CVE-2021-20815

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

0.90% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 59.2% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI: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

2021-08-26 01:20Z5 YR AGO

Last updated

2024-08-03 17:53Z2 YR AGO

Reserved

2020-12-17

Assigning CNA

jpcert

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

c88f251c3da6eb089cc341320e23c5685419e3e33cf00489ba28e07e27cb068f

• movabletype.orghttps://movabletype.org/news/2021/08/mt-780-681-released.htmlx_refsource_MISC
• jvn.jphttps://jvn.jp/en/jp/JVN97545738/index.htmlx_refsource_MISC