How severe is CVE-2018-20170?

CVE-2018-20170 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2018-20170 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-20170?

CVE-2018-20170 affects Openstack Keystone. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-20170?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-20170 published?

CVE-2018-20170 was published on 2018-12-17 and last updated on 2026-06-17.

CVE-2018-20170

CVE-2018-20170 is a medium-severity vulnerability in Openstack Keystone with a CVSS 3.x base score of 5.3. 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-200.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Openstack Keystone
Published: 2018-12-17
Last modified: 2026-06-17

Description

OpenStack Keystone through 14.0.1 has a user enumeration vulnerability because invalid usernames have much faster responses than valid ones for a POST /v3/auth/tokens request. NOTE: the vendor's position is that this is a hardening opportunity, and not necessarily an issue that should have an OpenStack Security Advisory

Frequently asked questions

What is CVE-2018-20170?: OpenStack Keystone through 14.0.1 has a user enumeration vulnerability because invalid usernames have much faster responses than valid ones for a POST /v3/auth/tokens request. NOTE: the vendor's position is that this is a hardening opportunity, and not necessarily an issue that should have an OpenStack Security Advisory
How severe is CVE-2018-20170?: CVE-2018-20170 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2018-20170 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-20170?: CVE-2018-20170 affects Openstack Keystone. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-20170?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-20170 published?: CVE-2018-20170 was published on 2018-12-17 and last updated on 2026-06-17.

References

https://bugs.launchpad.net/keystone/+bug/1795800

Affected products (1)

cpe:2.3:a:openstack:keystone:*:*:*:*:*:*:*:*

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