CVE-2005-4257: Linksys BEFW11S4

High severity, CVSS 7.8. EPSS: 1.4% chance of exploitation in the next 30 days.

Linksys WRT54GS and BEFW11S4 allows remote attackers to cause a denial of service (device crash) via an IP packet with the same source and destination IPs and ports, and with the SYN flag set (aka LAND). NOTE: the provenance of this issue is unknown; the details are obtained solely from the BID.

Affected products

• Linksys BEFW11S4: version 1.4.2.7 only; version 1.4.3 only; version 1.43.3 only; version 1.44 only
• Linksys BEFW11S4 v3: any version
• Linksys BEFW11S4 v4: any version
• Linksys WRT54GS: version 4.50.6 only; version 4.70.6 only

Published 2005-12-15. Last modified 2026-06-16.