CVE-2007-3763

Asterisk vulnerability

CVSS

5.0

EPSS

26.6%

EPSS pct

98th

Exploited

No known

The IAX2 channel driver (chan_iax2) in Asterisk before 1.2.22 and 1.4.x before 1.4.8, Business Edition before B.2.2.1, AsteriskNOW before beta7, Appliance Developer Kit before 0.5.0, and s800i before 1.0.2 allows remote attackers to cause a denial of service (crash) via a crafted (1) LAGRQ or (2) LAGRP frame that contains information elements of IAX frames, which results in a NULL pointer dereference when Asterisk does not properly set an associated variable.

Affected vendor

Asterisk

Affected product

Asterisk

CVSS vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

Published

2007-07-18

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no authentication. Successful exploitation leads to partial impact to availability.

Its EPSS score of 26.6% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 98% of all scored CVEs.

Check your external exposure to CVE-2007-3763

Confirm whether Asterisk Asterisk is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2007-3763.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2007-3763

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2007-3763 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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