CVE-2023-43768: An issue was discovered in Couchbase Server 6.6.x through 7.2.0, before 7.1.5 and 7.2.1

This month

HIGH 7.5REMOTEUPGRADE

CVE-2023-43768 is a high-severity flaw (CVSS 7.5) affecting couchbase server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in Couchbase Server 6.6.x through 7.2.0, before 7.1.5 and 7.2.1. Unauthenticated users may cause memcached to run out of memory via large commands.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 45%)
CISA exploited list	No
Weakness	CWE-770
Published	2024-03-27
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: couchbase

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-03-27 07:15 UTCPublished CVE record published
2026-06-17 06:26 UTCUpdated Record last modified

couchbase couchbase server UPGRADE

Affected: >= 6.6.0 and < 7.1.5 · 7.2.0

Fixed in: 7.1.5

Safe to downgrade to: a release before 6.6.0

1. Check installed version

apt-cache policy couchbase-server || rpm -q couchbase-server || couchbase-server --version

2. UPGRADE to 7.1.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade couchbase-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade couchbase-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 6.6.0 (Debian / Ubuntu)

apt-cache madison couchbase-server sudo apt install couchbase-server=<VERSION_BEFORE_6.6.0> sudo apt-mark hold couchbase-server

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list couchbase-server sudo dnf downgrade couchbase-server-<VERSION_BEFORE_6.6.0> sudo dnf versionlock add couchbase-server

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-43768?

couchbase server: upgrade to 7.1.5. Exact commands for each OS are on this page.

Is CVE-2023-43768 being exploited?

CVE-2023-43768 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-43768 affect?

CVE-2023-43768 affects couchbase server. Severity is high (CVSS 7.5). An issue was discovered in Couchbase Server 6.6.x through 7.2.0, before 7.1.5 and 7.2.1. Unauthenticated users may cause memcached to run out of memory via large commands.

How urgent is CVE-2023-43768?

Priority 45/100. High severity; Remotely exploitable, no login, no user action

Software pages

Memcached vulnerabilities

Related CVEs

CVE-2025-46619 HIGH 7.6 UPGRADE A security issue has been discovered in Couchbase Server before 7.6.4 and fixed in v.7.6.4 and v.7.2.7 for Win
CVE-2024-56178 MEDIUM 6.5 UPGRADE An issue was discovered in Couchbase Server 7.6.x through 7.6.3
CVE-2024-37034 MEDIUM 5.9 UPGRADE An issue was discovered in Couchbase Server before 7.2.5 and 7.6.0 before 7.6.1
CVE-2024-25673 MEDIUM 6.1 UPGRADE Couchbase Server 7.6.x before 7.6.2, 7.2.x before 7.2.6, and all earlier versions allows HTTP Host header inje
CVE-2024-23302 HIGH 7.5 UPGRADE Couchbase Server before 7.2.4 has a private key leak in goxdcr.log.

References

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