Field Assessment
AI analysis pending.
CVE
CVE-2011-4597
Severity
MEDIUM
CVSS
5
EPSS
3.16%
Original Filing — NVD Description
The SIP over UDP implementation in Asterisk Open Source 1.4.x before 1.4.43, 1.6.x before 1.6.2.21, and 1.8.x before 1.8.7.2 uses different port numbers for responses to invalid requests depending on whether a SIP username exists, which allows remote attackers to enumerate usernames via a series of requests.