CVE-2010-1378

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2010-11-15 · updated 2026-06-16
Weakness: CWE-295

Description

OpenSSL in Apple Mac OS X 10.6.x before 10.6.5 does not properly perform arithmetic, which allows remote attackers to bypass X.509 certificate authentication via an arbitrary certificate issued by a legitimate Certification Authority.

Affected products

macOS: from 10.6.0 before 10.6.5 — fixed in 10.6.5
Apple Mac Os X Server: from 10.6.0 before 10.6.5 — fixed in 10.6.5

How to fix

Upgrade to a fixed version: macOS 10.6.5; Apple Mac Os X Server 10.6.5. Check the vendor advisory for mitigations.

References

http://lists.apple.com/archives/security-announce/2010//Nov/msg00000.html
http://support.apple.com/kb/HT4435
http://lists.apple.com/archives/security-announce/2010//Nov/msg00000.html
http://support.apple.com/kb/HT4435

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