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

Quick assessment

Affected
AWS AWS Sign-in IAM Login Flow
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Amazon AWS Identity and Access Management（Amazon AWS IAM）是美国亚马逊（Amazon）公司的一种 Web 服务，用于安全控制对 AWS 服务的访问。 Amazon AWS Identity and Access Management存在安全漏洞，该漏洞源于用户登录流程中的可变响应时间,允许使用暴力枚举技术来识别任意 AWS 账户中的有效 IAM 用户名。

CVSS 5.3 · Medium EPSS 0.37% · P30
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I. Basic Information for CVE-2025-0693

Vulnerability Information
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Vulnerability Title
Issue with AWS Sign-in IAM User Login Flow - Possible Username Enumeration
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
响应差异性信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Amazon AWS Identity and Access Management 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Amazon AWS Identity and Access Management（Amazon AWS IAM）是美国亚马逊（Amazon）公司的一种 Web 服务，用于安全控制对 AWS 服务的访问。 Amazon AWS Identity and Access Management存在安全漏洞，该漏洞源于用户登录流程中的可变响应时间,允许使用暴力枚举技术来识别任意 AWS 账户中的有效 IAM 用户名。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
AWS AWS Sign-in IAM Login Flow N/A -

II. Public POCs for CVE-2025-0693

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III. Intelligence Information for CVE-2025-0693

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Vendor Advisories for CVE-2025-0693 (1)

IV. Related Vulnerabilities

Same vendor: AWS
Same weakness: CWE-204

V. Comments for CVE-2025-0693

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