CVE-2020-23921: Fast Ber Project Fast Ber

High severity, CVSS 7.1. EPSS: 0.9% chance of exploitation in the next 30 days.

An issue was discovered in fast_ber through v0.4. yy::yylex() in asn_compiler.hpp has a heap-based buffer over-read.

Affected products

• Fast Ber Project Fast Ber: up to and including 0.4

Published 2021-04-21. Last modified 2026-06-17.