CVE-2025-49015: The Couchbase .NET SDK (client library) before 3.7.1 does not properly enable hostname verification for TLS ce

Q: How do I fix CVE-2025-49015?

.net sdk: upgrade to newer than 3.7.1. Exact commands for each OS are on this page.

Q: Is CVE-2025-49015 being exploited?

CVE-2025-49015 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-49015 affect?

CVE-2025-49015 affects .net sdk. Severity is medium (CVSS 4.9). The Couchbase .NET SDK (client library) before 3.7.1 does not properly enable hostname verification for TLS certificates. In fact, the SDK was also using IP addresses instead of hostnames due to a configuration option that was incorrectly e

Q: How urgent is CVE-2025-49015?

Priority 21/100. No elevated risk signals yet.

Routine

MEDIUM 4.9UPGRADE

CVE-2025-49015 is a medium-severity flaw (CVSS 4.9) affecting .net sdk. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Couchbase .NET SDK (client library) before 3.7.1 does not properly enable hostname verification for TLS certificates. In fact, the SDK was also using IP addresses instead of hostnames due to a configuration option that was incorrectly enabled by default.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.9 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.2% (top 86%)
CISA exploited list	No
Weakness	CWE-297
Published	2025-06-18
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

2025-06-18 14:15 UTCPublished CVE record published
2026-06-17 09:30 UTCUpdated Record last modified

couchbase .net sdk UPGRADE

Affected: <= 3.7.1

Fixed in: newer than 3.7.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy .net-sdk || rpm -q .net-sdk || .net-sdk --version

2. UPGRADE to newer than 3.7.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade .net-sdk

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade .net-sdk

Note

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

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-2025-49015?

.net sdk: upgrade to newer than 3.7.1. Exact commands for each OS are on this page.

Is CVE-2025-49015 being exploited?

CVE-2025-49015 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-2025-49015 affect?

CVE-2025-49015 affects .net sdk. Severity is medium (CVSS 4.9). The Couchbase .NET SDK (client library) before 3.7.1 does not properly enable hostname verification for TLS certificates. In fact, the SDK was also using IP addresses instead of hostnames due to a configuration option that was incorrectly e

How urgent is CVE-2025-49015?

Priority 21/100. No elevated risk signals yet.

Related CVEs

CVE-2026-58649 MEDIUM 6.5 DOWNGRADE UPGRADE Origin validation error in .NET allows an unauthorized attacker to disclose information over a network.

References

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