The SIP channel driver (chan_sip) in Asterisk before 1.2.18 and 1.4.x
before 1.4.3 does not properly parse SIP UDP packets that do not
contain a valid response code, which allows remote attackers to cause
a denial of service (crash).
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the CVE-ID was allocated or reserved, and does not
necessarily indicate when this vulnerability was
discovered, shared with the affected vendor, publicly
disclosed, or updated in CVE.
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