CVE-2022-30187

Blob plaintext disclosure via CBC padding oracle

Published Jul 12, 2022 · Updated Jul 8, 2025

Padding oracle in Microsoft Azure Storage SDK client-side encryption v1 allows attackers to recover blob plaintext through decryption errors. The v1 implementation decrypts CBC ciphertext with PKCS#5 padding and reveals whether padding validation failed, creating an oracle. Exploitation requires blob write access and repeated observation of an endpoint's decryption failures, yielding plaintext without reported integrity or availability impact.

CVSS severity4.7
Medium
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Padding oracle in Microsoft Azure Storage SDK client-side encryption v1 allows attackers to recover blob plaintext through decryption errors. The v1 implementation decrypts CBC ciphertext with PKCS#5 padding and reveals whether padding validation failed, creating an oracle. Exploitation requires blob write access and repeated observation of an endpoint's decryption failures, yielding plaintext without reported integrity or availability impact.

The record

CVE
CVE-2022-30187
Published
Jul 12, 2022
Updated
Jul 8, 2025
Vendor
Microsoft
Product
Azure Storage Queues client library for .NET
Classifications
CWE-327
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 12, 2022CVE publishedPublication date reported by the CVE source.
  2. Jul 8, 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=12.0.0 <12.13.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Microsoft · Azure Storage Queues client library for .NETversion=12.0.0 <12.13.0
Microsoft · Azure Storage Queues client library for Pythonversion=12.0.0 <12.4.0
Microsoft · Azure Storage Blobs client library for .NETversion=12.0.0 <12.13.0
Microsoft · Azure Storage Blobs client library for Javaversion=12.0.0 <12.18.0
Microsoft · Azure Storage Blobs client library for Pythonversion=12.0.0 <12.13.0

Published CVSS scores

4.7Microsoft CorporationCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
1.9INCIBE-CERTAV:L/AC:M/Au:N/C:P/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-327Use of a Broken or Risky Cryptographic Algorithm

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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