CVE-2004-1060: Multiple TCP/IP and ICMP implementations, when using Path MTU (PMTU) discovery (PMTUD), allow remote attackers

This week

MEDIUM 5.0MITIGATEMITIGATE

CVE-2004-1060 is a medium-severity flaw (CVSS 5.0) affecting icmp, tcp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple TCP/IP and ICMP implementations, when using Path MTU (PMTU) discovery (PMTUD), allow remote attackers to cause a denial of service (network throughput reduction for TCP connections) via forged ICMP ("Fragmentation Needed and Don't Fragment was Set") packets with a low next-hop MTU value, aka the "Path MTU discovery attack." NOTE: CVE-2004-0790, CVE-2004-0791, and CVE-2004-1060 have been SPLIT based on different attacks; CVE-2005-0065, C

Why this priority

EPSS top 1%: very likely to be exploited
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	74.7% (top 1%)
CISA exploited list	No
Published	2004-04-12
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: icmp · tcp

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2004-04-12 04:00 UTCPublished CVE record published
2026-06-16 22:06 UTCUpdated Record last modified

icmp icmp MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy icmp || rpm -q icmp || icmp --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

tcp tcp MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy tcp || rpm -q tcp || tcp --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Multiple Vendor ICMP Implementation - Malformed Path MTU Denial of Service
Exploit-DB: Microsoft Windows - Malformed IP Options Denial of Service (MS05-019)

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2004-1060?

icmp: mitigate or apply the listed mitigation; tcp: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2004-1060 being exploited?

CVE-2004-1060 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2004-1060 affect?

CVE-2004-1060 affects icmp, tcp. Severity is medium (CVSS 5.0). Multiple TCP/IP and ICMP implementations, when using Path MTU (PMTU) discovery (PMTUD), allow remote attackers to cause a denial of service (network throughput reduction for TCP connections) via forged ICMP ("Fragmentation Needed and Don't

How urgent is CVE-2004-1060?

Priority 47/100. EPSS top 1%: very likely to be exploited; Public exploit reference

References

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