CVE-2016-4745

Severity: medium (CVSS 5.3 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2016-09-25 · updated 2026-06-17
Weakness: CWE-200

Description

The Kerberos 5 (aka krb5) PAM module in Apple OS X before 10.12 does not use constant-time operations for determining username validity, which makes it easier for remote attackers to enumerate user accounts via a timing side-channel attack.

Affected products

macOS: through 10.11.6

References

http://lists.apple.com/archives/security-announce/2016/Sep/msg00006.html
http://www.securityfocus.com/bid/93055
http://www.securitytracker.com/id/1036858
https://support.apple.com/HT207170
http://lists.apple.com/archives/security-announce/2016/Sep/msg00006.html
http://www.securityfocus.com/bid/93055
http://www.securitytracker.com/id/1036858
https://support.apple.com/HT207170

Get alerted when CVE-2016-4745 or the next vulnerability affects your stack