CVE-2024-21421Network attack vector

Unauthenticated confidential-data disclosure via undisclosed spoofing

Published Mar 12, 2024 · Updated May 3, 2025

Spoofing in Microsoft Azure SDK 1.0.0 through 1.29.4 allows remote attackers to disclose confidential data via network requests. Microsoft has not published the affected library or dependency, the faulty operation, or how untrusted network input is accepted as authentic. Exploitation requires a network-reachable application using an affected SDK release; no privileges or user interaction are required, and the reported consequence is confidentiality loss only.

CVSS severity7.5
High
EPSS probability1.84%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Spoofing in Microsoft Azure SDK 1.0.0 through 1.29.4 allows remote attackers to disclose confidential data via network requests. Microsoft has not published the affected library or dependency, the faulty operation, or how untrusted network input is accepted as authentic. Exploitation requires a network-reachable application using an affected SDK release; no privileges or user interaction are required, and the reported consequence is confidentiality loss only.

The record

CVE
CVE-2024-21421
Published
Mar 12, 2024
Updated
May 3, 2025
Vendor
Microsoft
Product
Azure SDK
Classifications
CWE-1395
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 12, 2024CVE publishedPublication date reported by the CVE source.
  2. May 3, 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 <1.29.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Azure SDKversion=1.0.0 <1.29.5

Published CVSS scores

7.5Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1395Dependency on Vulnerable Third-Party Component

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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