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Linux KernelOperating system · Linux

CVE-2002-0510

MEDIUM · 5.0 CVSS v2.0 Published 2002-08-12
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
The UDP implementation in Linux 2.4.x kernels keeps the IP Identification field at 0 for all non-fragmented packets, which could allow remote attackers to determine that a target system is running Linux.

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

The UDP implementation in Linux 2.4.x kernels sets the IP Identification field to 0 for all non-fragmented UDP packets, allowing remote attackers to perform OS fingerprinting and determine that a target system is running Linux by observing this distinctive behavior.

MitigationUpgrade to a patched kernel version or implement network-level filtering/traffic normalization to obscure OS fingerprinting characteristics.

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
Linux KernelOperating system
Affected:= 2.4.0= 2.4.1= 2.4.2= 2.4.3= 2.4.4= 2.4.5= 2.4.6= 2.4.7= 2.4.8= 2.4.9= 2.4.10= 2.4.11

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
Partial
Integrity
None
Availability
None

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

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 the running Linux kernel version
    Run `uname -r` or `cat /proc/version` to display the currently running kernel version
    Affected if The kernel version is 2.4.0, 2.4.1, 2.4.2, 2.4.3, 2.4.4, 2.4.5, 2.4.6, 2.4.7, 2.4.8, 2.4.9, 2.4.10, or 2.4.11
  2. Capture outbound UDP packets
    Use a packet capture tool such as tcpdump to capture outgoing UDP packets from the system: `tcpdump -i <interface> -c 10 -v udp`
    Affected if The captured UDP packets show the IP Identification (IP ID) field set to 0 in the IP header for non-fragmented packets
  3. Verify the IP ID behavior in packet headers
    Examine the captured packets in hexdump or Wireshark, focusing on the IP header fields. The IP ID is located at bytes 4-5 of the standard IPv4 header (the 16-bit Identification field)
    Affected if The Identification field in the IP header of non-fragmented UDP packets is observed to be 0x0000, which is the distinctive behavior that enables OS fingerprinting

You are affected if your system runs any of the listed kernel versions AND outbound non-fragmented UDP packets have their IP Identification field set to 0.

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

Upgrade to a patched kernel version or implement network-level filtering/traffic normalization to obscure OS fingerprinting characteristics.

Fix this in Linux Kernel Scoped from the published advisory
  • Consultation2.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
16.0 hours of engineering $2,800
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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-2002-0510 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