What is CVE-2021-20581?

CVE-2021-20581 is a medium-severity vulnerability in Apple macOS, classified under Insufficient Session Expiration. CVSS score: 5.3/10. Published 2023-10-17.

How severe is CVE-2021-20581?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Apple macOS

CVE-2021-20581

IBM Security Verify Privilege On-Premises 11.5 could allow a user to obtain sensitive information due to insufficient session expiration. IBM X-Force ID: 199324.

Published 2023-10-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.004 (29.9th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 29.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Apple macOS
IBM Security Verify Privilege — versions 11.5
IBM Security Verify Privilege On-Premises
Microsoft Windows

Weakness classification (CWE)

CWE-613 — Insufficient Session Expiration

References

www.ibm.com/support/pages/node/7047202 (vendor-advisory, Patch, Vendor Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/199324 (VDB Entry, Vendor Advisory)

Frequently asked questions

What is CVE-2021-20581?: CVE-2021-20581 is a medium-severity vulnerability in Apple macOS, classified under Insufficient Session Expiration. CVSS score: 5.3/10. Published 2023-10-17.
How severe is CVE-2021-20581?: Medium severity. CVSS v3 base score is 5.3 out of 10.