What is CVE-2021-29781?

CVE-2021-29781 is a critical-severity vulnerability in IBM Partner Engagement Manager, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2021-07-30.

How severe is CVE-2021-29781?

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

Deserialization in IBM Partner Engagement Manager

CVE-2021-29781

IBM Partner Engagement Manager 2.0 could allow a remote attacker to execute arbitrary code on the system, caused by an unsafe deserialization flaw. By sending specially-crafted data, an attacker could exploit this vulnerability to execute arbitrary code on the system. IBM X-Force ID: 203091.

Vulnerability class: Insecure Deserialization

Published 2021-07-30 · 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: 0.029 (86.7th percentile), scored 2026-10-24.

Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 86.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.029 · newest: 0.029 · change: 0.000

Affected products

IBM Partner Engagement Manager — versions 2.0
IBM Partner Engagement Manager — versions 2.0
Linux Kernel

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

www.ibm.com/support/pages/node/6476668 (Patch, Vendor Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/203091 (VDB Entry, vdb-entry, Vendor Advisory)

Frequently asked questions

What is CVE-2021-29781?: CVE-2021-29781 is a critical-severity vulnerability in IBM Partner Engagement Manager, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2021-07-30.
How severe is CVE-2021-29781?: Critical severity. CVSS v3 base score is 9.8 out of 10.