{"id":"CVE-2021-47970","state":"PUBLISHED","title":"Macaron Notes 5.5 Denial of Service via Buffer Overflow","description":"Macaron Notes 5.5 contains a denial of service vulnerability that allows attackers to crash the application by creating notes with excessively long character strings. Attackers can generate a payload containing 350000 repeated characters and paste it into a note field to trigger application crash and stop functionality.","publishedAt":"2026-05-16T15:26:11.249Z","updatedAt":"2026-07-28T01:47:32.014Z","severity":{"score":8.7,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["Macaron Notes Macaron Notes"],"affected":[{"vendor":"Macaron Notes","product":"Macaron Notes","versions":[{"version":"5.5","status":"affected"}]}],"references":["https://www.exploit-db.com/exploits/49953","https://www.vulncheck.com/advisories/macaron-notes-denial-of-service-via-buffer-overflow"],"weaknesses":["CWE-789"],"ingestedAt":"2026-10-29T19:49:19.404Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/47xxx/CVE-2021-47970.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47970","state":"PUBLISHED","datePublished":"2026-05-16T15:26:11.249Z","dateUpdated":"2026-07-28T01:47:32.014Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-05-16T14:30:32.190Z"},"containers":{"cna":{"title":"Macaron Notes 5.5 Denial of Service via Buffer Overflow","descriptions":[{"lang":"en","value":"Macaron Notes 5.5 contains a denial of service vulnerability that allows attackers to crash the application by creating notes with excessively long character strings. Attackers can generate a payload containing 350000 repeated characters and paste it into a note field to trigger application crash and stop functionality."}],"affected":[{"vendor":"Macaron Notes","product":"Macaron Notes","versions":[{"version":"5.5","status":"affected"}]}],"references":[{"url":"https://www.exploit-db.com/exploits/49953","name":"ExploitDB-49953","tags":["exploit"]},{"url":"https://www.vulncheck.com/advisories/macaron-notes-denial-of-service-via-buffer-overflow","name":"VulnCheck Advisory: Macaron Notes 5.5 Denial of Service via Buffer Overflow","tags":["third-party-advisory"]}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS"},{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"format":"CVSS"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-789","lang":"en","description":"Memory Allocation with Excessive Size Value","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-07-28T01:47:32.014Z"},"datePublic":"2021-04-06T00:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:go-macaron:macaron:5.5:*:*:*:*:*:*:*"}]}]}],"credits":[{"lang":"en","value":"Geovanni Ruiz","type":"finder"}],"x_generator":{"engine":"vulncheck"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-18T16:58:05.332485Z","id":"CVE-2021-47970","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-18T16:58:21.238Z"}}]}}}