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.

Published: 2008-04-23 Last update: 2026-04-23 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2008-1923 is rated Moderate Risk (52.4/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.40%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2008-1923

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.52% 1.40% -0.12%
2 2025-03-30 1.26% 1.52% +0.26%
3 2025-03-29 — 1.26% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2008-1923

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.1 2.0 HIGH
AV:N/AC:M/Au:N/C:N/I:N/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.6 6.9 [email protected]

Weakness enumeration for CVE-2008-1923

OS Trackers for CVE-2008-1923

vendor priority summary link
debian medium CVE-2008-1923 medium priority: Debian including 1 source packages (asterisk), 2 status rows across 2 suites (bullseye, sid): resolved 2. https://security-tracker.debian.org/tracker/CVE-2008-1923
ubuntu medium CVE-2008-1923 medium priority: Ubuntu including 1 source packages (asterisk), 8 status rows across 8 suites (dapper, feisty, gutsy, hardy, intrepid, jaunty, karmic, upstream): not-affected 4, ignored 3, needs-triage 1. https://ubuntu.com/security/CVE-2008-1923

Affected software / configurations for CVE-2008-1923

Vendor Product Version Raw CPE
asterisk asterisk_appliance_developer_kit — cpe:2.3:a:asterisk:asterisk_appliance_developer_kit:*:*:*:*:*:*:*:*
asterisk asterisk_business_edition <= b2.5.1 cpe:2.3:a:asterisk:asterisk_business_edition:*:*:*:*:*:*:*:*
asterisk asterisk_business_edition <= c1.8.0 cpe:2.3:a:asterisk:asterisk_business_edition:*:*:*:*:*:*:*:*
asterisk asterisk_business_edition a cpe:2.3:a:asterisk:asterisk_business_edition:a:*:*:*:*:*:*:*
asterisk asterisk_business_edition b.1.3.2 cpe:2.3:a:asterisk:asterisk_business_edition:b.1.3.2:*:*:*:*:*:*:*
asterisk asterisk_business_edition b.1.3.3 cpe:2.3:a:asterisk:asterisk_business_edition:b.1.3.3:*:*:*:*:*:*:*
asterisk asterisk_business_edition b.2.2.0 cpe:2.3:a:asterisk:asterisk_business_edition:b.2.2.0:*:*:*:*:*:*:*
asterisk asterisk_business_edition b.2.2.1 cpe:2.3:a:asterisk:asterisk_business_edition:b.2.2.1:*:*:*:*:*:*:*
asterisk asterisk_business_edition b.2.3.1 cpe:2.3:a:asterisk:asterisk_business_edition:b.2.3.1:*:*:*:*:*:*:*
asterisk asterisk_business_edition b.2.3.2 cpe:2.3:a:asterisk:asterisk_business_edition:b.2.3.2:*:*:*:*:*:*:*
asterisk asterisk_business_edition b.2.3.3 cpe:2.3:a:asterisk:asterisk_business_edition:b.2.3.3:*:*:*:*:*:*:*
asterisk asterisk_business_edition b.2.3.4 cpe:2.3:a:asterisk:asterisk_business_edition:b.2.3.4:*:*:*:*:*:*:*
asterisk asterisk_business_edition b.2.5.0 cpe:2.3:a:asterisk:asterisk_business_edition:b.2.5.0:*:*:*:*:*:*:*
asterisk asterisk_business_edition c.1.0-beta7 cpe:2.3:a:asterisk:asterisk_business_edition:c.1.0-beta7:*:*:*:*:*:*:*
asterisk asterisk_business_edition c.1.0-beta8 cpe:2.3:a:asterisk:asterisk_business_edition:c.1.0-beta8:*:*:*:*:*:*:*
asterisk asterisk_business_edition c.1.0beta7 cpe:2.3:a:asterisk:asterisk_business_edition:c.1.0beta7:*:*:*:*:*:*:*
asterisk asterisk_business_edition c.1.6.1 cpe:2.3:a:asterisk:asterisk_business_edition:c.1.6.1:*:*:*:*:*:*:*
asterisk asterisknow <= 1.0.2 cpe:2.3:a:asterisk:asterisknow:*:*:*:*:*:*:*:*
asterisk asterisknow 1.0 cpe:2.3:a:asterisk:asterisknow:1.0:*:*:*:*:*:*:*
asterisk asterisknow 1.0.1 cpe:2.3:a:asterisk:asterisknow:1.0.1:*:*:*:*:*:*:*
asterisk open_source 1.0 cpe:2.3:a:asterisk:open_source:1.0:*:*:*:*:*:*:*
asterisk open_source 1.0.0 cpe:2.3:a:asterisk:open_source:1.0.0:*:*:*:*:*:*:*
asterisk open_source 1.0.1 cpe:2.3:a:asterisk:open_source:1.0.1:*:*:*:*:*:*:*
asterisk open_source 1.0.2 cpe:2.3:a:asterisk:open_source:1.0.2:*:*:*:*:*:*:*
asterisk open_source 1.0.3 cpe:2.3:a:asterisk:open_source:1.0.3:*:*:*:*:*:*:*
asterisk open_source 1.0.4 cpe:2.3:a:asterisk:open_source:1.0.4:*:*:*:*:*:*:*
asterisk open_source 1.0.5 cpe:2.3:a:asterisk:open_source:1.0.5:*:*:*:*:*:*:*
asterisk open_source 1.0.6 cpe:2.3:a:asterisk:open_source:1.0.6:*:*:*:*:*:*:*
asterisk open_source 1.0.7 cpe:2.3:a:asterisk:open_source:1.0.7:*:*:*:*:*:*:*
asterisk open_source 1.0.8 cpe:2.3:a:asterisk:open_source:1.0.8:*:*:*:*:*:*:*
asterisk open_source 1.0.9 cpe:2.3:a:asterisk:open_source:1.0.9:*:*:*:*:*:*:*
asterisk open_source 1.0.11 cpe:2.3:a:asterisk:open_source:1.0.11:*:*:*:*:*:*:*
asterisk open_source 1.0.11.1 cpe:2.3:a:asterisk:open_source:1.0.11.1:*:*:*:*:*:*:*
asterisk open_source 1.0.12 cpe:2.3:a:asterisk:open_source:1.0.12:*:*:*:*:*:*:*
asterisk open_source 1.2.0 cpe:2.3:a:asterisk:open_source:1.2.0:*:*:*:*:*:*:*
asterisk open_source 1.2.1 cpe:2.3:a:asterisk:open_source:1.2.1:*:*:*:*:*:*:*
asterisk open_source 1.2.2 cpe:2.3:a:asterisk:open_source:1.2.2:*:*:*:*:*:*:*
asterisk open_source 1.2.3 cpe:2.3:a:asterisk:open_source:1.2.3:*:*:*:*:*:*:*
asterisk open_source 1.2.3 cpe:2.3:a:asterisk:open_source:1.2.3:netsec:*:*:*:*:*:*
asterisk open_source 1.2.4 cpe:2.3:a:asterisk:open_source:1.2.4:*:*:*:*:*:*:*
asterisk open_source 1.2.4 cpe:2.3:a:asterisk:open_source:1.2.4:netsec:*:*:*:*:*:*
asterisk open_source 1.2.5 cpe:2.3:a:asterisk:open_source:1.2.5:*:*:*:*:*:*:*
asterisk open_source 1.2.5 cpe:2.3:a:asterisk:open_source:1.2.5:netsec:*:*:*:*:*:*
asterisk open_source 1.2.6 cpe:2.3:a:asterisk:open_source:1.2.6:*:*:*:*:*:*:*
asterisk open_source 1.2.6 cpe:2.3:a:asterisk:open_source:1.2.6:netsec:*:*:*:*:*:*
asterisk open_source 1.2.7 cpe:2.3:a:asterisk:open_source:1.2.7:*:*:*:*:*:*:*
asterisk open_source 1.2.7 cpe:2.3:a:asterisk:open_source:1.2.7:netsec:*:*:*:*:*:*
asterisk open_source 1.2.7.1 cpe:2.3:a:asterisk:open_source:1.2.7.1:*:*:*:*:*:*:*
asterisk open_source 1.2.7.1 cpe:2.3:a:asterisk:open_source:1.2.7.1:netsec:*:*:*:*:*:*
asterisk open_source 1.2.8 cpe:2.3:a:asterisk:open_source:1.2.8:*:*:*:*:*:*:*
asterisk open_source 1.2.8 cpe:2.3:a:asterisk:open_source:1.2.8:netsec:*:*:*:*:*:*
asterisk open_source 1.2.9 cpe:2.3:a:asterisk:open_source:1.2.9:*:*:*:*:*:*:*
asterisk open_source 1.2.9.1 cpe:2.3:a:asterisk:open_source:1.2.9.1:*:*:*:*:*:*:*
asterisk open_source 1.2.9.1 cpe:2.3:a:asterisk:open_source:1.2.9.1:netsec:*:*:*:*:*:*
asterisk open_source 1.2.10 cpe:2.3:a:asterisk:open_source:1.2.10:*:*:*:*:*:*:*
asterisk open_source 1.2.10 cpe:2.3:a:asterisk:open_source:1.2.10:netsec:*:*:*:*:*:*
asterisk open_source 1.2.11 cpe:2.3:a:asterisk:open_source:1.2.11:*:*:*:*:*:*:*
asterisk open_source 1.2.11 cpe:2.3:a:asterisk:open_source:1.2.11:netsec:*:*:*:*:*:*
asterisk open_source 1.2.12 cpe:2.3:a:asterisk:open_source:1.2.12:*:*:*:*:*:*:*
asterisk open_source 1.2.12 cpe:2.3:a:asterisk:open_source:1.2.12:netsec:*:*:*:*:*:*
asterisk open_source 1.2.12.1 cpe:2.3:a:asterisk:open_source:1.2.12.1:*:*:*:*:*:*:*
asterisk open_source 1.2.13 cpe:2.3:a:asterisk:open_source:1.2.13:*:*:*:*:*:*:*
asterisk open_source 1.2.13 cpe:2.3:a:asterisk:open_source:1.2.13:netsec:*:*:*:*:*:*
asterisk open_source 1.2.14 cpe:2.3:a:asterisk:open_source:1.2.14:*:*:*:*:*:*:*
asterisk open_source 1.2.14 cpe:2.3:a:asterisk:open_source:1.2.14:netsec:*:*:*:*:*:*
asterisk open_source 1.2.15 cpe:2.3:a:asterisk:open_source:1.2.15:*:*:*:*:*:*:*
asterisk open_source 1.2.15 cpe:2.3:a:asterisk:open_source:1.2.15:netsec:*:*:*:*:*:*
asterisk open_source 1.2.16 cpe:2.3:a:asterisk:open_source:1.2.16:*:*:*:*:*:*:*
asterisk open_source 1.2.16 cpe:2.3:a:asterisk:open_source:1.2.16:netsec:*:*:*:*:*:*
asterisk open_source 1.2.17 cpe:2.3:a:asterisk:open_source:1.2.17:*:*:*:*:*:*:*
asterisk open_source 1.2.17 cpe:2.3:a:asterisk:open_source:1.2.17:netsec:*:*:*:*:*:*
asterisk open_source 1.2.18 cpe:2.3:a:asterisk:open_source:1.2.18:*:*:*:*:*:*:*
asterisk open_source 1.2.18 cpe:2.3:a:asterisk:open_source:1.2.18:netsec:*:*:*:*:*:*
asterisk open_source 1.2.19 cpe:2.3:a:asterisk:open_source:1.2.19:*:*:*:*:*:*:*
asterisk open_source 1.2.19 cpe:2.3:a:asterisk:open_source:1.2.19:netsec:*:*:*:*:*:*
asterisk open_source 1.2.20 cpe:2.3:a:asterisk:open_source:1.2.20:*:*:*:*:*:*:*
asterisk open_source 1.2.20 cpe:2.3:a:asterisk:open_source:1.2.20:netsec:*:*:*:*:*:*
asterisk open_source 1.2.21 cpe:2.3:a:asterisk:open_source:1.2.21:*:*:*:*:*:*:*
asterisk open_source 1.2.21 cpe:2.3:a:asterisk:open_source:1.2.21:netsec:*:*:*:*:*:*
asterisk open_source 1.2.21.1 cpe:2.3:a:asterisk:open_source:1.2.21.1:*:*:*:*:*:*:*

References for CVE-2008-1923

cvelogic Threat Intelligence