{"id":"CVE-2023-5632","state":"PUBLISHED","title":"Unconditionally adding an event to the epoll causes excessive CPU consumption","description":"In Eclipse Mosquito before and including 2.0.5, establishing a connection to the mosquitto server without sending data causes the EPOLLOUT event to be added, which results excessive CPU consumption. This could be used by a malicious actor to perform denial of service type attack. This issue is fixed in 2.0.6\n\n\n","publishedAt":"2023-10-18T08:34:34.788Z","updatedAt":"2024-09-13T14:50:24.704Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"eclipse"},"assigner":"eclipse","products":["Eclipse Mosquitto"],"affected":[{"vendor":"Eclipse","product":"Mosquitto","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"2.0.5","versionType":"custom"}],"programFiles":["https://github.com/eclipse/mosquitto/blob/master/lib/packet_mosq.c"],"repo":"https://github.com/eclipse/mosquitto"}],"references":["https://github.com/eclipse/mosquitto/pull/2053","https://github.com/eclipse/mosquitto/commit/18bad1ff32435e523d7507e9b2ce0010124a8f2d"],"weaknesses":["CWE-834"],"ingestedAt":"2026-10-29T20:06:42.242Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/5xxx/CVE-2023-5632.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2023-5632","state":"PUBLISHED","datePublished":"2023-10-18T08:34:34.788Z","dateUpdated":"2024-09-13T14:50:24.704Z","assignerShortName":"eclipse","assignerOrgId":"e51fbebd-6053-4e49-959f-1b94eeb69a2c","dateReserved":"2023-10-18T08:17:55.102Z"},"containers":{"cna":{"title":"Unconditionally adding an event to the epoll causes excessive CPU consumption","descriptions":[{"lang":"en","value":"In Eclipse Mosquito before and including 2.0.5, establishing a connection to the mosquitto server without sending data causes the EPOLLOUT event to be added, which results excessive CPU consumption. This could be used by a malicious actor to perform denial of service type attack. This issue is fixed in 2.0.6\n\n\n"}],"affected":[{"vendor":"Eclipse","product":"Mosquitto","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"2.0.5","versionType":"custom"}],"programFiles":["https://github.com/eclipse/mosquitto/blob/master/lib/packet_mosq.c"],"repo":"https://github.com/eclipse/mosquitto"}],"references":[{"url":"https://github.com/eclipse/mosquitto/pull/2053","tags":["patch","issue-tracking"]},{"url":"https://github.com/eclipse/mosquitto/commit/18bad1ff32435e523d7507e9b2ce0010124a8f2d","tags":["patch"]}],"metrics":[{"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","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-834","description":"CWE-834 Excessive Iteration","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"eclipse","orgId":"e51fbebd-6053-4e49-959f-1b94eeb69a2c","dateUpdated":"2023-10-18T08:34:34.788Z"},"credits":[{"lang":"en","type":"finder","user":"00000000-0000-4000-9000-000000000000","value":"Przemysław Zygmunt (acsoftware.pl)"}],"impacts":[{"capecId":"CAPEC-130","descriptions":[{"lang":"en","value":"CAPEC-130 Excessive Allocation"}]}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 0.1.0-dev"}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://github.com/eclipse/mosquitto/pull/2053","tags":["patch","issue-tracking","x_transferred"]},{"url":"https://github.com/eclipse/mosquitto/commit/18bad1ff32435e523d7507e9b2ce0010124a8f2d","tags":["patch","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-02T08:07:32.289Z"}},{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2024-09-13T14:50:16.055664Z","id":"CVE-2023-5632","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-09-13T14:50:24.704Z"}}]}}}