{"id":"CVE-2019-11708","published":"2019-07-23T14:15:15Z","modified":"2026-06-17T02:13:28Z","title":"Mozilla Firefox and Thunderbird Sandbox Escape Vulnerability","vendor":"Mozilla","product":"Firefox and Thunderbird","tier":"core","eol":null,"description":{"text":"Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the non-sandboxed parent process opening web content chosen by a compromised child process. When combined with additional vulnerabilities this could result in executing arbitrary code on the user's computer. This vulnerability affects Firefox ESR < 60.7.2, Firefox < 67.0.4, and Thunderbird < 60.7.2.","provenance":"source","from":"NVD"},"summary":{"text":"A flaw in Mozilla Firefox and Thunderbird arises from insufficient validation of parameters carried by the Prompt:Open inter-process message sent from the child (content) process to the non-sandboxed parent process. An attacker who has compromised a child process can use this to make the parent open web content of their choosing, which, combined with additional vulnerabilities, could lead to arbitrary code execution on the user's computer; the attack requires only network access and no privileges or user interaction.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:09:39Z"},"cvss":{"score":10.0,"severity":"CRITICAL","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.55874,"percentile":0.9904,"date":"2026-10-28","provenance":"source"},"kev":{"dateAdded":"2022-05-23","dueDate":"2022-06-13","ransomware":false,"requiredAction":"Apply updates per vendor instructions.","notes":"https://nvd.nist.gov/vuln/detail/CVE-2019-11708","provenance":"source"},"vulncheckKev":{"dateAdded":"2019-06-20","exploitedFirstSeen":"2019-06-20","ransomware":false,"evidence":[{"url":"https://docs.google.com/spreadsheets/d/1lkNJ0uQwbeC1ZTRrxdtuPLCIl7mlUreoKfSIgajnSyY/edit","date":"2019-06-20"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2022-05-23"},{"url":"https://www.zimperium.com/blog/the-case-of-cloud9-chrome-botnet/","date":"2022-11-08"}],"evidenceTotal":3,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 21, 2026","url":"https://otx.alienvault.com/pulse/6ad78130c4d1ac2be83a8b6d","created":"2026-10-20"},{"name":"Actively_Exploited_Kev | Oct 20, 2026","url":"https://otx.alienvault.com/pulse/6ad62f63c24a405a3423cc13","created":"2026-10-19"},{"name":"Actively_Exploited_Kev | Oct 19, 2026","url":"https://otx.alienvault.com/pulse/6ad4dda174e5797d0bd238b7","created":"2026-10-18"},{"name":"Actively_Exploited_Kev | Oct 18, 2026","url":"https://otx.alienvault.com/pulse/6ad38c22e1848f8189d1c121","created":"2026-10-17"}],"provenance":"machine"},"cwes":[{"id":"CWE-20","name":"Improper Input Validation"}],"references":[{"url":"http://packetstormsecurity.com/files/155592/Mozilla-Firefox-Windows-64-Bit-Chain-Exploit.html","tags":["Third Party Advisory","VDB Entry"]},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1559858","tags":["Issue Tracking","Vendor Advisory"]},{"url":"https://security.gentoo.org/glsa/201908-12","tags":["Third Party Advisory"]},{"url":"https://www.mozilla.org/security/advisories/mfsa2019-19/","tags":["Vendor Advisory"]},{"url":"https://www.mozilla.org/security/advisories/mfsa2019-20/","tags":["Vendor Advisory"]},{"url":"http://packetstormsecurity.com/files/155592/Mozilla-Firefox-Windows-64-Bit-Chain-Exploit.html","tags":["Third Party Advisory","VDB Entry"]},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1559858","tags":["Issue Tracking","Vendor Advisory"]},{"url":"https://security.gentoo.org/glsa/201908-12","tags":["Third Party Advisory"]},{"url":"https://www.mozilla.org/security/advisories/mfsa2019-19/","tags":["Vendor Advisory"]},{"url":"https://www.mozilla.org/security/advisories/mfsa2019-20/","tags":["Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-11708","tags":["US Government Resource"]}],"techniques":[{"id":"T1133","name":"External Remote Services","tactics":["initial-access","persistence"],"provenance":"source","basis":"ctid-cve","bases":["ctid-cve"],"basisDetail":"CTID attack_to_cve (Phase 1)","mappingType":"uncategorized","evidence":[],"confidence":"low","confidenceNote":"CTID attack_to_cve Phase 1 \"Uncategorized\" mapping (not staged by impact)"},{"id":"T1190","name":"Exploit Public-Facing Application","tactics":["initial-access"],"provenance":"source","basis":"ctid-cve","bases":["ctid-cve"],"basisDetail":"CTID attack_to_cve (Phase 1)","mappingType":"uncategorized","evidence":[],"confidence":"low","confidenceNote":"CTID attack_to_cve Phase 1 \"Uncategorized\" mapping (not staged by impact)"},{"id":"T1211","name":"Exploitation for Stealth","tactics":["stealth"],"provenance":"source","basis":"ctid-cve","bases":["ctid-cve"],"basisDetail":"CTID attack_to_cve (Phase 1)","mappingType":"uncategorized","evidence":[],"confidence":"low","confidenceNote":"CTID attack_to_cve Phase 1 \"Uncategorized\" mapping (not staged by impact)"},{"id":"T1189","name":"Drive-by Compromise","tactics":["initial-access"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Content process compromise via malicious web content","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"a compromised child process","start":187,"end":214}],"model":"claude-haiku-5-5","confidence":"low","confidenceNote":"server-side bug exploitable without user interaction; client-execution technique does not fit"},{"id":"T1068","name":"Exploitation for Privilege Escalation","tactics":["privilege-escalation"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Escapes sandbox to gain higher privileges","mappingType":"primary_impact","evidence":[{"from":"description","quote":"could result in executing arbitrary code on the user's computer","start":267,"end":330}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2019-3378","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2019-3378","exploited":true,"exploitedSince":"2022-05-23","provenance":"source"},"exploits":[{"id":47752,"url":"https://www.exploit-db.com/exploits/47752","title":"Mozilla FireFox (Windows 10 x64) - Full Chain Client Side Attack","type":"local","platform":"windows_x86-64","date":"2019-12-07","verified":false,"provenance":"source"}],"exploitSources":{"exploitdb":{"count":1,"earliest":"2019-12-07"},"pocGithub":{"count":1,"skipped":0,"earliest":"2019-09-29","earliestUrl":"https://github.com/0vercl0k/CVE-2019-11708","repos":[{"name":"0vercl0k/CVE-2019-11708","url":"https://github.com/0vercl0k/CVE-2019-11708","stars":626,"created":"2019-09-29"}]},"first":{"date":"2019-09-29","source":"PoC-in-GitHub","url":"https://github.com/0vercl0k/CVE-2019-11708"},"provenance":"source"},"exploitRefs":["http://packetstormsecurity.com/files/155592/Mozilla-Firefox-Windows-64-Bit-Chain-Exploit.html"],"flow":[{"stage":"primary","techniques":["T1068"],"provenance":"ai"},{"stage":"related","techniques":["T1133","T1189","T1190","T1211"],"provenance":"ai","lowConfidence":true}],"timeline":[{"date":"2019-06-20","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://docs.google.com/spreadsheets/d/1lkNJ0uQwbeC1ZTRrxdtuPLCIl7mlUreoKfSIgajnSyY/edit","provenance":"source"},{"date":"2019-07-23","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2019-11708","provenance":"source"},{"date":"2019-09-29","kind":"exploit-public","label":"First public exploit: PoC-in-GitHub; later: Exploit-DB 2019-12-07","url":"https://github.com/0vercl0k/CVE-2019-11708","provenance":"source"},{"date":"2022-05-23","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2022-05-23","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2019-3378","provenance":"source"}],"speed":{"daysToPublicExploit":68,"firstExploitFrom":"PoC-in-GitHub","daysToKev":1035},"priority":{"score":69.8,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":0.0,"detail":"added 2688 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.81,"detail":"percentile 0.9904"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"1 Exploit-DB entry; 1 NVD exploit link; 1 PoC-in-GitHub repo"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"50 pulses"},{"name":"CVSS severity","points":7.0,"detail":"base score 10.0"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}