How severe is CVE-2011-4063?

CVE-2011-4063 has a CVSS 2.0 base score of 6.8, rated medium severity.

Is CVE-2011-4063 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-4063?

CVE-2011-4063 primarily affects Asterisk Open Source. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-4063?

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

When was CVE-2011-4063 published?

CVE-2011-4063 was published on 2011-10-21 and last updated on 2026-06-16.

CVE-2011-4063

CVE-2011-4063 is a medium-severity vulnerability in Asterisk Open Source with a CVSS 2.0 base score of 6.8. 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-20.

Key facts

Severity: Medium (CVSS 2.0 base score 6.8)
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Asterisk Open Source
Published: 2011-10-21
Last modified: 2026-06-16

Description

chan_sip.c in the SIP channel driver in Asterisk Open Source 1.8.x before 1.8.7.1 and 10.x before 10.0.0-rc1 does not properly initialize variables during request parsing, which allows remote authenticated users to cause a denial of service (daemon crash) via a malformed request.

Frequently asked questions

What is CVE-2011-4063?: chan_sip.c in the SIP channel driver in Asterisk Open Source 1.8.x before 1.8.7.1 and 10.x before 10.0.0-rc1 does not properly initialize variables during request parsing, which allows remote authenticated users to cause a denial of service (daemon crash) via a malformed request.
How severe is CVE-2011-4063?: CVE-2011-4063 has a CVSS 2.0 base score of 6.8, rated medium severity.
Is CVE-2011-4063 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-4063?: CVE-2011-4063 primarily affects Asterisk Open Source. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-4063?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-4063 published?: CVE-2011-4063 was published on 2011-10-21 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:asterisk:open_source:1.8.7:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:10.0.0:*:*:*:*:*:*:*

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