No exploitation reportedFix available

CVE-2007-4103

Q: Is CVE-2007-4103 actively exploited?

Active exploitation of CVE-2007-4103 has not been confirmed. Its EPSS score was 5.9% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2007-4103?

CVE-2007-4103 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2007-07-31
Fixed in1.4.9 · 1.2.23
WeaknessCWE-772

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2007-07-3110:17CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2007-4103?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2007-4103?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Digium asterisk

Branch	Affected	Fixed in	Source
1.4	≥ 1.4.0, < 1.4.9	1.4.9	NVD
1.2	≥ 1.2.20, < 1.2.23	1.2.23	NVD

Digium asterisk appliance developer kit

Branch	Affected	Fixed in	Source
0.6	< 0.6.0	0.6.0	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Digium asterisk to 1.4.9 · 1.2.23

Advisories and patches

bugs.gentoo.orgPatch
ftp.digium.comPatch
secunia.comPatch · Vendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.17.5read 2026-10-23
NVDCVSS 2.07.8read 2026-10-23
NVDweakness (CWE)CWE-772read 2026-10-23
FIRST EPSSEPSS score5.9 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2007-07-31
Last Modified: 2026-06-16
NVD status: Modified

Frequently asked questions

What is CVE-2007-4103?

Is CVE-2007-4103 actively exploited?

Active exploitation of CVE-2007-4103 has not been confirmed. Its EPSS score was 5.9% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2007-4103?

CVE-2007-4103 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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