What’s Vulnerable › Vulnerabilities

CVE-2017-17850

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 75.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-12-27 · updated 2026-06-17
• Weakness: CWE-20

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.

Affected products

• Digium Asterisk: from 13.0.0 through 13.18.4; from 14.0.0 through 14.7.4; from 15.0.0 through 15.1.4
• Digium Certified Asterisk: 13.1.0, 13.1.0-rc1, 13.1.0-rc2, 13.8-cert1

References

• http://downloads.asterisk.org/pub/security/AST-2017-014.html
• http://www.securitytracker.com/id/1040056
• https://issues.asterisk.org/jira/browse/ASTERISK-27480
• https://security.gentoo.org/glsa/201811-11
• http://downloads.asterisk.org/pub/security/AST-2017-014.html
• http://www.securitytracker.com/id/1040056
• https://issues.asterisk.org/jira/browse/ASTERISK-27480
• https://security.gentoo.org/glsa/201811-11

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