HOMEVULNERABILITIESCVE-2021-42763
HIGH

CVE-2021-42763

CWE-312Published: November 2, 2021· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

Couchbase Server before 6.6.3 and 7.x before 7.0.2 stores Sensitive Information in Cleartext. The issue occurs when the cluster manager forwards a HTTP request from the pluggable UI (query workbench etc) to the specific service. In the backtrace, the Basic Auth Header included in the HTTP request, has the "@" user credentials of the node processing the UI request.

NVD Source

Technical Analysis

CVE-2021-42763 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected Vendors & Products

couchbase1 product(s)
couchbase server
Source: NVD CPE · 3 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

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

All References (4)

→
https://docs.couchbase.com/server/current/release-notes/relnotes.htmlRelease Notes · Vendor Advisory
→
https://www.couchbase.com/alertsVendor Advisory
→
https://docs.couchbase.com/server/current/release-notes/relnotes.htmlRelease Notes · Vendor Advisory
→
https://www.couchbase.com/alertsVendor Advisory

Quick Facts

CVE IDCVE-2021-42763
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-312
CISA KEVNo
Affected1 vendor(s)
PublishedNov 2, 2021

Related CVEs (CWE-312)

CVE-2021-36782
9.9
CVE-2019-18868
9.8
CVE-2019-0285
9.8
CVE-2025-30124
9.8
CVE-2008-0174
9.8
CVE-2020-15332
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-42763 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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