CVE-2021-20376: IBM Sterling b2b Integrator

Medium severity, CVSS 4.3. EPSS: 0.7% chance of exploitation in the next 30 days.

IBM Sterling File Gateway 2.2.0.0 through 6.1.1.0 could allow an authenticated attacker to enumerate usernames due to there being an observable discrepancy in returned messages. IBM X-Force ID: 195568.

Affected products

• IBM Sterling b2b Integrator: from 2.2.0.0, up to and including 5.2.6.5_3; from 6.0.0.0, up to and including 6.0.3.4; from 6.1.0.0, up to and including 6.1.0.1

Published 2021-10-07. Last modified 2026-06-17.