CVE-2021-25643

Severity: medium (CVSS 4.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-05-26 · updated 2026-06-17
Weakness: CWE-319

Description

An issue was discovered in Couchbase Server 5.x and 6.x before 6.5.2 and 6.6.x before 6.6.2. Internal users with administrator privileges, @cbq-engine-cbauth and @index-cbauth, leak credentials in cleartext in the indexer.log file when they make a /listCreateTokens, /listRebalanceTokens, or /listMetadataTokens call.

Affected products

Couchbase Server: from 5.0.0 before 6.5.2; from 6.6.0 before 6.6.2 — fixed in 6.5.2, 6.6.2

How to fix

Upgrade to a fixed version: Couchbase Server 6.5.2, 6.6.2. Check the vendor advisory for mitigations.

References

https://www.couchbase.com/resources/security#SecurityAlerts
https://www.couchbase.com/resources/security#SecurityAlerts

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