CVE-2021-31400: Hcc-Embedded Nichestack

High severity, CVSS 7.5. EPSS: 1.5% chance of exploitation in the next 30 days.

An issue was discovered in tcp_pulloutofband() in tcp_in.c in HCC embedded InterNiche 4.0.1. The TCP out-of-band urgent-data processing function invokes a panic function if the pointer to the end of the out-of-band data points outside of the TCP segment's data. If the panic function hadn't a trap invocation removed, it will enter an infinite loop and therefore cause DoS (continuous loop or a device reset).

Affected products

• Hcc-Embedded Nichestack: before 4.3 (fixed in 4.3)

Published 2021-08-19. Last modified 2026-06-17.