CVE-2009-3373

CVE-2009-3373 describes a critical heap-based buffer overflow vulnerability in the GIF image parser affecting Mozilla Firefox versions prior to 3.0.15 and 3.5.4, and SeaMonkey before 2.0. This flaw allows remote attackers to execute arbitrary code on vulnerable systems. With a CVSS score of 10.0, it presents a severe risk due to its network-based attack vector, low attack complexity, and complete compromise of confidentiality, integrity, and availability. While not listed in CISA's KEV catalog, an exploit for this vulnerability is publicly available on ExploitDB, though there is no evidence of active exploitation or significant community discussion.