CVE-2005-0022: Undefined Security Weakness

Buffer overflow in the spabase64tobits function in Exim before 4.43, as originally obtained from Samba code, and as called by the authspaclient function, may allow attackers to execute arbitrary code during SPA authentication...

exim -- two buffer overflow vulnerabilities

The function hostaton can overflow a buffer if it is presented with an illegal IPv6 address that has more than 8 components. 2. The second report described a buffer overflow in the function spabase64tobits, which is part of the code for SPA authentication...