What is CVE-2021-20557?

CVE-2021-20557 is a high-severity vulnerability in IBM Security Guardium, classified under OS Command Injection. CVSS score: 7.2/10. Published 2021-05-24.

How severe is CVE-2021-20557?

High severity. CVSS v3 base score is 7.2 out of 10.

RCE in IBM Security Guardium

CVE-2021-20557

IBM Security Guardium 11.2 could allow a remote authenticated attacker to execute arbitrary commands on the system by sending a specially crafted request. IBM X-Force ID: 199184.

Vulnerability class: Command Injection (OS Command Injection)

Published 2021-05-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.027 (85.6th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 85.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.027 · newest: 0.027 · change: 0.000

Affected products

IBM Security Guardium — versions 11.2
IBM Security Guardium — versions 11.2
Linux Kernel

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

www.ibm.com/support/pages/node/6455269 (Patch, Vendor Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/199184 (VDB Entry, vdb-entry, Vendor Advisory)

Frequently asked questions

What is CVE-2021-20557?: CVE-2021-20557 is a high-severity vulnerability in IBM Security Guardium, classified under OS Command Injection. CVSS score: 7.2/10. Published 2021-05-24.
How severe is CVE-2021-20557?: High severity. CVSS v3 base score is 7.2 out of 10.