Variable response times in the AWS Sign-in IAM user login flow allowed for the use of brute force enumeration techniques to identify valid IAM usernames in an arbitrary AWS account.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00094.

Exploitation none

Automatable yes

Technical Impact partial

Affected Vendors & Products

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Advisories
Source ID Title
EUVD EUVD EUVD-2025-1817 Variable response times in the AWS Sign-in IAM user login flow allowed for the use of brute force enumeration techniques to identify valid IAM usernames in an arbitrary AWS account.
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://aws.amazon.com/security/security-bulletins/AWS-2025-002/ cve-icon cve-icon
History

Tue, 14 Oct 2025 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 23 Jan 2025 21:30:00 +0000

Type Values Removed Values Added
Description Variable response times in the AWS Sign-in IAM user login flow allowed for the use of brute force enumeration techniques to identify valid IAM usernames in an arbitrary AWS account.
Title Issue with AWS Sign-in IAM User Login Flow - Possible Username Enumeration
Weaknesses CWE-204
CWE-208
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N'}
cve-icon MITRE

Status: PUBLISHED

Assigner: AMZN

Published:

Updated: 2025-10-14T18:42:46.835Z

Reserved: 2025-01-23T20:36:22.905Z

Link: CVE-2025-0693

cve-icon Vulnrichment

Updated: 2025-01-24T19:33:48.497Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-01-23T22:15:15.397

Modified: 2025-10-14T19:15:37.637

Link: CVE-2025-0693

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.