CVE-2020-26950

{"containers": {"cna": {"affected": [{"product": "Firefox", "vendor": "Mozilla", "versions": [{"status": "affected", "version": "< 82.0.3"}]}, {"product": "Firefox ESR", "vendor": "Mozilla", "versions": [{"status": "affected", "version": "< 78.4.1"}]}, {"product": "Thunderbird", "vendor": "Mozilla", "versions": [{"status": "affected", "version": "< 78.4.2"}]}], "descriptions": [{"lang": "en", "value": "In 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."}], "problemTypes": [{"descriptions": [{"description": "Write side effects in MCallGetProperty opcode not accounted for", "lang": "en", "type": "text"}]}], "providerMetadata": {"dateUpdated": "2022-03-01T17:06:11.000Z", "orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "shortName": "mozilla"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1675905"}, {"tags": ["x_refsource_CONFIRM"], "url": "https://www.mozilla.org/security/advisories/mfsa2020-49/"}, {"tags": ["x_refsource_MISC"], "url": "http://packetstormsecurity.com/files/166175/Firefox-MCallGetProperty-Write-Side-Effects-Use-After-Free.html"}], "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security@mozilla.org", "ID": "CVE-2020-26950", "STATE": "PUBLIC"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "Firefox", "version": {"version_data": [{"version_value": "< 82.0.3"}]}}, {"product_name": "Firefox ESR", "version": {"version_data": [{"version_value": "< 78.4.1"}]}}, {"product_name": "Thunderbird", "version": {"version_data": [{"version_value": "< 78.4.2"}]}}]}, "vendor_name": "Mozilla"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "In 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."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "Write side effects in MCallGetProperty opcode not accounted for"}]}]}, "references": {"reference_data": [{"name": "https://bugzilla.mozilla.org/show_bug.cgi?id=1675905", "refsource": "MISC", "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1675905"}, {"name": "https://www.mozilla.org/security/advisories/mfsa2020-49/", "refsource": "CONFIRM", "url": "https://www.mozilla.org/security/advisories/mfsa2020-49/"}, {"name": "http://packetstormsecurity.com/files/166175/Firefox-MCallGetProperty-Write-Side-Effects-Use-After-Free.html", "refsource": "MISC", "url": "http://packetstormsecurity.com/files/166175/Firefox-MCallGetProperty-Write-Side-Effects-Use-After-Free.html"}]}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T16:03:22.903Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1675905"}, {"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://www.mozilla.org/security/advisories/mfsa2020-49/"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "http://packetstormsecurity.com/files/166175/Firefox-MCallGetProperty-Write-Side-Effects-Use-After-Free.html"}]}]}, "cveMetadata": {"assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "assignerShortName": "mozilla", "cveId": "CVE-2020-26950", "datePublished": "2020-12-09T00:19:22.000Z", "dateReserved": "2020-10-12T00:00:00.000Z", "dateUpdated": "2024-08-04T16:03:22.903Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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{"affected": [{"affectedData": [{"product": "Firefox", "vendor": "Mozilla", "versions": [{"status": "affected", "version": "< 82.0.3"}]}, {"product": "Firefox ESR", "vendor": "Mozilla", "versions": [{"status": "affected", "version": "< 78.4.1"}]}, {"product": "Thunderbird", "vendor": "Mozilla", "versions": [{"status": "affected", "version": "< 78.4.2"}]}], "source": "security@mozilla.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*", "matchCriteriaId": "7F743C78-6F4E-4BD7-A878-B887A2C42BDC", "versionEndExcluding": "82.0.3", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*", "matchCriteriaId": "08D6779A-1193-446D-AE3E-D859D539A170", "versionEndExcluding": "78.4.1", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*", "matchCriteriaId": "635C87C4-E16B-4320-A339-45C8E1DF0401", "versionEndExcluding": "78.4.2", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In 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."}, {"lang": "es", "value": "En determinadas circunstancias, el opcode MCallGetProperty puede ser emitido con suposiciones no cumplidas, resultando en una condici\u00f3n de uso de la memoria previamente liberada explotable. Esta vulnerabilidad afecta a Firefox versiones anteriores a 82.0.3, Firefox ESR versiones anteriores a 78.4.1, y Thunderbird versiones anteriores a 78.4.2"}], "id": "CVE-2020-26950", "lastModified": "2026-06-17T03:08:36.207", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "HIGH", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "COMPLETE", "baseScore": 9.3, "confidentialityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "vectorString": "AV:N/AC:M/Au:N/C:C/I:C/A:C", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 10.0, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": true}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2020-12-09T01:15:12.503", "references": [{"source": "security@mozilla.org", "tags": ["Exploit", "Third Party Advisory", "VDB Entry"], "url": "http://packetstormsecurity.com/files/166175/Firefox-MCallGetProperty-Write-Side-Effects-Use-After-Free.html"}, {"source": "security@mozilla.org", "tags": ["Exploit", "Issue Tracking", "Vendor Advisory"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1675905"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2020-49/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Third Party Advisory", "VDB Entry"], "url": "http://packetstormsecurity.com/files/166175/Firefox-MCallGetProperty-Write-Side-Effects-Use-After-Free.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Issue Tracking", "Vendor Advisory"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1675905"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2020-49/"}], "sourceIdentifier": "security@mozilla.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"acknowledgement": "Red Hat would like to thank the Mozilla project for reporting this issue. Upstream acknowledges 360\u653f\u4f01\u5b89\u5168\u6f0f\u6d1e\u7814\u7a76\u9662 in Tianfu Cup 2020 International Cybersecurity Contest as the original reporter.", "affected_release": [{"advisory": "RHSA-2020:5104", "cpe": "cpe:/o:redhat:enterprise_linux:6", "package": "firefox-0:78.4.1-1.el6_10", "product_name": "Red Hat Enterprise Linux 6", "release_date": "2020-11-12T00:00:00Z"}, {"advisory": "RHSA-2020:5164", "cpe": "cpe:/o:redhat:enterprise_linux:6", "impact": "important", "package": "thunderbird-0:78.4.3-1.el6_10", "product_name": "Red Hat Enterprise Linux 6", "release_date": "2020-11-23T00:00:00Z"}, {"advisory": "RHSA-2020:5099", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "firefox-0:78.4.1-1.el7_9", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2020-11-12T00:00:00Z"}, {"advisory": "RHSA-2020:5163", "cpe": "cpe:/o:redhat:enterprise_linux:7", "impact": "important", "package": "thunderbird-0:78.4.3-1.el7_9", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2020-11-23T00:00:00Z"}, {"advisory": "RHSA-2020:5100", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "firefox-0:78.4.1-1.el8_3", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2020-11-12T00:00:00Z"}, {"advisory": "RHSA-2020:5146", "cpe": "cpe:/a:redhat:enterprise_linux:8", "impact": "important", "package": "thunderbird-0:78.4.3-1.el8_3", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2020-11-18T00:00:00Z"}, {"advisory": "RHSA-2020:5138", "cpe": "cpe:/a:redhat:rhel_e4s:8.0", "package": "firefox-0:78.4.1-1.el8_0", "product_name": "Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions", "release_date": "2020-11-17T00:00:00Z"}, {"advisory": "RHSA-2020:5167", "cpe": "cpe:/a:redhat:rhel_e4s:8.0", "package": "thunderbird-0:78.4.3-1.el8_0", "product_name": "Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions", "release_date": "2020-11-23T00:00:00Z"}, {"advisory": "RHSA-2020:5135", "cpe": "cpe:/a:redhat:rhel_eus:8.1", "package": "firefox-0:78.4.1-1.el8_1", "product_name": "Red Hat Enterprise Linux 8.1 Extended Update Support", "release_date": "2020-11-17T00:00:00Z"}, {"advisory": "RHSA-2020:5166", "cpe": "cpe:/a:redhat:rhel_eus:8.1", "package": "thunderbird-0:78.4.3-1.el8_1", "product_name": "Red Hat Enterprise Linux 8.1 Extended Update Support", "release_date": "2020-11-23T00:00:00Z"}, {"advisory": "RHSA-2020:5139", "cpe": "cpe:/a:redhat:rhel_eus:8.2", "package": "firefox-0:78.4.1-1.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2020-11-17T00:00:00Z"}, {"advisory": "RHSA-2020:5162", "cpe": "cpe:/a:redhat:rhel_eus:8.2", "package": "thunderbird-0:78.4.3-1.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2020-11-23T00:00:00Z"}], "bugzilla": {"description": "Mozilla: Write side effects in MCallGetProperty opcode not accounted for", "id": "1896306", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1896306"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.8", "cvss3_scoring_vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-416", "details": ["In 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."], "name": "CVE-2020-26950", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Out of support scope", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Out of support scope", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 5"}], "public_date": "2020-11-09T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2020-26950\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-26950\nhttps://www.mozilla.org/en-US/security/advisories/mfsa2020-49/#CVE-2020-26950"], "threat_severity": "Critical"}

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