CVE-2025-0693

Issue with AWS Sign-in IAM User Login Flow - Possible Username Enumeration

State: Published
Severity: 6.9 Medium
Published: Jan 23, 2025
Updated: Oct 14, 2025
Reserved: Jan 23, 2025

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.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	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	AMZN
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N	AMZN

Weaknesses

CWE-204 Observable Response Discrepancy
CWE-208 Observable Timing Discrepancy

Affected Products

Product	Versions
AWS Sign-in IAM Login FlowAWS	N/AAffected

References

https://aws.amazon.com/security/security-bulletins/AWS-2025-002/vendor-advisory

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