CVE-2007-4103

Name: CVE-2007-4103
Creator: NVD / NIST
Published: 2007-07-31T10:17:00+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 5.94%

Last modified Jun 16, 2026

CVE-2007-4103 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 5.94% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

5.94%

92.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-772

Affected Software

Vendor	Product	Versions
Digium	Asterisk	>= 1.2.20, < 1.2.23
Digium	Asterisk	>= 1.4.0, < 1.4.9
Digium	Asterisk Appliance Developer Kit	< 0.6.0

References

http://bugs.gentoo.org/show_bug.cgi?id=185713Issue Tracking, Patch
http://ftp.digium.com/pub/asa/ASA-2007-018.pdfBroken Link, Patch
http://osvdb.org/38197Broken Link
http://secunia.com/advisories/26274Broken Link, Patch, Vendor Advisory
http://secunia.com/advisories/29051Broken Link
http://security.gentoo.org/glsa/glsa-200802-11.xmlThird Party Advisory
http://securityreason.com/securityalert/2960Broken Link
http://www.securityfocus.com/archive/1/475069/100/0/threadedBroken Link, Third Party Advisory, VDB Entry
http://www.securityfocus.com/bid/24950Broken Link, Third Party Advisory, VDB Entry
http://www.securitytracker.com/id?1018472Broken Link, Third Party Advisory, VDB Entry
http://www.vupen.com/english/advisories/2007/2701Broken Link
http://bugs.gentoo.org/show_bug.cgi?id=185713Issue Tracking, Patch
http://ftp.digium.com/pub/asa/ASA-2007-018.pdfBroken Link, Patch
http://osvdb.org/38197Broken Link
http://secunia.com/advisories/26274Broken Link, Patch, Vendor Advisory
http://secunia.com/advisories/29051Broken Link
http://security.gentoo.org/glsa/glsa-200802-11.xmlThird Party Advisory
http://securityreason.com/securityalert/2960Broken Link
http://www.securityfocus.com/archive/1/475069/100/0/threadedBroken Link, Third Party Advisory, VDB Entry
http://www.securityfocus.com/bid/24950Broken Link, Third Party Advisory, VDB Entry
http://www.securitytracker.com/id?1018472Broken Link, Third Party Advisory, VDB Entry
http://www.vupen.com/english/advisories/2007/2701Broken Link

Timeline

Published: Jul 31, 2007
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2007-4103?

How severe is CVE-2007-4103?

CVE-2007-4103 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 5.94% probability of exploitation in the next 30 days.

How do I fix CVE-2007-4103?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2007-4103?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST