sipdroid is prone to a user-enumeration weakness.
An attacker may leverage this issue to harvest valid usernames, which may aid in brute-force attacks.
sipdroid 1.6.1, 2.0.1, and 2.2 running on Android 2.1 are vulnerable; other versions may also be affected.
Skype for Android is prone to an information-disclosure vulnerability.
Remote attackers can exploit this issue to gain access to sensitive information. This may aid in further attacks.