CVE-2020-4462: IBM Sterling External Authentication Server

High severity, CVSS 8.2. EPSS: 3.2% chance of exploitation in the next 30 days.

IBM Sterling External Authentication Server 6.0.1, 6.0.0, 2.4.3.2, and 2.4.2 and IBM Sterling Secure Proxy 6.0.1, 6.0.0, 3.4.3, and 3.4.2 are vulnerable to an XML External Entity Injection (XXE) attack when processing XML data. A remote attacker could exploit this vulnerability to expose sensitive information or consume memory resources. IBM X-Force ID: 181482.

Affected products

• IBM Sterling External Authentication Server: version 2.4.2.0 only; version 2.4.3.2 only; version 6.0.0.0 only; version 6.0.1.0 only
• IBM Sterling Secure Proxy: version 3.4.2.0 only; version 3.4.3.0 only; version 6.0.0.0 only; version 6.0.1.0 only

Published 2020-07-16. Last modified 2026-06-17.