View at Official ubuntu advisory, NVD, CVE.org · CVE detail
Freshness: upstream tracker timestamp is available; use API updated time as primary recency signal.
CVE-2011-4063 medium priority: Ubuntu including 1 source packages (asterisk), 9 status rows across 9 suites (hardy, lucid, maverick, natty, oneiric, precise, quantal, raring, upstream): not-affected 6, ignored 2, released 1.
chan_sip.c in the SIP channel driver in Asterisk Open Source 1.8.x before 1.8.7.1 and 10.x before 10.0.0-rc1 does not properly initialize variables during request parsing, which allows remote authenticated users to cause a denial of service (daemon crash) via a malformed request.