CVE-2021-20399

Name: CVE-2021-20399
Creator: NVD / NIST
Published: 2021-07-27T12:15:07.443+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 1.79%

Last modified Jun 17, 2026

CVE-2021-20399 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. IBM Qradar SIEM 7.3.0 to 7.3.3 Patch 8 and 7.4.0 to 7.4.3 GA is vulnerable to an XML External Entity Injection (XXE) attack when processing XML data. A remote attacker could exploit this vulnerability to expose sensitive information or consume memory resources. EPSS estimates a 1.79% chance of exploitation in the next 30 days.

Description

IBM Qradar SIEM 7.3.0 to 7.3.3 Patch 8 and 7.4.0 to 7.4.3 GA is vulnerable to an XML External Entity Injection (XXE) attack when processing XML data. A remote attacker could exploit this vulnerability to expose sensitive information or consume memory resources. IBM X-Force ID: 196073.

Metrics

CVSS 3.1

9.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

EPSS Probability

1.79%

75.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-611

Affected Software

Vendor	Product	Versions
Ibm	Qradar Security Information And Event Manager	>= 7.3.0, < 7.3.3
Ibm	Qradar Security Information And Event Manager	>= 7.4.0, < 7.4.3
Ibm	Qradar Security Information And Event Manager	7.3.3
Ibm	Qradar Security Information And Event Manager	7.4.3

References

https://exchange.xforce.ibmcloud.com/vulnerabilities/196073VDB Entry, Vendor Advisory
https://www.ibm.com/support/pages/node/6475263Patch, Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/196073VDB Entry, Vendor Advisory
https://www.ibm.com/support/pages/node/6475263Patch, Vendor Advisory

Timeline

Published: Jul 27, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20399?

How severe is CVE-2021-20399?

CVE-2021-20399 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 1.79% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20399?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-20399?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST