CVE-2021-33027: Sylabs Singularity

Critical severity, CVSS 9.8. EPSS: 1.3% chance of exploitation in the next 30 days.

Sylabs Singularity Enterprise through 1.6.2 has Insufficient Entropy in a nonce.

Affected products

• Sylabs Singularity: from 1.2.0, before 1.2.6 (fixed in 1.2.6); from 1.3.0, before 1.3.4 (fixed in 1.3.4); from 1.4.0, before 1.4.4 (fixed in 1.4.4); from 1.5.0, before 1.5.4 (fixed in 1.5.4); from 1.6.0, before 1.6.3 (fixed in 1.6.3)

Published 2021-07-19. Last modified 2026-06-17.