to trigger an infinite loop in the kernel, causing excessive CPU consumption and resulting in a denial of service.

MitigationUpgrade OpenBSD to a version released after 20070116 that includes the IPv6 ICMP fix, or disable IPv6 networking if not required.

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
OpenBSDOperating system
Affected:<= 4.0

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. Check OpenBSD version
    Run 'uname -a' or 'sysctl kern.version' to display the kernel version and release date
    Affected if The version displayed is 4.0 or earlier, or the release date is before January 16, 2007
  2. Verify IPv6 is enabled
    Run 'ifconfig -a' and look for 'inet6' addresses, or check 'sysctl net.inet6.ip6.forwarding' to see IPv6 operational status
    Affected if IPv6 is actively configured or running (inet6 addresses present or ip6.forwarding shows a value) - the flaw only affects systems with IPv6 enabled
  3. Check ICMP6 echo service
    Verify the system responds to ICMP6 echo requests by examining if the icmp6 kernel subsystem is active - this is default behavior in affected versions
    Affected if The system has IPv6 enabled and responds to ping6 requests from the network - the vulnerability is triggered by incoming ICMP6 echo request packets

A system is affected if it runs OpenBSD version 4.0 or earlier AND has IPv6 networking enabled and accessible from untrusted networks.

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
Upgrade available Upgrade to a release after 4.0
Interim mitigation

Upgrade OpenBSD to a version released after 20070116 that includes the IPv6 ICMP fix, or disable IPv6 networking if not required.

Fix this in OpenBSD Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA1.0 h
10.0 hours of engineering $1,750
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,800.

Scan for this in your stack

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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-2007-0343 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