CVE-2021-3997

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

1.73% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 77.5% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-10-14.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

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

2022-08-23 00:00Z4 YR AGO

Last updated

2026-10-14 09:49Z15 DAYS AGO

Reserved

2021-11-22

Assigning CNA

redhat

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-674Uncontrolled RecursionClass

Data version

5.2

Document digest

9429cdead0cf0bcd61cd0accd3c89097083192539b0a5009556aa10f93973366

• bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=2024639
• www.openwall.comhttps://www.openwall.com/lists/oss-security/2022/01/10/2
• github.comhttps://github.com/systemd/systemd/commit/5b1cf7a9be37e20133c0208005274ce4a5b5c6a1
• access.redhat.comhttps://access.redhat.com/security/cve/CVE-2021-3997
• security.gentoo.orgGLSA-202305-15https://security.gentoo.org/glsa/202305-15vendor-advisory
• cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-398330.html