CVE-2009-1236

What it is

Heap-based buffer overflow in the AppleTalk networking stack in XNU 1228.3.13 and earlier on Apple Mac OS X 10.5.6 and earlier allows remote attackers to cause a denial of service (system crash) via a ZIP NOTIFY (aka ZIPOP_NOTIFY) packet that overwrites a certain ifPort structure member.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.

Exploit odds

8.4% 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. 2009-04-02 00:00 UTC ReservedThe CVE id was reserved by its CNA
2. 2009-04-02 17:30 UTC PublishedDisclosed publicly on CVE.org and NVD
3. 2026-06-16 23:06 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 8.4% in the next 30 days (EPSS).
• Severity: 10.0 HIGH (CVSS).
• Fix: none linked yet, which raises it.

Details

Published

2009-04-02 17:30 UTC

Last modified

2026-06-16 23:06 UTC

Exploit probability

8.4% · EPSS, next 30 days

Weakness

CWE-119 · Buffer errors

Record status

Modified

Affected

• Apple Mac Os X ≤ 10.5.6
• Apple Mac Os X 10.0
• Apple Mac Os X 10.0.0
• Apple Mac Os X 10.0.1
• Apple Mac Os X 10.0.2
• Apple Mac Os X 10.0.3
• Apple Mac Os X 10.0.4
• Apple Mac Os X 10.1

Attack profile CVSS 2.0 · 10.0

Attack vector

Network

Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

Is it in your code?

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