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No exploitation reportedFix available

CVE-2016-7551

No exploitation reported by the sources we read.

  • Published2017-04-17
  • WeaknessCWE-399

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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).

Timeline

dates in UTC
  1. 2017-04-1716:59CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2016-7551?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2016-7551?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Digium asterisk
BranchAffectedFixed in
11.0= 11.0.0no fix published
11.0= 11.0.1no fix published
11.0= 11.0.2no fix published
11.1= 11.1.0no fix published
11.1= 11.1.1no fix published
11.1= 11.1.2no fix published
11.2= 11.2.0no fix published
11.2= 11.2.1no fix published
11.2= 11.2.2no fix published
11.3= 11.3.0no fix published
11.4= 11.4.0no fix published
11.5= 11.5.0no fix published
Digium certified asterisk
BranchAffectedFixed in
11.6= 11.6no fix published
11.6= 11.6.0no fix published
13.8= 13.8no fix published
13.8= 13.8.0no fix published
Debian debian linux
BranchAffectedFixed in
8.0= 8.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • NVDCVSS 3.07.5read 2026-10-23
  • NVDCVSS 2.05read 2026-10-23
  • NVDweakness (CWE)CWE-399read 2026-10-23
  • FIRST EPSSEPSS score5.3 %2026-10-22

Technical details

CVSS v3 Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2017-04-17
Last Modified
2026-06-17
NVD status
Modified

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).

Is CVE-2016-7551 actively exploited?

Active exploitation of CVE-2016-7551 has not been confirmed. Its EPSS score was 5.3% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2016-7551?

CVE-2016-7551 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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