CVE-2008-3263

What it is

The IAX2 protocol implementation in Asterisk Open Source 1.0.x, 1.2.x before 1.2.30, and 1.4.x before 1.4.21.2; Business Edition A.x.x, B.x.x before B.2.5.4, and C.x.x before C.1.10.3; AsteriskNOW; Appliance Developer Kit 0.x.x; and s800i 1.0.x before 1.2.0.1 allows remote attackers to cause a denial of service (call-number exhaustion and CPU consumption) by quickly sending a large number of IAX2 (IAX) POKE requests.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

28.0% chance of exploitation in the next 30 days (EPSS). Higher than most.

Fix

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

Timeline

1. 2008-07-22 23:41 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 22:55 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 28.0% in the next 30 days (EPSS).
• Severity: 7.8 HIGH (CVSS).
• Fix: none linked yet, which raises it.

Details

Published

2008-07-22 23:41 UTC

Last modified

2026-06-16 22:55 UTC

Exploit probability

28.0% · EPSS, next 30 days

Weakness

CWE-399

Record status

Modified

Affected

• Asterisk 0.1.0
• Asterisk 0.1.1
• Asterisk 0.1.2
• Asterisk 0.1.3
• Asterisk 0.1.4
• Asterisk 0.1.5
• Asterisk 0.1.6
• Asterisk 0.1.7

Attack profile CVSS 2.0 · 7.8

Attack vector

Network

Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

Is it in your code?

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