CVE-2008-5558

Asterisk Open Source 1.2.26 through 1.2.30.3 and Business Edition B.2.3.5 through B.2.5.5, when realtime IAX2 users are enabled, allows remote attackers to cause a denial of service (crash) via authentication attempts involving (1) an unknown user or (2) a user using hostname matching.

Published: 2008-12-17 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2008-5558 is rated Moderate Risk (44.1/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.96%). 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-2008-5558

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 2.26% 1.96% -0.30%
2 2026-05-13 2.11% 2.26% +0.15%
3 2025-07-05 — 2.11% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2008-5558

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:N/A:P 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:P)
Partial availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2008-5558

OS Trackers for CVE-2008-5558

vendor priority summary link
debian not yet assigned CVE-2008-5558 not yet assigned priority: Debian including 1 source packages (asterisk), 2 status rows across 2 suites (bullseye, sid): resolved 2. https://security-tracker.debian.org/tracker/CVE-2008-5558
gentoo normal CVE-2008-5558: 1 GLSA(s) (200905-01), 1 atom(s) (net-misc/asterisk); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2008-5558
ubuntu medium CVE-2008-5558 medium priority: Ubuntu including 1 source packages (asterisk), 7 status rows across 7 suites (dapper, gutsy, hardy, intrepid, jaunty, karmic, upstream): not-affected 5, ignored 1, needs-triage 1. https://ubuntu.com/security/CVE-2008-5558

Affected software / configurations for CVE-2008-5558

Vendor Product Version Raw CPE
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.2.3.5 cpe:2.3:a:asterisk:asterisk_business_edition:b.2.3.5:*:*:*:*:*:*:*
asterisk asterisk_business_edition b.2.5.0 cpe:2.3:a:asterisk:asterisk_business_edition:b.2.5.0:*:*:*:*:*:*:*
asterisk asterisk_business_edition b.2.5.1 cpe:2.3:a:asterisk:asterisk_business_edition:b.2.5.1:*:*:*:*:*:*:*
asterisk asterisk_business_edition b.2.5.3 cpe:2.3:a:asterisk:asterisk_business_edition:b.2.5.3:*:*:*:*:*:*:*
asterisk open_source 1.2.26 cpe:2.3:a:asterisk:open_source:1.2.26:*:*:*:*:*:*:*
asterisk open_source 1.2.26 cpe:2.3:a:asterisk:open_source:1.2.26:netsec:*:*:*:*:*:*
asterisk open_source 1.2.26.1 cpe:2.3:a:asterisk:open_source:1.2.26.1:*:*:*:*:*:*:*
asterisk open_source 1.2.26.1 cpe:2.3:a:asterisk:open_source:1.2.26.1:netsec:*:*:*:*:*:*
asterisk open_source 1.2.26.2 cpe:2.3:a:asterisk:open_source:1.2.26.2:*:*:*:*:*:*:*
asterisk open_source 1.2.26.2 cpe:2.3:a:asterisk:open_source:1.2.26.2:netsec:*:*:*:*:*:*
asterisk open_source 1.2.27 cpe:2.3:a:asterisk:open_source:1.2.27:*:*:*:*:*:*:*
asterisk open_source 1.2.28 cpe:2.3:a:asterisk:open_source:1.2.28:*:*:*:*:*:*:*
asterisk open_source 1.2.29 cpe:2.3:a:asterisk:open_source:1.2.29:*:*:*:*:*:*:*
asterisk open_source 1.2.30 cpe:2.3:a:asterisk:open_source:1.2.30:*:*:*:*:*:*:*
asterisk open_source 1.2.30.2 cpe:2.3:a:asterisk:open_source:1.2.30.2:*:*:*:*:*:*:*
asterisk open_source 1.2.30.3 cpe:2.3:a:asterisk:open_source:1.2.30.3:*:*:*:*:*:*:*

References for CVE-2008-5558

cvelogic Threat Intelligence