What’s Vulnerable › Vulnerabilities

CVE-2021-35943

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-09-29 · updated 2026-06-17
• Weakness: CWE-287

Description

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 Server: from 6.5.0 through 6.5.2; from 6.6.0 before 6.6.3 — fixed in 6.6.3

How to fix

Upgrade to a fixed version: Couchbase Server 6.6.3. Check the vendor advisory for mitigations.

References

• https://docs.couchbase.com/server/current/release-notes/relnotes.html
• https://www.couchbase.com/alerts
• https://docs.couchbase.com/server/current/release-notes/relnotes.html
• https://www.couchbase.com/alerts

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