The vulnerabilities of the functions AppendEncodedAttributeValue(), ExtraSpaceNeededForAttrEncoding(), and AppendEncodedCharacters() in browsers Mozilla Firefox, Firefox ESR, and the email client Thunderbird allow an attacker to execute arbitrary code.

The vulnerabilities of the functions AppendEncodedAttributeValue, ExtraSpaceNeededForAttrEncoding, and AppendEncodedCharacters in browsers such as Mozilla Firefox, Firefox ESR, and the email client Thunderbird are related to integer overflow. Exploiting these vulnerabilities allows a malicious...

Mozilla: Integer overflow could have led to out of bounds write

The Mozilla Foundation Security Advisory describes this flaw as: AppendEncodedAttributeValue, ExtraSpaceNeededForAttrEncoding and AppendEncodedCharacters could have experienced integer overflows, causing underallocation of an output buffer leading to an out of bounds write...