What’s Vulnerable › Vulnerabilities

CVE-2007-4103

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2007-07-31 · updated 2026-06-16
• Weakness: CWE-772

Description

The IAX2 channel driver (chan_iax2) in Asterisk Open 1.2.x before 1.2.23, 1.4.x before 1.4.9, and Asterisk Appliance Developer Kit before 0.6.0, when configured to allow unauthenticated calls, allows remote attackers to cause a denial of service (resource exhaustion) via a flood of calls that do not complete a 3-way handshake, which causes an ast_channel to be allocated but not released.

Affected products

• Digium Asterisk: from 1.2.20 before 1.2.23; from 1.4.0 before 1.4.9 — fixed in 1.2.23, 1.4.9
• Digium Asterisk Appliance Developer Kit: before 0.6.0 — fixed in 0.6.0

How to fix

Upgrade to a fixed version: Digium Asterisk 1.2.23, 1.4.9; Digium Asterisk Appliance Developer Kit 0.6.0. Check the vendor advisory for mitigations.

References

• http://bugs.gentoo.org/show_bug.cgi?id=185713
• http://ftp.digium.com/pub/asa/ASA-2007-018.pdf
• http://osvdb.org/38197
• http://secunia.com/advisories/26274
• http://secunia.com/advisories/29051
• http://security.gentoo.org/glsa/glsa-200802-11.xml
• http://securityreason.com/securityalert/2960
• http://www.securityfocus.com/archive/1/475069/100/0/threaded
• http://www.securityfocus.com/bid/24950
• http://www.securitytracker.com/id?1018472
• http://www.vupen.com/english/advisories/2007/2701
• http://bugs.gentoo.org/show_bug.cgi?id=185713

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