CVE-2021-40440

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

1.06% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 64.5% 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 2026-08-10.

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

2021-09-15 11:24Z5 YR AGO

Last updated

2026-08-10 15:11Z2 MO AGO

Reserved

2021-09-02

Assigning CNA

microsoft

Record state

PUBLISHED

Severity

Medium (CVSS 5.4)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:P/RL:O/RC:C

Weaknesses

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

Data version

5.2

Document digest

c92ba5235c87c540ba58d28a34c0578c76d614e03953ef85732e0d38e366902d

• msrc.microsoft.comMicrosoft Dynamics Business Central Cross-site Scripting Vulnerabilityhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-40440vendor-advisorypatch
• portal.msrc.microsoft.comhttps://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40440x_refsource_MISC