Is CVE-2021-43963 actively exploited?

No active exploitation of CVE-2021-43963 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-43963 be exploited remotely?

Yes. CVE-2021-43963 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-43963?

CVE-2021-43963 has a CVSS score of 8.1 (HIGH).

HOME VULNERABILITIESCVE-2021-43963

HIGH

CVE-2021-43963

CWE-200Published: December 7, 2021· Updated: Jun 17, 2026

8.1

CVSS v3.1

Official Description

An issue was discovered in Couchbase Sync Gateway 2.7.0 through 2.8.2. The bucket credentials used to read and write data in Couchbase Server were insecurely being stored in the metadata within sync documents written to the bucket. Users with read access could use these credentials to obtain write access. (This issue does not affect clusters where Sync Gateway is authenticated with X.509 client certificates. This issue also does not affect clusters where shared bucket access is not enabled on Sync Gateway.)

NVD Source

Technical Analysis

CVE-2021-43963 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 8.1.

From a weakness classification perspective (CWE-200): Information exposure vulnerabilities leak sensitive data to unauthorized actors.