Multiple unspecified vulnerabilities in the layout engine in Mozilla Firefox before 1.5.0.10 and 2.x before 2.0.0.2, Thunderbird before 1.5.0.10, and SeaMonkey before 1.0.8 allow remote attackers to cause a denial of service (crash) and potentially execute arbitrary code via certain vectors.

Mozilla Firefox before 1.5.0.5, Thunderbird before 1.5.0.5, and SeaMonkey before 1.0.3 allows remote attackers to reference remote files and possibly load chrome: URLs by tricking the user into copying or dragging links.

Mozilla Firefox 1.5.0.4 and earlier allows remote user-assisted attackers to cause a denial of service (crash) via a form with a multipart/form-data encoding and a user-uploaded file. NOTE: a third party has claimed that this issue might be related to the LiveHTTPHeaders extension.

HTTP response smuggling vulnerability in Mozilla Firefox and Thunderbird before 1.5.0.4, when used with certain proxy servers, allows remote attackers to cause Firefox to interpret certain responses as if they were responses from two different sites via (1) invalid HTTP response headers with spaces between the header name and the colon, which might not be ignored in some cases, or (2) HTTP 1.1 headers through an HTTP 1.0 proxy, which are ignored by the proxy but processed by the client.

IE Tab 1.0.9 plugin for Mozilla Firefox 1.5.0.3 allows remote user-assisted attackers to cause a denial of service (application crash), possibly due to a null dereference, via certain Javascript, as demonstrated using a url parameter to the content/reloaded.html page in a chrome:// URI. Some third-party researchers claim that they are unable to reproduce this vulnerability.

Mozilla Firefox 1.5.0.3 allows remote attackers to cause a denial of service via a web page with a large number of IMG elements in which the SRC attribute is a mailto URI. NOTE: another researcher found that the web page caused a temporary browser slowdown instead of a crash.