CVE-2021-25644Network attack vector

Credential disclosure via unredacted REST error logging

Published May 19, 2021 · Updated Aug 3, 2024

Cleartext credential exposure in Couchbase Server 5.x through 6.6.1 and 7.0.0 Beta allows remote attackers to leak authentication data. When a REST endpoint receives an unknown request, the server records its unredacted Base64-encoded authentication information in debug.log and info.log and repeats the error in the Logs UI. An administrator with access to those logs or the UI can read the exposed credentials; the documented consequence excludes data modification and service interruption.

CVSS severity7.5
High
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cleartext credential exposure in Couchbase Server 5.x through 6.6.1 and 7.0.0 Beta allows remote attackers to leak authentication data. When a REST endpoint receives an unknown request, the server records its unredacted Base64-encoded authentication information in debug.log and info.log and repeats the error in the Logs UI. An administrator with access to those logs or the UI can read the exposed credentials; the documented consequence excludes data modification and service interruption.

The record

CVE
CVE-2021-25644
Published
May 19, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-312, T1552.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 19, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5INCIBE-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.0INCIBE-CERTAV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-312Cleartext Storage of Sensitive Information
T1552.001Unsecured Credentials: Credentials In Files

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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