How severe is CVE-2008-5558?

CVE-2008-5558 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2008-5558 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2008-5558?

CVE-2008-5558 primarily affects Asterisk Asterisk Business Edition. In total, 17 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2008-5558?

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

When was CVE-2008-5558 published?

CVE-2008-5558 was published on 2008-12-17 and last updated on 2026-06-16.

CVE-2008-5558

CVE-2008-5558 is a medium-severity vulnerability in Asterisk Asterisk Business Edition with a CVSS 2.0 base score of 4.3. 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-287.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Asterisk Asterisk Business Edition
Published: 2008-12-17
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2008-5558?: CVE-2008-5558 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2008-5558 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2008-5558?: CVE-2008-5558 primarily affects Asterisk Asterisk Business Edition. In total, 17 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2008-5558?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2008-5558 published?: CVE-2008-5558 was published on 2008-12-17 and last updated on 2026-06-16.

References

Affected products (17)

cpe:2.3:a:asterisk:asterisk_business_edition:b.2.3.4:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:b.2.3.5:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:b.2.5.0:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:b.2.5.1:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:b.2.5.3:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.26:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.26:netsec:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.26.1:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.26.1:netsec:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.26.2:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.26.2:netsec:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.27:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.28:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.29:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.30:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.30.2:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.30.3:*:*:*:*:*:*:*

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CVE-2008-1289 — High (CVSS 7.5): Multiple buffer overflows in Asterisk Open Source 1.4.x before 1.4.18.1 and 1.4.19-rc3, Open Source 1.6.x before…
CVE-2008-1923 — High (CVSS 7.1): The IAX2 channel driver (chan_iax2) in Asterisk 1.2 before revision 72630 and 1.4 before revision 65679, when…
CVE-2009-0041 — Medium (CVSS 5.0): IAX2 in Asterisk Open Source 1.2.x before 1.2.31, 1.4.x before 1.4.23-rc4, and 1.6.x before 1.6.0.3-rc2; Business…

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