CVE-2011-4597
EPSS 0.69%asterisk - several
Published: 12/15/2011Modified: 4/28/2026
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.
Affected packages (2)
- Debian/asteriskfrom 0, < 1:1.8.8.0~dfsg-1
- Debian/asteriskfrom 0, < 1:1.6.2.9-2+squeeze4