How severe is CVE-2007-4455?

CVE-2007-4455 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2007-4455 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2007-4455?

CVE-2007-4455 primarily affects Asterisk. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2007-4455?

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

When was CVE-2007-4455 published?

CVE-2007-4455 was published on 2007-08-22 and last updated on 2026-06-16.

CVE-2007-4455

CVE-2007-4455 is a medium-severity vulnerability in Asterisk with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Asterisk
Published: 2007-08-22
Last modified: 2026-06-16

Description

The SIP channel driver (chan_sip) in Asterisk Open Source 1.4.x before 1.4.11, AsteriskNOW before beta7, Asterisk Appliance Developer Kit 0.x before 0.8.0, and s800i (Asterisk Appliance) 1.x before 1.0.3 allows remote attackers to cause a denial of service (memory exhaustion) via a SIP dialog that causes a large number of history entries to be created.

Frequently asked questions

What is CVE-2007-4455?: The SIP channel driver (chan_sip) in Asterisk Open Source 1.4.x before 1.4.11, AsteriskNOW before beta7, Asterisk Appliance Developer Kit 0.x before 0.8.0, and s800i (Asterisk Appliance) 1.x before 1.0.3 allows remote attackers to cause a denial of service (memory exhaustion) via a SIP dialog that causes a large number of history entries to be created.
How severe is CVE-2007-4455?: CVE-2007-4455 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2007-4455 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2007-4455?: CVE-2007-4455 primarily affects Asterisk. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2007-4455?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2007-4455 published?: CVE-2007-4455 was published on 2007-08-22 and last updated on 2026-06-16.

References

Affected products (3)

cpe:2.3:a:asterisk:asterisk:*:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_appliance_developer_kit:*:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisknow:*:*:*:*:*:*:*:*

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CVE-2007-2488 — Critical (CVSS 10.0): The IAX2 channel driver (chan_iax2) in Asterisk before 20070504 does not properly null terminate data, which allows…
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CVE-2007-3762 — Critical (CVSS 9.3): Stack-based buffer overflow in the IAX2 channel driver (chan_iax2) in Asterisk before 1.2.22 and 1.4.x before 1.4.8,…
CVE-2008-1332 — High (CVSS 8.8): Unspecified vulnerability in Asterisk Open Source 1.2.x before 1.2.27, 1.4.x before 1.4.18.1 and 1.4.19-rc3; Business…
CVE-2009-2346 — High (CVSS 7.8): The IAX2 protocol implementation in Asterisk Open Source 1.2.x before 1.2.35, 1.4.x before 1.4.26.2, 1.6.0.x before…
CVE-2008-3263 — High (CVSS 7.8): 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;…

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