CVE-2021-29945

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{"affected": [{"affectedData": [{"product": "Firefox ESR", "vendor": "Mozilla", "versions": [{"lessThan": "78.10", "status": "affected", "version": "unspecified", "versionType": "custom"}]}, {"product": "Thunderbird", "vendor": "Mozilla", "versions": [{"lessThan": "78.10", "status": "affected", "version": "unspecified", "versionType": "custom"}]}, {"product": "Firefox", "vendor": "Mozilla", "versions": [{"lessThan": "88", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "source": "security@mozilla.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:x86:*", "matchCriteriaId": "93A024F9-E2A3-4F13-83A3-879EAC032592", "versionEndExcluding": "88.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:x86:*", "matchCriteriaId": "504327C0-E11F-4EAC-9ED3-8BEA4C40DD0C", "versionEndExcluding": "78.10", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:x86:*", "matchCriteriaId": "65A9C7EC-D89C-4C03-841E-9DFED53E5795", "versionEndExcluding": "78.10", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The WebAssembly JIT could miscalculate the size of a return type, which could lead to a null read and result in a crash. *Note: This issue only affected x86-32 platforms. Other platforms are unaffected.*. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88."}, {"lang": "es", "value": "El JIT de WebAssembly pod\u00eda calcular mal el tama\u00f1o de un tipo de retorno, lo que pod\u00eda conllevar a una lectura nula y resultar en un bloqueo. *Nota: Este problema s\u00f3lo afectaba a las plataformas x86-32. Otras plataformas no est\u00e1n afectadas. Esta vulnerabilidad afecta a Firefox ESR versiones anteriores a 78.10, Thunderbird versiones anteriores a 78.10 y Firefox versiones anteriores a 88"}], "id": "CVE-2021-29945", "lastModified": "2026-06-17T03:48:29.313", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 4.3, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": true}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-06-24T14:15:09.763", "references": [{"source": "security@mozilla.org", "tags": ["Issue Tracking", "Permissions Required", "Vendor Advisory"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1700690"}, {"source": "security@mozilla.org", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2021-14/"}, {"source": "security@mozilla.org", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2021-15/"}, {"source": "security@mozilla.org", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2021-16/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking", "Permissions Required", "Vendor Advisory"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1700690"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2021-14/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2021-15/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2021-16/"}], "sourceIdentifier": "security@mozilla.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-682"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"acknowledgement": "Red Hat would like to thank the Mozilla project for reporting this issue. Upstream acknowledges Christian Holler as the original reporter.", "affected_release": [{"advisory": "RHSA-2021:1350", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "thunderbird-0:78.10.0-1.el7_9", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2021-04-26T00:00:00Z"}, {"advisory": "RHSA-2021:1363", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "firefox-0:78.10.0-1.el7_9", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2021-04-26T00:00:00Z"}, {"advisory": "RHSA-2021:1353", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "thunderbird-0:78.10.0-1.el8_3", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-04-26T00:00:00Z"}, {"advisory": "RHSA-2021:1360", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "firefox-0:78.10.0-1.el8_3", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-04-26T00:00:00Z"}, {"advisory": "RHSA-2021:1351", "cpe": "cpe:/a:redhat:rhel_eus:8.1", "package": "thunderbird-0:78.10.0-1.el8_1", "product_name": "Red Hat Enterprise Linux 8.1 Extended Update Support", "release_date": "2021-04-26T00:00:00Z"}, {"advisory": "RHSA-2021:1362", "cpe": "cpe:/a:redhat:rhel_eus:8.1", "package": "firefox-0:78.10.0-1.el8_1", "product_name": "Red Hat Enterprise Linux 8.1 Extended Update Support", "release_date": "2021-04-26T00:00:00Z"}, {"advisory": "RHSA-2021:1352", "cpe": "cpe:/a:redhat:rhel_eus:8.2", "package": "thunderbird-0:78.10.0-1.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2021-04-26T00:00:00Z"}, {"advisory": "RHSA-2021:1361", "cpe": "cpe:/a:redhat:rhel_eus:8.2", "package": "firefox-0:78.10.0-1.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2021-04-26T00:00:00Z"}], "bugzilla": {"description": "Mozilla: Incorrect size computation in WebAssembly JIT could lead to null-reads", "id": "1951370", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1951370"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.1", "cvss3_scoring_vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "status": "verified"}, "cwe": "CWE-476", "details": ["The WebAssembly JIT could miscalculate the size of a return type, which could lead to a null read and result in a crash. *Note: This issue only affected x86-32 platforms. Other platforms are unaffected.*. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88."], "name": "CVE-2021-29945", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 6"}], "public_date": "2021-04-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-29945\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-29945\nhttps://www.mozilla.org/en-US/security/advisories/mfsa2021-15/#CVE-2021-29945"], "threat_severity": "Moderate"}

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