What is CVE-2021-29687?

CVE-2021-29687 is a medium-severity vulnerability in IBM Aix, classified under Observable Discrepancy. CVSS score: 5.3/10. Published 2021-05-20.

How severe is CVE-2021-29687?

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

Vulnerability in IBM Aix

CVE-2021-29687

IBM Security Identity Manager 7.0.2 could allow a remote user to enumerate usernames due to a difference of responses from valid and invalid login attempts. IBM X-Force ID: 200018

Published 2021-05-20 · 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: 0.013 (68.5th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 68.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

IBM Aix
IBM Security Identity Manager — versions 6.0.2
IBM Security Identity Manager — versions 6.0.2
Linux Kernel
Microsoft Windows
Oracle Solaris

Weakness classification (CWE)

CWE-203 — Observable Discrepancy

References

www.ibm.com/support/pages/node/6454605 (Vendor Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/200018 (VDB Entry, vdb-entry, Vendor Advisory)

Frequently asked questions

What is CVE-2021-29687?: CVE-2021-29687 is a medium-severity vulnerability in IBM Aix, classified under Observable Discrepancy. CVSS score: 5.3/10. Published 2021-05-20.
How severe is CVE-2021-29687?: Medium severity. CVSS v3 base score is 5.3 out of 10.