Buffer overflow in eStara Softphone 3.0.1.14 through 3.0.1.46 allows remote attackers to execute arbitrary code via a long attribute (aka "a") field in the SDP data of a SIP packet on UDP port 5060.

eStara SIP softphone allows remote attackers to cause a denial of service (crash) via a SIP OPTIONS request with a negative Expires field.

Multiple format string vulnerabilities in eStara SIP softphone allow remote attackers to cause a denial of service (hang) via SIP INVITE requests with format string specifiers in the SDP session description, as demonstrated using (1) the field name, (2) the o field (owner/creator and session identifier), or (3) the m field (media name and transport address).

eStara SIP softphone allows remote attackers to cause a denial of service (crash) via an INVITE request with a Content-Length field that has more than 9 digits.