CVE-2023-21751Network attack vector

Authenticated content spoofing

Published Dec 13, 2023 · Updated Jan 1, 2025

Improper access control in Microsoft Azure DevOps Server allows remote authenticated users to spoof trusted content over the network. Microsoft has not published the affected request handler or the access-control operation that mishandles attacker-supplied input. Low-privileged credentials are required, and successful exploitation alters integrity without disclosing data or interrupting service.

CVSS severity6.5
Medium
EPSS probability0.98%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Microsoft Azure DevOps Server allows remote authenticated users to spoof trusted content over the network. Microsoft has not published the affected request handler or the access-control operation that mishandles attacker-supplied input. Low-privileged credentials are required, and successful exploitation alters integrity without disclosing data or interrupting service.

The record

CVE
CVE-2023-21751
Published
Dec 13, 2023
Updated
Jan 1, 2025
Vendor
Microsoft
Product
Azure DevOps Server
Classifications
CWE-284
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 13, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 1, 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=2020.1.0 <20231127.4
  2. Affected versionversion=20231128.1 <20231128.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft · Azure DevOps Serverversion=2020.1.0 <20231127.4; version=20231128.1 <20231128.1

Published CVSS scores

6.5Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

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-284Improper Access Control

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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