CVE-2021-35943: Couchbase Server

Critical severity, CVSS 9.8. EPSS: 1.1% chance of exploitation in the next 30 days.

Couchbase Server 6.5.x and 6.6.x through 6.6.2 has Incorrect Access Control. Externally managed users are not prevented from using an empty password, per RFC4513.

Affected products

• Couchbase Couchbase Server: from 6.5.0, up to and including 6.5.2; from 6.6.0, before 6.6.3 (fixed in 6.6.3)

Published 2021-09-29. Last modified 2026-06-17.