{"api_version":"1","generated_at":"2026-05-14T01:32:36+00:00","cve":"CVE-2020-21048","urls":{"html":"https://cve.report/CVE-2020-21048","api":"https://cve.report/api/cve/CVE-2020-21048.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2020-21048","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-21048"},"summary":{"title":"CVE-2020-21048","description":"An issue in the dither.c component of libsixel prior to v1.8.4 allows attackers to cause a denial of service (DOS) via a crafted PNG file.","state":"PUBLISHED","assigner":"mitre","published_at":"2021-09-14 16:15:08","updated_at":"2026-04-24 12:56:58"},"problem_types":["NVD-CWE-noinfo","n/a"],"metrics":[{"version":"3.1","source":"nvd@nist.gov","type":"Primary","score":"6.5","severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","baseScore":6.5,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"2.0","source":"nvd@nist.gov","type":"Primary","score":"4.3","severity":"","vector":"AV:N/AC:M/Au:N/C:N/I:N/A:P","data":{"version":"2.0","vectorString":"AV:N/AC:M/Au:N/C:N/I:N/A:P","baseScore":4.3,"accessVector":"NETWORK","accessComplexity":"MEDIUM","authentication":"NONE","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"PARTIAL"}}],"references":[{"url":"https://github.com/saitoha/libsixel/issues/73","name":"https://github.com/saitoha/libsixel/issues/73","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Exploit","Issue Tracking","Patch","Third Party Advisory"],"title":"Multiple crashes when converting png files · Issue #73 · saitoha/libsixel · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://bitbucket.org/netbsd/pkgsrc/commits/6f0c011cbfccdffa635d04c84433b1a02687adad","name":"https://bitbucket.org/netbsd/pkgsrc/commits/6f0c011cbfccdffa635d04c84433b1a02687adad","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Broken Link"],"title":"404 — Bitbucket","mime":"text/html","httpstatus":"404","archivestatus":"404"},{"url":"https://github.com/saitoha/libsixel/blob/master/ChangeLog","name":"https://github.com/saitoha/libsixel/blob/master/ChangeLog","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Release Notes","Third Party Advisory"],"title":"libsixel/ChangeLog at master · saitoha/libsixel · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://github.com/saitoha/libsixel/releases/tag/v1.8.4","name":"https://github.com/saitoha/libsixel/releases/tag/v1.8.4","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Release Notes","Third Party Advisory"],"title":"Release v1.8.4 security update · saitoha/libsixel · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://github.com/saitoha/libsixel/commit/cb373ab6614c910407c5e5a93ab935144e62b037","name":"https://github.com/saitoha/libsixel/commit/cb373ab6614c910407c5e5a93ab935144e62b037","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch","Third Party Advisory"],"title":"Avoid illegal memory access problem with 1 color paletted png(#73), · saitoha/libsixel@cb373ab · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-21048","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-21048","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"n/a","product":"n/a","version":"affected n/a","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2020","cve_id":"21048","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"saitoha","cpe5":"libsixel","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2020","cve_id":"21048","cve":"CVE-2020-21048","epss":"0.004120000","percentile":"0.615010000","score_date":"2026-04-26","updated_at":"2026-04-27 00:09:42"},"legacy_qids":[{"cve":"CVE-2020-21048","qid":"180773","title":"Debian Security Update for libsixel (CVE-2020-21048)"}]},"source_records":{"cve_program":{"containers":{"adp":[{"providerMetadata":{"dateUpdated":"2024-08-04T14:22:25.546Z","orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE"},"references":[{"tags":["x_refsource_MISC","x_transferred"],"url":"https://github.com/saitoha/libsixel/issues/73"},{"tags":["x_refsource_MISC","x_transferred"],"url":"https://github.com/saitoha/libsixel/commit/cb373ab6614c910407c5e5a93ab935144e62b037"},{"tags":["x_refsource_MISC","x_transferred"],"url":"https://github.com/saitoha/libsixel/releases/tag/v1.8.4"},{"tags":["x_refsource_MISC","x_transferred"],"url":"https://github.com/saitoha/libsixel/blob/master/ChangeLog"},{"tags":["x_refsource_MISC","x_transferred"],"url":"https://bitbucket.org/netbsd/pkgsrc/commits/6f0c011cbfccdffa635d04c84433b1a02687adad"}],"title":"CVE Program Container"}],"cna":{"affected":[{"product":"n/a","vendor":"n/a","versions":[{"status":"affected","version":"n/a"}]}],"descriptions":[{"lang":"en","value":"An issue in the dither.c component of libsixel prior to v1.8.4 allows attackers to cause a denial of service (DOS) via a crafted PNG file."}],"problemTypes":[{"descriptions":[{"description":"n/a","lang":"en","type":"text"}]}],"providerMetadata":{"dateUpdated":"2021-09-14T15:09:26.000Z","orgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","shortName":"mitre"},"references":[{"tags":["x_refsource_MISC"],"url":"https://github.com/saitoha/libsixel/issues/73"},{"tags":["x_refsource_MISC"],"url":"https://github.com/saitoha/libsixel/commit/cb373ab6614c910407c5e5a93ab935144e62b037"},{"tags":["x_refsource_MISC"],"url":"https://github.com/saitoha/libsixel/releases/tag/v1.8.4"},{"tags":["x_refsource_MISC"],"url":"https://github.com/saitoha/libsixel/blob/master/ChangeLog"},{"tags":["x_refsource_MISC"],"url":"https://bitbucket.org/netbsd/pkgsrc/commits/6f0c011cbfccdffa635d04c84433b1a02687adad"}],"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"cve@mitre.org","ID":"CVE-2020-21048","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"n/a","version":{"version_data":[{"version_value":"n/a"}]}}]},"vendor_name":"n/a"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"An issue in the dither.c component of libsixel prior to v1.8.4 allows attackers to cause a denial of service (DOS) via a crafted PNG file."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"n/a"}]}]},"references":{"reference_data":[{"name":"https://github.com/saitoha/libsixel/issues/73","refsource":"MISC","url":"https://github.com/saitoha/libsixel/issues/73"},{"name":"https://github.com/saitoha/libsixel/commit/cb373ab6614c910407c5e5a93ab935144e62b037","refsource":"MISC","url":"https://github.com/saitoha/libsixel/commit/cb373ab6614c910407c5e5a93ab935144e62b037"},{"name":"https://github.com/saitoha/libsixel/releases/tag/v1.8.4","refsource":"MISC","url":"https://github.com/saitoha/libsixel/releases/tag/v1.8.4"},{"name":"https://github.com/saitoha/libsixel/blob/master/ChangeLog","refsource":"MISC","url":"https://github.com/saitoha/libsixel/blob/master/ChangeLog"},{"name":"https://bitbucket.org/netbsd/pkgsrc/commits/6f0c011cbfccdffa635d04c84433b1a02687adad","refsource":"MISC","url":"https://bitbucket.org/netbsd/pkgsrc/commits/6f0c011cbfccdffa635d04c84433b1a02687adad"}]}}}},"cveMetadata":{"assignerOrgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","assignerShortName":"mitre","cveId":"CVE-2020-21048","datePublished":"2021-09-14T15:09:26.000Z","dateReserved":"2020-08-13T00:00:00.000Z","dateUpdated":"2024-08-04T14:22:25.546Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.1"},"nvd":{"publishedDate":"2021-09-14 16:15:08","lastModifiedDate":"2026-04-24 12:56:58","problem_types":["NVD-CWE-noinfo","n/a"],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","baseScore":6.5,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":3.6}],"cvssMetricV2":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"2.0","vectorString":"AV:N/AC:M/Au:N/C:N/I:N/A:P","baseScore":4.3,"accessVector":"NETWORK","accessComplexity":"MEDIUM","authentication":"NONE","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"PARTIAL"},"baseSeverity":"MEDIUM","exploitabilityScore":8.6,"impactScore":2.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":true}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:saitoha:libsixel:*:*:*:*:*:*:*:*","versionEndExcluding":"1.8.4","matchCriteriaId":"41F76DB6-6107-4BFE-882D-1134E1F2CA8F"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2020","CveId":"21048","Ordinal":"1","Title":"CVE-2020-21048","CVE":"CVE-2020-21048","Year":"2020"},"notes":[{"CveYear":"2020","CveId":"21048","Ordinal":"1","NoteData":"An issue in the dither.c component of libsixel prior to v1.8.4 allows attackers to cause a denial of service (DOS) via a crafted PNG file.","Type":"Description","Title":"CVE-2020-21048"},{"CveYear":"2020","CveId":"21048","Ordinal":"2","NoteData":"2021-09-14","Type":"Other","Title":"Published"},{"CveYear":"2020","CveId":"21048","Ordinal":"3","NoteData":"2021-09-14","Type":"Other","Title":"Modified"}]}}}