CVE-2009-4293: Iij seil/b1

High severity, CVSS 7.1. EPSS: 1.7% chance of exploitation in the next 30 days.

Internet Initiative Japan SEIL/X1, SEIL/X2, and SEIL/B1 firmware 2.30 through 2.51, when NAT is enabled, allows remote attackers to cause a denial of service (system restart) via crafted GRE packets.

Affected products

• Iij seil/b1
• Iij seil/b1 Firmware: version 2.30 only; version 2.40 only; version 2.41 only; version 2.42 only; version 2.50 only; version 2.51 only
• Iij seil/x1
• Iij seil/x1 Firmware: version 2.30 only; version 2.40 only; version 2.41 only; version 2.42 only; version 2.50 only; version 2.51 only
• Iij seil/x2
• Iij seil/x2 Firmware: version 2.30 only; version 2.40 only; version 2.41 only; version 2.42 only; version 2.50 only; version 2.51 only

Published 2009-12-10. Last modified 2026-06-16.