CVE-2004-1060 describes a vulnerability in multiple TCP/IP and ICMP implementations that use Path MTU Discovery (PMTUD). Remote attackers can exploit this by sending forged ICMP 'Fragmentation Needed and Don't Fragment was Set' packets with an artificially low next-hop MTU value. This manipulates the PMTUD process, causing the affected system to reduce the TCP segment size unnecessarily, leading to degraded network throughput for TCP connections. The vulnerability arises from insufficient validation of ICMP messages in the PMTUD process.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No valid public exploits. Mallory filtered out 2 candidates as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
No public activity tracked yet. Mallory keeps watching.
No public activity observed for this vulnerability.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
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