CVE-2021-20399

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

1.78% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 77.9% of scored records. A rank, not a probability.

NVD base score

9.1 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-07-27 11:25Z5 YR AGO

Last updated

2024-09-17 03:34Z2 YR AGO

Reserved

2020-12-17

Assigning CNA

ibm

Record state

PUBLISHED

Severity

High (CVSS 7.1)

CNA CVSS vector

CVSS:3.0/AV:N/PR:L/C:H/UI:N/AC:L/S:U/I:N/A:L/RC:C/E:U/RL:O

Weaknesses

• CWE-611Improper Restriction of XML External Entity ReferenceBase

Data version

5.1

Document digest

334752abf4eed010a005aba84b5869881d4f5f26df83c854e391ba6a389cfdeb

• www.ibm.comhttps://www.ibm.com/support/pages/node/6475263x_refsource_CONFIRM
• exchange.xforce.ibmcloud.comibm-qradar-cve202120399-xxe (196073)https://exchange.xforce.ibmcloud.com/vulnerabilities/196073vdb-entryx_refsource_XF