CVE-2020-13821

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

0.53% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 42.9% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

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

2020-08-26 15:23Z6 YR AGO

Last updated

2024-08-04 12:25Z2 YR AGO

Reserved

2020-06-04

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')Base

Data version

5.1

Document digest

607ba1ea6f68209f240ecfb509d286f575ac820a6e1d953ce3d8a9e184d6cb06

• payatu.comhttps://payatu.com/advisory/hivemq-mqtt-broker---xss-over-mqttx_refsource_MISC
• www.hivemq.comhttps://www.hivemq.com/blog/hivemq-4-3-3-released/x_refsource_CONFIRM