# CVE-2025-0693: Issue with AWS Sign-in IAM User Login Flow - Possible Username Enumeration

> CVE-2025-0693: Issue with AWS Sign-in IAM User Login Flow - Possible Username Enumeration. CVSS 5.3 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2025-0693
Last updated: 2026-06-17T08:26:59Z

- Published: 2025-01-23 21:22 UTC · Updated: 2026-06-17 08:26 UTC · Assigner: AMZN
- CVSS: 5.3 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- EPSS: 0.37%, 30th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-204, CWE-208

## 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.

## Affected vendors and products

- AWS: AWS Sign-in IAM Login Flow

## Tracked companies

- [Amazon Web Services](https://rewindex.com/company/aws.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2025-0693)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-0693)
- [https://aws.amazon.com/security/security-bulletins/AWS-2025-002/](https://aws.amazon.com/security/security-bulletins/AWS-2025-002/)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2025-0693 · Markdown: https://rewindex.com/cve/CVE-2025-0693.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-0693 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T04:03:26.850Z