HIGH
CVE-2016-7551
CWE-399Published: April 17, 2017· Updated: Jun 17, 2026
7.5
CVSS v3.1
Official 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).
Technical Analysis
CVE-2016-7551 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Vendors & Products
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (10)
→
http://downloads.asterisk.org/pub/security/AST-2016-007.htmlMitigation · Vendor Advisory
→
http://www.debian.org/security/2016/dsa-3700Third Party Advisory
→
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=838832Issue Tracking · Patch · Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=1374733Issue Tracking · Patch
→
https://issues.asterisk.org/jira/browse/ASTERISK-26272Issue Tracking · Patch · Third Party Advisory
→
http://downloads.asterisk.org/pub/security/AST-2016-007.htmlMitigation · Vendor Advisory
→
http://www.debian.org/security/2016/dsa-3700Third Party Advisory
→
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=838832Issue Tracking · Patch · Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=1374733Issue Tracking · Patch
→
https://issues.asterisk.org/jira/browse/ASTERISK-26272Issue Tracking · Patch · Third Party Advisory
Quick Facts
CVE IDCVE-2016-7551
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-399
CISA KEVNo
Affected2 vendor(s)
PublishedApr 17, 2017
Related CVEs (CWE-399)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2016-7551 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.