CVE-2021-40440

lowpriority · track · 14EPSS 0.011 · 64 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.06% (64th) EPSS

CVSS 3.5 · low

Is it mine?

10 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · msrc_csaf

EPSS · scored 2026-10-27

Microsoft Dynamics Business Central Cross-site Scripting Vulnerability

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedMicrosoft Dynamics 365 Business Central 2020 Release Wave 2 – Update 17.10msrc_csaf
17.0.29460:Security Update:https://support.microsoft.com/en-us/help/5006075
https://support.microsoft.com/en-us/help/5006075
FixedMicrosoft Dynamics 365 Business Central 2021 Release Wave 1 - Update 18.5msrc_csaf
18.0.29486:Security Update:https://support.microsoft.com/en-us/help/5006076
https://support.microsoft.com/en-us/help/5006076

cvss

Technical severity, 0–10. One row per scoring source.

5.4

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 3–5.4

v2.03.5lowAV:N/AC:M/Au:S/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 6.8 · impact 2.9

v2.03lowAV:N/AC:M/Au:S/C:N/I:P/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.15.4mediumAV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:Nsecondary · FSTEC (BDU) RU

v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:Nsecondary · secure@microsoft.com USexploitability 2.3 · impact 2.7

v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:P/RL:O/RC:Csecondary · Microsoft Security Response Center US

v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:P/RL:O/RC:Csecondary · ENISA EU

v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:Nsecondary · NVD / NIST USexploitability 2.3 · impact 2.7

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-79USprimaryCWE-79US

affected products (10)

Products and version ranges known to be affected.

Microsoft Microsoft Dynamics 365 Business Central 2020 Release Wave 2 – Update 17.1017.0.0.0 → 17.0.29460enisa_euvdEU
Microsoft Microsoft Dynamics 365 Business Central 2021 Release Wave 1 - Update 18.518.0.0.0 → 18.0.29486enisa_euvdEU
Microsoft Corp Microsoft Dynamics 365 Business Central≤ 2020 Release Wave 2 – Update 17.10fstec_bduRU
Microsoft Corp Microsoft Dynamics 365 Business Central≤ 2021 Release Wave 1 - Update 18.5fstec_bduRU
Microsoft Dynamics 365 Business Central 2020 Release Wave 2 – Update 17.10all versionsfixedmsrc_csafUS
Microsoft Dynamics 365 Business Central 2020 Release Wave 2 – Update 17.10< 17.0.29460msrc_csafUS
Microsoft Dynamics 365 Business Central 2021 Release Wave 1 - Update 18.5all versionsfixedmsrc_csafUS
Microsoft Dynamics 365 Business Central 2021 Release Wave 1 - Update 18.5< 18.0.29486msrc_csafUS
microsoft dynamics 365 business central= 2020nvdUScpe:2.3:a:microsoft:dynamics_365_business_central:*:*:*:*:*:*:*:*
microsoft dynamics 365 business central= 2021nvdUScpe:2.3:a:microsoft:dynamics_365_business_central:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

msrc_CVE-2021-40440Microsoft Dynamics Business Central Cross-site Scripting Vulnerability2021-09-14csaf · msrc_csafUS
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu msrc_csaf nvd NVD CVE.org MITRE

published 2021-09-15modified 2026-08-10

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+53015 more

references (6)

External citations — patches, advisories, analysis.

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