CVE-2017-17850

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Summary

CVECVE-2017-17850
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2017-12-27 17:08:20 UTC
Updated2025-04-20 01:37:25 UTC
DescriptionAn 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.

Risk And Classification

Primary CVSS: v3.0 7.5 HIGH from [email protected]

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.299580000 probability, percentile 0.967140000 (date 2026-05-19)

Problem Types: CWE-20 | n/a

VersionSourceTypeScoreSeverityVector
3.0[email protected]Primary7.5HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
2.0[email protected]Primary5AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial

AV:N/AC:L/Au:N/C:N/I:N/A:P

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Digium Asterisk All All All All
Application Digium Asterisk All All All All
Application Digium Asterisk All All All All
Application Digium Certified Asterisk 13.1.0 All All All
Application Digium Certified Asterisk 13.1.0 rc1 All All
Application Digium Certified Asterisk 13.1.0 rc2 All All
Application Digium Certified Asterisk 13.8 cert1 All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
Asterisk: Multiple vulnerabilities (GLSA 201811-11) — Gentoo security af854a3a-2127-422b-91ae-364da2661108 security.gentoo.org
AST-2017-014 af854a3a-2127-422b-91ae-364da2661108 downloads.asterisk.org Vendor Advisory
Asterisk PJSIP Channel Driver Contact Header Processing Error Lets Remote Users Cause the Target Service to Crash - SecurityTracker af854a3a-2127-422b-91ae-364da2661108 www.securitytracker.com Third Party Advisory, VDB Entry
[ASTERISK-27480] Security: Authenticated SUBSCRIBE without Contact crashes asterisk - Digium/Asterisk JIRA af854a3a-2127-422b-91ae-364da2661108 issues.asterisk.org Issue Tracking, Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 710292 Gentoo Linux Asterisk Multiple Vulnerabilities (GLSA 201811-11)
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