What is CVE-2021-29772?

CVE-2021-29772 is a critical-severity vulnerability in IBM API Connect, classified under Code Injection. CVSS score: 9.8/10. Published 2021-08-26.

How severe is CVE-2021-29772?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in IBM API Connect

CVE-2021-29772

IBM API Connect 5.0.0.0 through 5.0.8.11 could allow a user to potentially inject code due to unsanitized user input. IBM X-Force ID: 202774.

Vulnerability class: RCE (Remote Code Execution)

Published 2021-08-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (58.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 58.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

IBM API Connect — versions 5.0.0.0, 5.0.8.11
IBM API Connect

Weakness classification (CWE)

CWE-94 — Code Injection

References

www.ibm.com/support/pages/node/6483655 (Patch, Vendor Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/202774 (VDB Entry, vdb-entry, Vendor Advisory)

Frequently asked questions

What is CVE-2021-29772?: CVE-2021-29772 is a critical-severity vulnerability in IBM API Connect, classified under Code Injection. CVSS score: 9.8/10. Published 2021-08-26.
How severe is CVE-2021-29772?: Critical severity. CVSS v3 base score is 9.8 out of 10.