CVE-2007-3763

CVE-2007-3763 is a medium-severity vulnerability in Asterisk with a CVSS 2.0 base score of 5.0. Its EPSS exploit-prediction score of 27% places it in the 98th percentile, indicating an elevated likelihood of exploitation.

Key facts

• Severity: Medium (CVSS 2.0 base score 5.0)
• EPSS exploit prediction: 27% (98th percentile)
• Actively exploited: Not listed in CISA KEV
• Affected product: Asterisk
• Published: 2007-07-18
• Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is CVE-2007-3763?

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.

How severe is CVE-2007-3763?

CVE-2007-3763 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2007-3763 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 27% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2007-3763?

CVE-2007-3763 primarily affects Asterisk. In total, 36 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2007-3763?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2007-3763 published?

CVE-2007-3763 was published on 2007-07-18 and last updated on 2026-06-16.

References

• http://bugs.gentoo.org/show_bug.cgi?id=185713
• http://ftp.digium.com/pub/asa/ASA-2007-015.pdf
• http://secunia.com/advisories/26099
• http://secunia.com/advisories/29051
• http://security.gentoo.org/glsa/glsa-200802-11.xml
• http://www.debian.org/security/2007/dsa-1358
• http://www.novell.com/linux/security/advisories/2007_15_sr.html
• http://www.securityfocus.com/bid/24950
• http://www.securitytracker.com/id?1018407
• http://www.vupen.com/english/advisories/2007/2563

Affected products (36)

• cpe:2.3:a:asterisk:asterisk:1.0:*:*:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:1.0.6:*:*:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:1.0.7:*:*:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:1.0.8:*:*:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:1.0.9:*:*:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:1.0.10:*:*:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:1.0.11:*:*:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:1.0.12:*:*:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:1.2.0_beta1:*:*:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:1.2.0_beta2:*:*:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:1.2.5:*:*:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:1.2.6:*:*:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:1.2.7:*:*:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:1.2.8:*:*:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:1.2.9:*:*:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:1.2.10:*:*:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:1.2.11:*:*:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:1.2.12:*:*:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:1.2.13:*:*:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:1.2.14:*:*:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:1.2.15:*:*:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:1.2.16:*:*:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:1.2.17:*:*:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:1.4.1:*:*:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:1.4.2:*:*:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:1.4.4_2007-04-27:*:*:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:1.4_beta:*:*:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:a:*:business:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:b.1.3.2:*:business:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:b.1.3.3:*:business:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk:b.2.2.0:*:business:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisk_appliance_developer_kit:*:*:*:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisknow:beta_5:*:*:*:*:*:*:*
• cpe:2.3:a:asterisk:asterisknow:beta_6:*:*:*:*:*:*:*
• cpe:2.3:h:asterisk:s800i_appliance:1.0:*:*:*:*:*:*:*
• cpe:2.3:h:asterisk:s800i_appliance:1.0.1:*:*:*:*:*:*:*

More vulnerabilities in Asterisk

• CVE-2007-2488 — Critical (CVSS 10.0): The IAX2 channel driver (chan_iax2) in Asterisk before 20070504 does not properly null terminate data, which allows…
• CVE-2008-1390 — Critical (CVSS 9.3): The AsteriskGUI HTTP server in Asterisk Open Source 1.4.x before 1.4.19-rc3 and 1.6.x before 1.6.0-beta6, Business…
• CVE-2007-3762 — Critical (CVSS 9.3): Stack-based buffer overflow in the IAX2 channel driver (chan_iax2) in Asterisk before 1.2.22 and 1.4.x before 1.4.8,…
• CVE-2008-1332 — High (CVSS 8.8): Unspecified vulnerability in Asterisk Open Source 1.2.x before 1.2.27, 1.4.x before 1.4.18.1 and 1.4.19-rc3; Business…
• CVE-2009-2346 — High (CVSS 7.8): The IAX2 protocol implementation in Asterisk Open Source 1.2.x before 1.2.35, 1.4.x before 1.4.26.2, 1.6.0.x before…
• CVE-2008-3263 — High (CVSS 7.8): The IAX2 protocol implementation in Asterisk Open Source 1.0.x, 1.2.x before 1.2.30, and 1.4.x before 1.4.21.2;…

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