HOMEVULNERABILITIESCVE-2017-17850
HIGH

CVE-2017-17850

CWE-20Published: December 27, 2017· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

An issue was discovered in Asterisk 13.18.4 and older, 14.7.4 and older, 15.1.4 and older, and 13.18-cert1 and older. A select set of SIP messages create a dialog in Asterisk. Those SIP messages must contain a contact header. For those messages, if the header was not present and the PJSIP channel driver was used, Asterisk would crash. The severity of this vulnerability is somewhat mitigated if authentication is enabled. If authentication is enabled, a user would have to first be authorized before reaching the crash point.

NVD Source

Technical Analysis

CVE-2017-17850 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

digium2 product(s)
asteriskcertified asterisk
Source: NVD CPE · 3 total CPE entries

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

ADVISORYhttp://downloads.asterisk.org/pub/security/AST-2017-014.html
ADVISORYhttp://www.securitytracker.com/id/1040056
ADVISORYhttps://issues.asterisk.org/jira/browse/ASTERISK-27480
ADVISORYhttp://downloads.asterisk.org/pub/security/AST-2017-014.html
ADVISORYhttp://www.securitytracker.com/id/1040056
ADVISORYhttps://issues.asterisk.org/jira/browse/ASTERISK-27480

All References (8)

→
http://downloads.asterisk.org/pub/security/AST-2017-014.htmlVendor Advisory
→
http://www.securitytracker.com/id/1040056Third Party Advisory · VDB Entry
→
https://issues.asterisk.org/jira/browse/ASTERISK-27480Issue Tracking · Vendor Advisory
→
https://security.gentoo.org/glsa/201811-11
→
http://downloads.asterisk.org/pub/security/AST-2017-014.htmlVendor Advisory
→
http://www.securitytracker.com/id/1040056Third Party Advisory · VDB Entry
→
https://issues.asterisk.org/jira/browse/ASTERISK-27480Issue Tracking · Vendor Advisory
→
https://security.gentoo.org/glsa/201811-11

Quick Facts

CVE IDCVE-2017-17850
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-20
CISA KEVNo
Affected1 vendor(s)
PublishedDec 27, 2017

Related CVEs (CWE-20)

CVE-2026-0848
10.0
CVE-2011-4755
10.0
CVE-2009-1300
10.0
CVE-2026-48055
10.0
CVE-2026-12537
10.0
CVE-2026-48277
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2017-17850 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.
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