CVE-2021-38155

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

2.48% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 83.4% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-08-06 00:00Z5 YR AGO

Last updated

2024-08-04 01:37Z2 YR AGO

Reserved

2021-08-06

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-307Improper Restriction of Excessive Authentication AttemptsBase

Data version

5.1

Document digest

4a6ab087e258488e697ed8ccb13793ec67690e73c4d4629d27b470572bd27822

• launchpad.nethttps://launchpad.net/bugs/1688137
• security.openstack.orghttps://security.openstack.org/ossa/OSSA-2021-003.html
• www.openwall.com[oss-security] 20210810 [OSSA-2021-003] Keystone: Account name and UUID oracles in account locking (CVE-2021-38155)http://www.openwall.com/lists/oss-security/2021/08/10/5mailing-list
• lists.debian.org[debian-lts-announce] 20240121 [SECURITY] [DLA 3714-1] keystone security updatehttps://lists.debian.org/debian-lts-announce/2024/01/msg00007.htmlmailing-list