Buffer overflow in Yahoo! Messenger allows remote attackers to execute arbitrary code via the offline mode.
Yahoo! Messenger 4.0 sends user passwords in cleartext, which could allow remote attackers to gain privileges of other users via sniffing.
The installer in Yahoo! Messenger 4.0, 5.0 and 5.5 does not verify package signatures which could allow remote attackers to install trojan programs via DNS spoofing.
Integer overflow in the CYImage::LoadJPG method in YImage.dll in Yahoo! Messenger before 11.5.0.155, when photo sharing is enabled, might allow remote attackers to execute arbitrary code via a crafted JPG image that triggers a heap-based buffer overflow.
Unspecified vulnerability in the Chat Room functionality in Yahoo! Messenger 8.1.0.239 and earlier allows remote attackers to cause a denial of service via unspecified vectors. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.