CVE-2025-33074Network attack vector

Authenticated code execution via improper signature verification

Published Apr 30, 2025 · Updated Aug 10, 2026

Improper cryptographic signature verification in Microsoft Azure Functions allows remote authenticated users to execute code over a network. Microsoft has not published the affected component, signature type, signed input, or exact verification operation that accepts invalid data. Exploitation requires authorized access and high-complexity conditions; successful attacks execute code in the affected hosted-service context.

CVSS severity7.5
High
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper cryptographic signature verification in Microsoft Azure Functions allows remote authenticated users to execute code over a network. Microsoft has not published the affected component, signature type, signed input, or exact verification operation that accepts invalid data. Exploitation requires authorized access and high-complexity conditions; successful attacks execute code in the affected hosted-service context.

The record

CVE
CVE-2025-33074
Published
Apr 30, 2025
Updated
Aug 10, 2026
Vendor
Microsoft
Product
Azure Functions
Classifications
CWE-347, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 2026Record 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=-

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft · Azure Functionsversion=-

Published CVSS scores

7.5Microsoft CorporationCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/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-347Improper Verification of Cryptographic Signature
T1190Exploit Public-Facing Application

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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