How severe is CVE-2008-3263?

CVE-2008-3263 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2008-3263 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 28% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2008-3263?

CVE-2008-3263 primarily affects Asterisk. In total, 108 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2008-3263?

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-2008-3263 published?

CVE-2008-3263 was published on 2008-07-22 and last updated on 2026-06-16.

CVE-2008-3263

CVE-2008-3263 is a high-severity vulnerability in Asterisk with a CVSS 2.0 base score of 7.8. Its EPSS exploit-prediction score of 28% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-399.

Key facts

Severity: High (CVSS 2.0 base score 7.8)
EPSS exploit prediction: 28% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Asterisk
Published: 2008-07-22
Last modified: 2026-06-16

Description

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; Business Edition A.x.x, B.x.x before B.2.5.4, and C.x.x before C.1.10.3; AsteriskNOW; Appliance Developer Kit 0.x.x; and s800i 1.0.x before 1.2.0.1 allows remote attackers to cause a denial of service (call-number exhaustion and CPU consumption) by quickly sending a large number of IAX2 (IAX) POKE requests.

Frequently asked questions

What is CVE-2008-3263?: 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; Business Edition A.x.x, B.x.x before B.2.5.4, and C.x.x before C.1.10.3; AsteriskNOW; Appliance Developer Kit 0.x.x; and s800i 1.0.x before 1.2.0.1 allows remote attackers to cause a denial of service (call-number exhaustion and CPU consumption) by quickly sending a large number of IAX2 (IAX) POKE requests.
How severe is CVE-2008-3263?: CVE-2008-3263 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-2008-3263 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 28% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2008-3263?: CVE-2008-3263 primarily affects Asterisk. In total, 108 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2008-3263?: 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-2008-3263 published?: CVE-2008-3263 was published on 2008-07-22 and last updated on 2026-06-16.

References

Affected products (108)

cpe:2.3:a:asterisk:asterisk:0.1.0:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk:0.1.1:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk:0.1.2:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk:0.1.3:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk:0.1.4:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk:0.1.5:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk:0.1.6:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk:0.1.7:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk:0.1.8:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk:0.1.9:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk:0.1.9_1:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk:0.1.10:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk:0.1.11:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk:0.1.12:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk:0.2:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk:0.3:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk:0.4:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk:0.5.0:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk:0.7.0:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk:0.7.1:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk:0.7.2:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk:0.9.0:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk:1.0:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk:1.0:rc1:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk:1.0.1:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk:1.0.2:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk:1.0.3:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk:1.0.4:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk:1.0.5:*:*:*:*:*:*:*
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:1.0.11.1:*:*:*:*:*:*:*
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:1.2.1:*:*:*:*:*:*:*

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