Back

CVE-2005-0065

The original design of TCP does not check that the TCP sequence number in an ICMP error message is within the range of sequence numbers for data that has been sent but not acknowledged (aka "TCP sequence number checking"), which makes it easier for attackers to forge ICMP error messages for specific TCP connections and cause a denial of service, as demonstrated using (1) blind connection-reset attacks with forged "Destination Unreachable" messages, (2) blind throughput-reduction attacks with forged "Source Quench" messages, or (3) blind throughput-reduction attacks with forged ICMP messages that cause the Path MTU to be reduced. NOTE: CVE-2004-0790, CVE-2004-0791, and CVE-2004-1060 have been SPLIT based on different attacks; CVE-2005-0065, CVE-2005-0066, CVE-2005-0067, and CVE-2005-0068 are related identifiers that are SPLIT based on the underlying vulnerability. While CVE normally SPLITs based on vulnerability, the attack-based identifiers exist due to the variety and number of affected implementations and solutions that address the attacks instead of the underlying vulnerabilities.

Published: May 2, 2005 Modified: Jun 16, 2026

CVSS Metrics

Affected Products (1)

Vendor Product Version
tcp tcp *

GitHub Security Advisory GHSA-whr2-cjwc-wj5g

The original design of TCP does not check that the TCP sequence number in an ICMP error message...

Risk Scores

CVSS Score 10.0 / 10
EPSS Score 1.94%

Top 22% most likely to be exploited

Threat Score 40.6 / 100

Data Sources

NVD EPSS GitHub