Medium 5.3Published Sep 25, 2016

CVE-2016-4745The 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 a…

Updated under an hour ago (Nov 2, 2026, 1:25 AM ET)

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No exploitation reported and no EPSS estimate yet.

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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.

CVSS: 5.3 MEDIUM (v3.0, NVD)CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness (CWE): CWE-200
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Jun 16, 2026
First seen by InfoSec Signals: Nov 1, 2026

Affected products

Affected products

apple mac_os_x apple:mac_os_x	through 10.11.6	NVD

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.