How severe is CVE-2008-1923?

CVE-2008-1923 has a CVSS 2.0 base score of 7.1, rated high severity.

Is CVE-2008-1923 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2008-1923?

CVE-2008-1923 primarily affects Asterisk Asterisk Appliance Developer Kit. In total, 136 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2008-1923?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2008-1923 published?

CVE-2008-1923 was published on 2008-04-23 and last updated on 2026-06-16.

CVE-2008-1923

CVE-2008-1923 is a high-severity vulnerability in Asterisk Asterisk Appliance Developer Kit with a CVSS 2.0 base score of 7.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-16.

Key facts

Severity: High (CVSS 2.0 base score 7.1)
EPSS exploit prediction: 1% (69th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-16
Affected product: Asterisk Asterisk Appliance Developer Kit
Published: 2008-04-23
Last modified: 2026-06-16

Description

The IAX2 channel driver (chan_iax2) in Asterisk 1.2 before revision 72630 and 1.4 before revision 65679, when configured to allow unauthenticated calls, sends "early audio" to an unverified source IP address of a NEW message, which allows remote attackers to cause a denial of service (traffic amplification) via a spoofed NEW message.

Frequently asked questions

What is CVE-2008-1923?: The IAX2 channel driver (chan_iax2) in Asterisk 1.2 before revision 72630 and 1.4 before revision 65679, when configured to allow unauthenticated calls, sends "early audio" to an unverified source IP address of a NEW message, which allows remote attackers to cause a denial of service (traffic amplification) via a spoofed NEW message.
How severe is CVE-2008-1923?: CVE-2008-1923 has a CVSS 2.0 base score of 7.1, rated high severity.
Is CVE-2008-1923 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2008-1923?: CVE-2008-1923 primarily affects Asterisk Asterisk Appliance Developer Kit. In total, 136 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2008-1923?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2008-1923 published?: CVE-2008-1923 was published on 2008-04-23 and last updated on 2026-06-16.

References

Affected products (136)

cpe:2.3:a:asterisk:asterisk_appliance_developer_kit:*:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:*:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:a:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:b.1.3.2:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:b.1.3.3:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:b.2.2.0:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:b.2.2.1:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:b.2.3.1:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:b.2.3.2:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:b.2.3.3:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:b.2.3.4:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:b.2.5.0:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:c.1.0-beta7:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:c.1.0-beta8:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:c.1.0beta7:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:c.1.6.1:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisknow:*:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisknow:1.0:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisknow:1.0.1:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.0:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.0.0:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.0.1:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.0.2:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.0.3:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.0.4:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.0.5:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.0.6:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.0.7:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.0.8:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.0.9:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.0.11:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.0.11.1:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.0.12:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.0:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.1:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.2:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.3:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.3:netsec:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.4:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.4:netsec:*:*:*:*:*:*

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