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Vulnerability record · CVE-2007-4103 · published 31 July 2007

CVE-2007-4103: Digium asterisk vulnerability

Digium · Asterisk

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.

7.5 CVSS 3.1 High EPSS 5.9% · top 7.0% CWE-772 · CWE-772
7.5CVSS 3.1 base score, v2 7.8
5.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
22References
16 Jun 2026Last modified by NVD

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.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://bugs.gentoo.org/show_bug.cgi?id=185713 Issue TrackingPatch
http://ftp.digium.com/pub/asa/ASA-2007-018.pdf Broken LinkPatch
http://osvdb.org/38197 Broken Link
http://secunia.com/advisories/26274 Broken LinkPatchVendor Advisory
http://secunia.com/advisories/29051 Broken Link
http://security.gentoo.org/glsa/glsa-200802-11.xml Third Party Advisory
http://securityreason.com/securityalert/2960 Broken Link
http://www.securityfocus.com/archive/1/475069/100/0/threaded Broken LinkThird Party AdvisoryVDB Entry
http://www.securityfocus.com/bid/24950 Broken LinkThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id?1018472 Broken LinkThird Party AdvisoryVDB Entry
http://www.vupen.com/english/advisories/2007/2701 Broken Link
http://bugs.gentoo.org/show_bug.cgi?id=185713 Issue TrackingPatch
http://ftp.digium.com/pub/asa/ASA-2007-018.pdf Broken LinkPatch
http://osvdb.org/38197 Broken Link
http://secunia.com/advisories/26274 Broken LinkPatchVendor Advisory
http://secunia.com/advisories/29051 Broken Link
http://security.gentoo.org/glsa/glsa-200802-11.xml Third Party Advisory
http://securityreason.com/securityalert/2960 Broken Link
http://www.securityfocus.com/archive/1/475069/100/0/threaded Broken LinkThird Party AdvisoryVDB Entry
http://www.securityfocus.com/bid/24950 Broken LinkThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id?1018472 Broken LinkThird Party AdvisoryVDB Entry
http://www.vupen.com/english/advisories/2007/2701 Broken Link

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2007-4103), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.