CVE-2023-21531

Credential disclosure via unverified WAagent request origins

Published Jan 10, 2023 · Updated Jan 1, 2025

Improper access control in Microsoft Azure Service Fabric allows local users in a privileged container to disclose stored credentials. The WAagent daemon insufficiently verifies request origins, allowing high-privilege container code to obtain credentials stored on the host. Affected releases are 8.2 before 8.2 CU8, Linux 9.0 before 9.0 CU5, and 9.1 before 9.1 CU1; exposure enables further cluster compromise.

CVSS severity7.0
High
EPSS probability0.61%
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 Service Fabric allows local users in a privileged container to disclose stored credentials. The WAagent daemon insufficiently verifies request origins, allowing high-privilege container code to obtain credentials stored on the host. Affected releases are 8.2 before 8.2 CU8, Linux 9.0 before 9.0 CU5, and 9.1 before 9.1 CU1; exposure enables further cluster compromise.

The record

CVE
CVE-2023-21531
Published
Jan 10, 2023
Updated
Jan 1, 2025
Vendor
Microsoft
Product
Azure Service Fabric
Classifications
CWE-284, T1611
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 10, 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=8.2 <8.2 CU8
  2. Affected versionversion=9.1 <9.1 CU1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Microsoft · Azure Service Fabricversion=8.2 <8.2 CU8; version=9.1 <9.1 CU1
Microsoft · Azure Service Fabric for Linuxversion=9.0 <9.0 CU5

Published CVSS scores

7.0MicrosoftCVSS:3.1/AV:L/AC:H/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1611Escape to Host

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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