How severe is CVE-2020-9039?

CVE-2020-9039 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-9039 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-9039?

CVE-2020-9039 primarily affects Couchbase Couchbase Server. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-9039?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2020-9039 published?

CVE-2020-9039 was published on 2020-02-22 and last updated on 2026-06-17.

CVE-2020-9039

CVE-2020-9039 is a critical-severity vulnerability in Couchbase Couchbase Server with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-276.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 4% (89th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-276
Affected product: Couchbase Couchbase Server
Published: 2020-02-22
Last modified: 2026-06-17

Description

Couchbase Server 4.0.0, 4.1.0, 4.1.1, 4.5.0, 4.5.1, 4.6.0 through 4.6.5, 5.0.0, 5.1.1, 5.5.0 and 5.5.1 have Insecure Permissions for the projector and indexer REST endpoints (they allow unauthenticated access).The /settings REST endpoint exposed by the projector process is an endpoint that administrators can use for various tasks such as updating configuration and collecting performance profiles. The endpoint was unauthenticated and has been updated to only allow authenticated users to access these administrative APIs.

Frequently asked questions

What is CVE-2020-9039?: Couchbase Server 4.0.0, 4.1.0, 4.1.1, 4.5.0, 4.5.1, 4.6.0 through 4.6.5, 5.0.0, 5.1.1, 5.5.0 and 5.5.1 have Insecure Permissions for the projector and indexer REST endpoints (they allow unauthenticated access).The /settings REST endpoint exposed by the projector process is an endpoint that administrators can use for various tasks such as updating configuration and collecting performance profiles. The endpoint was unauthenticated and has been updated to only allow authenticated users to access these administrative APIs.
How severe is CVE-2020-9039?: CVE-2020-9039 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-9039 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-9039?: CVE-2020-9039 primarily affects Couchbase Couchbase Server. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-9039?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2020-9039 published?: CVE-2020-9039 was published on 2020-02-22 and last updated on 2026-06-17.

References

https://www.couchbase.com/resources/security#SecurityAlerts

Affected products (10)

cpe:2.3:a:couchbase:couchbase_server:*:*:*:*:*:*:*:*
cpe:2.3:a:couchbase:couchbase_server:4.0.0:*:*:*:*:*:*:*
cpe:2.3:a:couchbase:couchbase_server:4.1.0:*:*:*:*:*:*:*
cpe:2.3:a:couchbase:couchbase_server:4.1.1:*:*:*:*:*:*:*
cpe:2.3:a:couchbase:couchbase_server:4.5.0:*:*:*:*:*:*:*
cpe:2.3:a:couchbase:couchbase_server:4.5.1:*:*:*:*:*:*:*
cpe:2.3:a:couchbase:couchbase_server:5.0.0:*:*:*:*:*:*:*
cpe:2.3:a:couchbase:couchbase_server:5.1.1:*:*:*:*:*:*:*
cpe:2.3:a:couchbase:couchbase_server:5.5.0:*:*:*:*:*:*:*
cpe:2.3:a:couchbase:couchbase_server:5.5.1:*:*:*:*:*:*:*

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