CVE-2023-36021Network attack vector

Security-feature bypass via invalid certificate acceptance

Published Nov 14, 2023 · Updated Oct 9, 2025

Improper input validation in Microsoft On-premises data gateway before 3000.198.9 allows remote authenticated users to bypass certificate validation. The gateway certificate-validation path accepts attacker-supplied certificates whose signatures are not valid, defeating the intended trust check. Low privileges and user interaction are required; Microsoft has not disclosed which protected operation follows acceptance of the certificate.

CVSS severity8.0
High
EPSS probability1.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Microsoft On-premises data gateway before 3000.198.9 allows remote authenticated users to bypass certificate validation. The gateway certificate-validation path accepts attacker-supplied certificates whose signatures are not valid, defeating the intended trust check. Low privileges and user interaction are required; Microsoft has not disclosed which protected operation follows acceptance of the certificate.

The record

CVE
CVE-2023-36021
Published
Nov 14, 2023
Updated
Oct 9, 2025
Vendor
Microsoft
Product
On-premises data gateway
Classifications
CWE-20
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 9, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0 <3000.198.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft · On-premises data gatewayversion=1.0.0 <3000.198.9

Published CVSS scores

8.0Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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