CVE-2020-12647: Unisys Algol Compiler

High severity, CVSS 8.8. EPSS: 0.4% chance of exploitation in the next 30 days.

Unisys ALGOL Compiler 58.1 before 58.1a.15, 59.1 before 59.1a.9, and 60.0 before 60.0a.5 can emit invalid code sequences under rare circumstances related to syntax. The resulting code could, for example, trigger a system fault or adversely affect confidentiality, integrity, and availability.

Affected products

• Unisys Algol Compiler: from 58.1, before 58.1a.15 (fixed in 58.1a.15); from 59.1, before 59.1a.9 (fixed in 59.1a.9); from 60.0, before 60.0a.5 (fixed in 60.0a.5)

Published 2020-05-21. Last modified 2026-06-17.