{"id":"CVE-2025-0693","aliases":["EUVD-2025-1817","GHSA-8rcr-h4v8-qpq5"],"status":"published","title":"Issue with AWS Sign-in IAM User Login Flow - Possible Username Enumeration","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.","severity":{"version":"4.0","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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.0036,"percentile":0.30115,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-204","CWE-208"],"published":"2025-01-23T21:22:25Z","modified":"2026-06-17T08:26:59Z","products":[{"vendor":"aws","product":"aws sign-in iam login flow"}],"references":[{"url":"https://aws.amazon.com/security/security-bulletins/AWS-2025-002/","tags":["vendor-advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-0693"},{"url":"https://aws.amazon.com/security/security-bulletins/AWS-2025-002"},{"url":"https://github.com/advisories/GHSA-8rcr-h4v8-qpq5"}],"sources":{"cve":[{"id":"CVE-2025-0693","title":"Issue with AWS Sign-in IAM User Login Flow - Possible Username Enumeration","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.","status":"published","published":"2025-01-23T21:22:25.699Z","modified":"2025-10-14T18:42:46.835Z","cvss":[{"version":"4.0","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","level":"medium","assessor":"cna"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-204","CWE-208"],"updated_at":"2026-11-02T14:32:53.81273Z"}],"euvd":[{"id":"EUVD-2025-1817","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.","status":"published","published":"2025-01-23T21:22:25Z","modified":"2025-10-14T18:42:46Z","cvss":[{"version":"4.0","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","level":"medium"}],"updated_at":"2026-11-02T20:31:33.01309Z"}],"ghsa":[{"id":"GHSA-8rcr-h4v8-qpq5","title":"Variable response times in the AWS Sign-in IAM user login flow allowed for the use of brute force...","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.","status":"published","published":"2025-01-24T00:31:47Z","modified":"2025-01-24T00:31:57Z","cvss":[{"version":"4.0","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-204"],"updated_at":"2026-11-02T14:59:39.698534Z"}],"nvd":[{"id":"CVE-2025-0693","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.","status":"published","published":"2025-01-23T22:15:15.397Z","modified":"2026-06-17T08:26:59.03Z","cvss":[{"version":"4.0","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-204","CWE-208"],"updated_at":"2026-11-02T14:10:49.483601Z"}]}}