CVE-2011-3422

What it is

The Keychain implementation in Apple Mac OS X 10.6.8 and earlier does not properly handle an untrusted attribute of a Certification Authority certificate, which makes it easier for man-in-the-middle attackers to spoof arbitrary SSL servers via an Extended Validation certificate, as demonstrated by https access with Safari.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

0.9% chance of exploitation in the next 30 days (EPSS).

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2011-09-12 12:40 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 23:33 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.9% in the next 30 days (EPSS).
• Severity: 4.3 MEDIUM (CVSS).
• Fix: none linked yet, which raises it.

Details

Published

2011-09-12 12:40 UTC

Last modified

2026-06-16 23:33 UTC

Exploit probability

0.9% · EPSS, next 30 days

Weakness

CWE-20 · Improper input validation

Record status

Modified

Affected

• Apple Mac Os X ≤ 10.6.8
• Apple Mac Os X 10.6.0
• Apple Mac Os X 10.6.1
• Apple Mac Os X 10.6.2
• Apple Mac Os X 10.6.3
• Apple Mac Os X 10.6.4
• Apple Mac Os X 10.6.5
• Apple Mac Os X 10.6.6

Attack profile CVSS 2.0 · 4.3

Attack vector

Network

Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

None

Is it in your code?

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