CVE-2025-0693 Issue with AWS Sign-in IAM User Login Flow - Possible Username Enumeration
Attackers can enumerate valid IAM usernames in AWS accounts by analyzing variable response times during the login flow.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-0693?
CVE-2025-0693 is a medium-severity vulnerability in AWS Sign-in IAM Login Flow, published on 23 Jan 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2025-0693?
How do I fix CVE-2025-0693?
No fix has been published for CVE-2025-0693 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-0693 being exploited?
There is no known exploitation of CVE-2025-0693 in the wild and no public exploit code.
Sources
Also known as GHSA-8rcr-h4v8-qpq5.