{"id":"CVE-2006-4253","aliases":["DEBIAN-CVE-2006-4253","EUVD-2006-4241","GHSA-42hr-qcx2-4fr6","RHSA-2006:0675","RHSA-2006:0676","RHSA-2006:0677"],"status":"published","title":"Concurrency vulnerability in Mozilla Firefox 1.5.0.6 and earlier allows remote attackers to cause...","description":"Concurrency vulnerability in Mozilla Firefox 1.5.0.6 and earlier allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via multiple Javascript timed events that load a deeply nested XML file, followed by redirecting the browser to another page, which leads to a concurrency failure that causes structures to be freed incorrectly, as demonstrated by (1) ffoxdie and (2) ffoxdie3.  NOTE: it has been reported that Netscape 8.1 and K-Meleon 1.0.1 are also affected by ffoxdie.  Mozilla confirmed to CVE that ffoxdie and ffoxdie3 trigger the same underlying vulnerability.  NOTE: it was later reported that Firefox 2.0 RC2 and 1.5.0.7 are also affected.","severity":{"version":"2.0","score":7.6,"vector":"AV:N/AC:H/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.15185,"percentile":0.96772,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":true},"cwes":["CWE-264"],"published":"2006-08-21T20:00:00Z","modified":"2026-10-22T23:47:19Z","exploits":[{"source":"exploitdb","id":"EDB-28380","title":"Mozilla Firefox 1.0.x - JavaScript Handler Race Condition Memory 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