CVE-2020-1899

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This type code allowed arbitrary memory addresses to be accessed as if they were static StringData objects. This issue affected HHVM prior to v4.32.3, between versions 4.33.0 and 4.56.0, 4.57.0, 4.58.0, 4.58.1, 4.59.0, 4.60.0, 4.61.0, 4.62.0."}], "problemTypes": [{"descriptions": [{"cweId": "CWE-822", "description": "Untrusted Pointer Dereference (CWE-822)", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2021-03-11T00:55:19.000Z", "orgId": "4fc57720-52fe-4431-a0fb-3d2c8747b827", "shortName": "facebook"}, "references": [{"tags": ["x_refsource_CONFIRM"], "url": "https://hhvm.com/blog/2020/06/30/security-update.html"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/facebook/hhvm/commit/1107228a5128d3ca1c4add8ac1635d933cbbe2e9"}], "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "cve-assign@fb.com", "DATE_ASSIGNED": "2020-06-10", "ID": "CVE-2020-1899", "STATE": "PUBLIC"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "HHVM", "version": {"version_data": [{"version_affected": "!>=", "version_value": "4.62.1"}, {"version_affected": "=", "version_value": "4.62.0"}, {"version_affected": "!>=", "version_value": "4.61.1"}, {"version_affected": "=", "version_value": "4.61.0"}, {"version_affected": "!>=", "version_value": "4.60.1"}, {"version_affected": "=", "version_value": "4.60.0"}, {"version_affected": "!>=", "version_value": "4.59.1"}, {"version_affected": "=", "version_value": "4.59.0"}, {"version_affected": "!>=", "version_value": "4.58.2"}, {"version_affected": ">=", "version_value": "4.58.0"}, {"version_affected": "!>=", "version_value": "4.57.1"}, {"version_affected": "=", "version_value": "4.57.0"}, {"version_affected": "!>=", "version_value": "4.56.1"}, {"version_affected": ">=", "version_value": "4.33.0"}, {"version_affected": "!>=", "version_value": "4.32.3"}, {"version_affected": "<", "version_value": "4.32.3"}]}}]}, "vendor_name": "Facebook"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "The unserialize() function supported a type code, \"S\", which was meant to be supported only for APC serialization. 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This type code allowed arbitrary memory addresses to be accessed as if they were static StringData objects. This issue affected HHVM prior to v4.32.3, between versions 4.33.0 and 4.56.0, 4.57.0, 4.58.0, 4.58.1, 4.59.0, 4.60.0, 4.61.0, 4.62.0."}, {"lang": "es", "value": "La funci\u00f3n unserialize() admit\u00eda un c\u00f3digo de tipo, \"S\", que estaba destinado a ser admitido solo para la serializaci\u00f3n APC.&#xa0;Este c\u00f3digo de tipo permit\u00eda acceder a direcciones de memoria arbitrarias como si fueran objetos StringData est\u00e1ticos.&#xa0;Este problema afect\u00f3 a HHVM versiones anteriores a v4.32.3, entre las versiones 4.33.0 y 4.56.0, 4.57.0, 4.58.0, 4.58.1, 4.59.0, 4.60.0, 4.61.0, 4.62.0"}], "id": "CVE-2020-1899", "lastModified": "2026-06-17T03:02:34.770", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 5.0, "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-03-11T01:15:14.333", "references": [{"source": "cve-assign@fb.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/facebook/hhvm/commit/1107228a5128d3ca1c4add8ac1635d933cbbe2e9"}, {"source": "cve-assign@fb.com", "tags": ["Vendor Advisory"], "url": "https://hhvm.com/blog/2020/06/30/security-update.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/facebook/hhvm/commit/1107228a5128d3ca1c4add8ac1635d933cbbe2e9"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://hhvm.com/blog/2020/06/30/security-update.html"}], "sourceIdentifier": "cve-assign@fb.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-822"}], "source": "cve-assign@fb.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-119"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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