CVE-2011-2536
EPSS 0.19%
Description
chan_sip.c in the SIP channel driver in Asterisk Open Source 1.4.x before 1.4.41.2, 1.6.2.x before 1.6.2.18.2, and 1.8.x before 1.8.4.4, and Asterisk Business Edition C.3.x before C.3.7.3, disregards the alwaysauthreject option and generates different responses for invalid SIP requests depending on whether the user account exists, which allows remote attackers to enumerate account names via a series of requests.
How to fix CVE-2011-2536
To remediate CVE-2011-2536, upgrade the affected package to a fixed version below.
- Debian/asterisk—upgrade to 1:1.8.4.4~dfsg-1 or later
Is CVE-2011-2536 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 1:1.8.4.4~dfsg-1