CVE-2021-29723: IBM Sterling External Authentication Server

High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days.

IBM Sterling Secure Proxy 6.0.1, 6.0.2, 2.4.3.2, and 3.4.3.2 uses weaker than expected cryptographic algorithms that could allow an attacker to decrypt highly sensitive information. IBM X-ForceID: 201100.

Affected products

• IBM Sterling External Authentication Server: version 2.4.3.2 only; version 6.0.1.0 only; version 6.0.2.0 only
• IBM Sterling Secure Proxy: version 3.4.3.2 only; version 6.0.1 only; version 6.0.2 only

Published 2021-08-30. Last modified 2026-06-17.