What is CVE-2021-29693?

CVE-2021-29693 is a medium-severity vulnerability in IBM Aix. CVSS score: 4.4/10. Published 2021-06-28.

How severe is CVE-2021-29693?

Medium severity. CVSS v3 base score is 4.4 out of 10.

Vulnerability in IBM Aix

CVE-2021-29693

IBM AIX 7.1, 7.2, and VIOS 3.1 could allow a local user that is in the with elevated group privileges to cause a denial of service due to a vulnerability in the lpd daemon. IBM X-Force ID: 200255.

Published 2021-06-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.006 (49.3th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

IBM Aix — versions 7.1, 7.2
IBM Vios — versions 3.1

References

www.ibm.com/support/pages/node/6467129 (Patch, Vendor Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/200255 (VDB Entry, vdb-entry, Vendor Advisory)

Frequently asked questions

What is CVE-2021-29693?: CVE-2021-29693 is a medium-severity vulnerability in IBM Aix. CVSS score: 4.4/10. Published 2021-06-28.
How severe is CVE-2021-29693?: Medium severity. CVSS v3 base score is 4.4 out of 10.