CVE-2020-17437: Open-Iscsi Project Open-Iscsi

High severity, CVSS 8.2. EPSS: 2.8% chance of exploitation in the next 30 days.

An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products. When the Urgent flag is set in a TCP packet, and the stack is configured to ignore the urgent data, the stack attempts to use the value of the Urgent pointer bytes to separate the Urgent data from the normal data, by calculating the offset at which the normal data should be present in the global buffer. However, the length of this offset is not checked; therefore, for large values of the Urgent pointer bytes, the data pointer can point to memory that is way beyond the data buffer in uip_process in uip.c.

Affected products

• Open-Iscsi Project Open-Iscsi: up to and including 2.1.7
• Siemens Sentron 3va COM100 Firmware: before 4.4.1 (fixed in 4.4.1)
• Siemens Sentron 3va COM800 Firmware: before 4.4.1 (fixed in 4.4.1)
• Siemens Sentron 3va DSP800 Firmware: before 4.0 (fixed in 4.0)
• Siemens Sentron PAC2200 Clp Firmware: affected versions not specified
• Siemens Sentron PAC2200 Firmware: before 3.2.2 (fixed in 3.2.2)
• Siemens Sentron PAC3200 Firmware: before 2.4.7 (fixed in 2.4.7)
• Siemens Sentron PAC3200T Firmware: before 3.2.2 (fixed in 3.2.2)
• Siemens Sentron PAC3220 Firmware: before 3.2.0 (fixed in 3.2.0)
• Siemens Sentron PAC4200 Firmware: before 2.3.0 (fixed in 2.3.0)
• Uip Project Uip: up to and including 1.0

Published 2020-12-11. Last modified 2026-06-17.