CVE-2017-16671: Digium Asterisk

High severity, CVSS 8.8. EPSS: 3.3% chance of exploitation in the next 30 days.

A Buffer Overflow issue was discovered in Asterisk Open Source 13 before 13.18.1, 14 before 14.7.1, and 15 before 15.1.1 and Certified Asterisk 13.13 before 13.13-cert7. No size checking is done when setting the user field for Party B on a CDR. Thus, it is possible for someone to use an arbitrarily large string and write past the end of the user field storage buffer. NOTE: this is different from CVE-2017-7617, which was only about the Party A buffer.

Affected products

• Digium Asterisk: from 13.0.0, before 13.18.1 (fixed in 13.18.1); from 14.0.0, before 14.7.1 (fixed in 14.7.1); from 15.0.0, before 15.1.1 (fixed in 15.1.1)
• Digium Certified Asterisk: version 13.13.0 only

Published 2017-11-09. Last modified 2026-06-17.