What is CVE-2021-29702?

CVE-2021-29702 is a high-severity vulnerability in IBM Aix, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 7.5/10. Published 2021-06-16.

How severe is CVE-2021-29702?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in IBM Aix

CVE-2021-29702

Db2 for Linux, UNIX and Windows (includes Db2 Connect Server) 11.1.4 and 11.5.5 is vulnerable to a denial of service as the server terminates abnormally when executing a specially crafted SELECT statement. IBM X-Force ID: 200658.

Published 2021-06-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.019 (78.7th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 78.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000

Affected products

IBM Aix
IBM Db2
IBM Db2 For Linux- Unix And Windows — versions 11.1.4, 11.5.5
Linux Kernel
Microsoft Windows

Weakness classification (CWE)

CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)

References

www.ibm.com/support/pages/node/6463985 (Patch, Vendor Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/200658 (VDB Entry, vdb-entry, Vendor Advisory)
security.netapp.com/advisory/ntap-20210720-0005/ (Third Party Advisory)

Frequently asked questions

What is CVE-2021-29702?: CVE-2021-29702 is a high-severity vulnerability in IBM Aix, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 7.5/10. Published 2021-06-16.
How severe is CVE-2021-29702?: High severity. CVSS v3 base score is 7.5 out of 10.