CVE-2021-33641

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{"affected": [{"affectedData": [{"product": "byacc", "vendor": "n/a", "versions": [{"status": "affected", "version": "<1.9.20200330 and <2.0.20210808"}]}], "source": "securities@openeuler.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:openeuler:byacc:*:*:*:*:*:*:*:*", "matchCriteriaId": "C2399FF0-CD0D-4170-B923-1F3F7236B081", "versionEndExcluding": "1.9.20200330", "vulnerable": true}, {"criteria": "cpe:2.3:a:openeuler:byacc:*:*:*:*:*:*:*:*", "matchCriteriaId": "C944FA70-29B9-4A7B-B811-105C327BC3D6", "versionEndExcluding": "2.0.20210808", "versionStartIncluding": "2.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "When processing files, malloc stores the data of the current line. When processing comments, malloc incorrectly accesses the released memory (use after free)."}, {"lang": "es", "value": "Al procesar archivos, malloc almacena los datos de la l\u00ednea actual. Al procesar comentarios, malloc accede incorrectamente a la memoria liberada (\u00fasela despu\u00e9s de liberarla)."}], "id": "CVE-2021-33641", "lastModified": "2026-06-17T03:54:55.340", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-33641", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-04-02T15:37:25.468877Z", "version": "2.0.3"}}]}, "published": "2023-01-20T21:15:10.803", "references": [{"source": "securities@openeuler.org", "tags": ["Permissions Required", "Third Party Advisory"], "url": "https://gitee.com/src-openeuler/byacc/commit/50225f48c6b53e9d7c936681a06682404cb8ec4d"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Permissions Required", "Third Party Advisory"], "url": "https://gitee.com/src-openeuler/byacc/commit/50225f48c6b53e9d7c936681a06682404cb8ec4d"}], "sourceIdentifier": "securities@openeuler.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "securities@openeuler.org", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "byacc: malloc incorrectly accessing released memory leads to use after free", "id": "2183006", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2183006"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L", "status": "draft"}, "cwe": "CWE-416", "details": ["When processing files, malloc stores the data of the current line. When processing comments, malloc incorrectly accesses the released memory (use after free).", "A use-after-free flaw was found in the byacc package. When processing a specially crafted file, malloc incorrectly accesses the released memory."], "name": "CVE-2021-33641", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "byacc", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Will not fix", "package_name": "byacc", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "byacc", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "byacc", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2022-05-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-33641\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-33641"], "threat_severity": "Moderate"}

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