{"vulnerability": "cve-2020-26950", "sightings": [{"uuid": "9bff4815-3725-43a1-a08e-3235a528916e", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2020-26950", "type": "seen", "source": "MISP/a1e796df-2ad8-4c8d-8b69-737a004e72dd", "content": "", "creation_timestamp": "2025-02-06T03:13:44.000000Z"}, {"uuid": "5ef5a294-d0ea-40ab-8ea6-7cc7efc8f73e", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2020-26950", "type": "seen", "source": "MISP/a1e796df-2ad8-4c8d-8b69-737a004e72dd", "content": "", "creation_timestamp": "2025-02-23T04:10:27.000000Z"}, {"uuid": "72dc4880-a788-46e7-b4db-2474d841b3c9", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2020-26950", "type": "seen", "source": "https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/browser/firefox_jit_use_after_free.rb", "content": "", "creation_timestamp": "2022-02-28T20:58:50.000000Z"}, {"uuid": "64fef903-e95d-4982-8f66-20aa4f4267eb", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2020-26950", "type": "published-proof-of-concept", "source": "https://t.me/tech_b0lt_Genona/3004", "content": "\u0418\u043d\u0442\u0435\u0440\u0435\u0441\u043d\u044b\u0439 \u0438 \u043f\u043e\u0434\u0440\u043e\u0431\u043d\u044b\u0439 \u043f\u043e\u0441\u0442 \u0441 \u0440\u0430\u0437\u0431\u043e\u0440\u043e\u043c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438. \u041d\u0435 \u0432\u0441\u0451 \u043f\u043e\u043d\u044f\u0442\u043d\u043e, \u043d\u043e \u043e\u0447\u0435\u043d\u044c \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u043d\u043e.\n\nFirefox JIT Use-After-Frees | Exploiting CVE-2020-26950\nhttps://www.sentinelone.com/labs/firefox-jit-use-after-frees-exploiting-cve-2020-26950/\n+\nhttps://twitter.com/maxpl0it/status/1489283212786475008\n\n\u0417\u0430 \u0441\u0441\u044b\u043b\u043a\u0443 \u0441\u043f\u0430\u0441\u0438\u0431\u043e @oleg_log", "creation_timestamp": "2022-02-07T01:27:55.000000Z"}, {"uuid": "d86b2620-b34d-4565-994d-fb008cddf755", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2020-26950", "type": "published-proof-of-concept", "source": "Telegram/btm5SLvUOoyhagAz9qWDZIMUnhAODnwsBlwYthgMl24Nat56", "content": "", "creation_timestamp": "2022-02-03T19:29:25.000000Z"}, {"uuid": "94b3c9c2-f145-45a2-b2c8-b862109755c9", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2020-26950", "type": "seen", "source": "https://t.me/cibsecurity/17709", "content": "\u203c CVE-2020-26950 \u203c\n\nIn certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.\n\n\ud83d\udcd6 Read\n\nvia \"National Vulnerability Database\".", "creation_timestamp": "2020-12-09T16:02:04.000000Z"}, {"uuid": "fcde358b-d0e7-4557-8ac7-7cbb93d42989", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2020-26950", "type": "seen", "source": "https://t.me/cibsecurity/17612", "content": "\u203c CVE-2020-26950 \u203c\n\nIn certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.\n\n\ud83d\udcd6 Read\n\nvia \"National Vulnerability Database\".", "creation_timestamp": "2020-12-09T13:25:16.000000Z"}, {"uuid": "52d53fd9-4206-4024-b482-69a9a9c45f6a", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2020-26950", "type": "seen", "source": "https://t.me/cibsecurity/17747", "content": "\u203c CVE-2020-26950 \u203c\n\nIn certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.\n\n\ud83d\udcd6 Read\n\nvia \"National Vulnerability Database\".", "creation_timestamp": "2020-12-09T16:22:33.000000Z"}, {"uuid": "1b2c000a-605d-4101-8b3d-ccf252ebf8b4", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2020-26950", "type": "seen", "source": "https://t.me/cibsecurity/17517", "content": "\u203c CVE-2020-26950 \u203c\n\nIn certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.\n\n\ud83d\udcd6 Read\n\nvia \"National Vulnerability Database\".", "creation_timestamp": "2020-12-09T10:25:20.000000Z"}, {"uuid": "bf8be2e1-aa8c-403c-9f50-c8cbc4a18d57", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2020-26950", "type": "seen", "source": "https://t.me/cibsecurity/17767", "content": "\u203c CVE-2020-26950 \u203c\n\nIn certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.\n\n\ud83d\udcd6 Read\n\nvia \"National Vulnerability Database\".", "creation_timestamp": "2020-12-09T16:25:15.000000Z"}, {"uuid": "7d69aab6-e0c5-4052-b0b3-2eadd5a94e2a", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2020-26950", "type": "seen", "source": "https://t.me/cibsecurity/17728", "content": "\u203c CVE-2020-26950 \u203c\n\nIn certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.\n\n\ud83d\udcd6 Read\n\nvia \"National Vulnerability Database\".", "creation_timestamp": "2020-12-09T16:05:05.000000Z"}, {"uuid": "1b4ace2b-017a-4e16-8812-94393f808b3a", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2020-26950", "type": "seen", "source": "https://t.me/cibsecurity/17690", "content": "\u203c CVE-2020-26950 \u203c\n\nIn certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.\n\n\ud83d\udcd6 Read\n\nvia \"National Vulnerability Database\".", "creation_timestamp": "2020-12-09T15:31:15.000000Z"}, {"uuid": "d237dea6-fdf8-4161-a6e6-7c959ef37e15", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2020-26950", "type": "seen", "source": "https://t.me/cibsecurity/17670", "content": "\u203c CVE-2020-26950 \u203c\n\nIn certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.\n\n\ud83d\udcd6 Read\n\nvia \"National Vulnerability Database\".", "creation_timestamp": "2020-12-09T15:25:10.000000Z"}, {"uuid": "0f6e7394-4587-4ea9-9f7a-8cbe25c4d879", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2020-26950", "type": "seen", "source": "https://t.me/cibsecurity/17650", "content": "\u203c CVE-2020-26950 \u203c\n\nIn certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.\n\n\ud83d\udcd6 Read\n\nvia \"National Vulnerability Database\".", "creation_timestamp": "2020-12-09T15:22:33.000000Z"}, {"uuid": "1da4b996-3aad-48d7-b895-7969398af5e5", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2020-26950", "type": "seen", "source": "https://t.me/cibsecurity/17632", "content": "\u203c CVE-2020-26950 \u203c\n\nIn certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.\n\n\ud83d\udcd6 Read\n\nvia \"National Vulnerability Database\".", "creation_timestamp": "2020-12-09T14:25:11.000000Z"}, {"uuid": "35a7d366-413b-4903-8324-10dd98c5c82b", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2020-26950", "type": "seen", "source": "https://t.me/cibsecurity/17592", "content": "\u203c CVE-2020-26950 \u203c\n\nIn certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.\n\n\ud83d\udcd6 Read\n\nvia \"National Vulnerability Database\".", "creation_timestamp": "2020-12-09T12:41:04.000000Z"}, {"uuid": "3691d1e0-50bc-43e1-83f3-815ed03db20b", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2020-26950", "type": "seen", "source": "https://t.me/cibsecurity/17557", "content": "\u203c CVE-2020-26950 \u203c\n\nIn certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.\n\n\ud83d\udcd6 Read\n\nvia \"National Vulnerability Database\".", "creation_timestamp": "2020-12-09T12:25:17.000000Z"}, {"uuid": "da021b7a-ae1f-49ff-abf8-930a4bd2ef0b", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2020-26950", "type": "seen", "source": "https://t.me/cibsecurity/17572", "content": "\u203c CVE-2020-26950 \u203c\n\nIn certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.\n\n\ud83d\udcd6 Read\n\nvia \"National Vulnerability Database\".", "creation_timestamp": "2020-12-09T12:32:09.000000Z"}, {"uuid": "0d765c67-f571-4106-9f92-fa5aa128562e", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2020-26950", "type": "seen", "source": "https://t.me/cibsecurity/17477", "content": "\u203c CVE-2020-26950 \u203c\n\nIn certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.\n\n\ud83d\udcd6 Read\n\nvia \"National Vulnerability Database\".", "creation_timestamp": "2020-12-09T08:25:25.000000Z"}, {"uuid": "ad7d520e-e3cb-4aef-8ce6-f2c4828dff92", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2020-26950", "type": "seen", "source": "https://t.me/cibsecurity/17537", "content": "\u203c CVE-2020-26950 \u203c\n\nIn certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.\n\n\ud83d\udcd6 Read\n\nvia \"National Vulnerability Database\".", "creation_timestamp": "2020-12-09T11:25:20.000000Z"}, {"uuid": "28f1a8dd-92e8-43f7-af28-3edea453f62a", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2020-26950", "type": "seen", "source": "https://t.me/cibsecurity/17497", "content": "\u203c CVE-2020-26950 \u203c\n\nIn certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.\n\n\ud83d\udcd6 Read\n\nvia \"National Vulnerability Database\".", "creation_timestamp": "2020-12-09T09:25:32.000000Z"}, {"uuid": "9bf53a6a-2d86-4f6a-bd5a-cb5089346057", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2020-26950", "type": "seen", "source": "https://t.me/information_security_channel/41580", "content": "Vulnerabilities Exploited at Chinese Hacking Contest Patched in Firefox, Chrome\nhttp://feedproxy.google.com/~r/Securityweek/~3/hP13HG40N-I/vulnerabilities-exploited-chinese-hacking-contest-patched-firefox-chrome\n\nMozilla and Google have already patched the critical Firefox and Chrome vulnerabilities exploited recently by white hat hackers at a competition in China.\nThe Firefox vulnerability, tracked as CVE-2020-26950, has been described as an issue related to write side effects in MCallGetProperty opcode not being accounted for.\nread more (https://www.securityweek.com/vulnerabilities-exploited-chinese-hacking-contest-patched-firefox-chrome)", "creation_timestamp": "2020-11-11T15:07:50.000000Z"}, {"uuid": "9fc86ad5-23b4-45ff-b9b2-aba203d21890", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2020-26950", "type": "published-proof-of-concept", "source": "https://t.me/CyberSecurityTechnologies/5392", "content": "#Threat_Research\n1. Firefox JIT Use-After-Frees:\nExploiting CVE-2020-26950\nhttps://www.sentinelone.com/labs/firefox-jit-use-after-frees-exploiting-cve-2020-26950\n2. A walk through Project Zero metrics:\nBug fix time 2019-2021\nhttps://googleprojectzero.blogspot.com/2022/02/a-walk-through-project-zero-metrics.html", "creation_timestamp": "2022-02-11T11:04:01.000000Z"}, {"uuid": "33257018-59c4-43d1-8a18-ffef90522a2e", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2020-26950", "type": "seen", "source": "https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/browser/firefox_jit_use_after_free.rb", "content": "{\"aliases\": [], \"arch\": \"x64\", \"author\": [\"360 ESG Vulnerability Research Institute\", \"maxpl0it\", \"timwr\"], \"autofilter_ports\": [], \"autofilter_services\": [], \"check\": false, \"default_credential\": false, \"description\": \"This modules exploits CVE-2020-26950, a use after free exploit in Firefox.\\n          The MCallGetProperty opcode can be emitted with unmet assumptions resulting\\n          in an exploitable use-after-free condition.\\n\\n          This exploit uses a somewhat novel technique of spraying ArgumentsData\\n          structures in order to construct primitives. The shellcode is forced into\\n          executable memory via the JIT compiler, and executed by writing to the JIT\\n          region pointer.\\n\\n          This exploit does not contain a sandbox escape, so firefox must be run\\n          with the MOZ_DISABLE_CONTENT_SANDBOX environment variable set, in order\\n          for the shellcode to run successfully.\\n\\n          This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and\\n          Thunderbird < 78.4.2, however only Firefox <= 79 is supported as a target.\\n          Additional work may be needed to support other versions such as Firefox 82.0.1.\", \"disclosure_date\": \"2020-11-18\", \"fullname\": \"exploit/multi/browser/firefox_jit_use_after_free\", \"is_install_path\": true, \"mod_time\": \"2022-02-26 12:35:38 +0000\", \"name\": \"Firefox MCallGetProperty Write Side Effects Use After Free Exploit\", \"needs_cleanup\": null, \"notes\": {\"Reliability\": [\"repeatable-session\"], \"SideEffects\": [\"ioc-in-logs\"], \"Stability\": [\"crash-safe\"]}, \"path\": \"/modules/exploits/multi/browser/firefox_jit_use_after_free.rb\", \"platform\": \"Linux,Windows\", \"post_auth\": false, \"rank\": 0, \"ref_name\": \"multi/browser/firefox_jit_use_after_free\", \"references\": [\"CVE-2020-26950\", \"URL-https://www.mozilla.org/en-US/security/advisories/mfsa2020-49/#CVE-2020-26950\", \"URL-https://bugzilla.mozilla.org/show_bug.cgi?id=1675905\", \"URL-https://www.sentinelone.com/labs/firefox-jit-use-after-frees-exploiting-cve-2020-26950/\"], \"rport\": null, \"session_types\": false, \"targets\": [\"Automatic\"], \"type\": \"exploit\"}", "creation_timestamp": "2026-09-08T06:49:35.426762Z"}]}