How severe is CVE-2016-7551?

CVE-2016-7551 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2016-7551 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-7551?

CVE-2016-7551 primarily affects Digium Asterisk. In total, 113 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-7551?

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-2016-7551 published?

CVE-2016-7551 was published on 2017-04-17 and last updated on 2026-06-17.

CVE-2016-7551

CVE-2016-7551 is a high-severity vulnerability in Digium Asterisk with a CVSS 3.x base score of 7.5. 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-399.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 5% (92nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Digium Asterisk
Published: 2017-04-17
Last modified: 2026-06-17

Description

chain_sip in Asterisk Open Source 11.x before 11.23.1 and 13.x 13.11.1 and Certified Asterisk 11.6 before 11.6-cert15 and 13.8 before 13.8-cert3 allows remote attackers to cause a denial of service (port exhaustion).

Frequently asked questions

What is CVE-2016-7551?: chain_sip in Asterisk Open Source 11.x before 11.23.1 and 13.x 13.11.1 and Certified Asterisk 11.6 before 11.6-cert15 and 13.8 before 13.8-cert3 allows remote attackers to cause a denial of service (port exhaustion).
How severe is CVE-2016-7551?: CVE-2016-7551 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2016-7551 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-7551?: CVE-2016-7551 primarily affects Digium Asterisk. In total, 113 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-7551?: 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-2016-7551 published?: CVE-2016-7551 was published on 2017-04-17 and last updated on 2026-06-17.

References

Affected products (113)

cpe:2.3:a:digium:asterisk:11.0.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.0.0:beta1:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.0.0:beta2:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.0.0:rc1:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.0.0:rc2:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.0.1:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.0.2:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.1.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.1.0:rc1:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.1.0:rc3:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.1.1:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.1.2:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.2.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.2.0:rc1:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.2.0:rc2:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.2.1:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.2.2:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.3.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.4.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.5.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.5.1:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.6.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.6.1:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.7.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.8.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.8.1:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.9.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.10.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.10.1:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.10.2:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.11.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.12.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.12.1:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.13.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.13.1:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.14.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.14.1:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.14.2:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.15.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:11.15.1:*:*:*:*:*:*:*

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Other CWE-399 (Resource Management Errors) vulnerabilities

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