{"id":"CVE-2023-28320","url":"https://www.cyber-defence.io/tools/cve/CVE-2023-28320","generatedAt":"2026-10-28T02:10:25.269Z","title":"A denial of service vulnerability exists in curl <v8.1.0 in the way libcurl provides several different backends for resolving host names, selected at build time.","description":"A denial of service vulnerability exists in curl <v8.1.0 in the way libcurl provides several different backends for resolving host names, selected at build time. If it is built to use the synchronous resolver, it allows name resolves to time-out slow operations using `alarm()` and `siglongjmp()`. When doing this, libcurl used a global buffer that was not mutex protected and a multi-threaded application might therefore crash or otherwise misbehave.","published":"2023-05-26T21:15:16.000Z","lastModified":"2026-10-23T23:10:00.000Z","status":"Modified","sourceIdentifier":"support@hackerone.com","cvss":{"version":"3.1","score":5.9,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-400","CWE-362"],"affected":["haxx/curl","apple/macos","netapp/clustered data ontap","netapp/ontap antivirus connector","netapp/h300s firmware","netapp/h500s firmware","netapp/h700s firmware","netapp/h410s firmware"],"epss":{"score":0.02658,"percentile":0.85575,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (2.66%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"http://seclists.org/fulldisclosure/2023/Jul/47","tags":["Mailing List","Third Party Advisory"],"source":"support@hackerone.com"},{"url":"http://seclists.org/fulldisclosure/2023/Jul/48","tags":["Mailing List","Third Party Advisory"],"source":"support@hackerone.com"},{"url":"http://seclists.org/fulldisclosure/2023/Jul/52","tags":["Mailing List","Third Party Advisory"],"source":"support@hackerone.com"},{"url":"https://hackerone.com/reports/1929597","tags":["Exploit","Patch","Third Party Advisory"],"source":"support@hackerone.com"},{"url":"https://security.gentoo.org/glsa/202310-12","tags":["Third Party Advisory"],"source":"support@hackerone.com"},{"url":"https://security.netapp.com/advisory/ntap-20230609-0009/","tags":["Third Party Advisory"],"source":"support@hackerone.com"},{"url":"https://support.apple.com/kb/HT213843","tags":["Third Party Advisory"],"source":"support@hackerone.com"},{"url":"https://support.apple.com/kb/HT213844","tags":["Third Party Advisory"],"source":"support@hackerone.com"},{"url":"https://support.apple.com/kb/HT213845","tags":["Third Party Advisory"],"source":"support@hackerone.com"},{"url":"http://seclists.org/fulldisclosure/2023/Jul/47","tags":["Mailing List","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://seclists.org/fulldisclosure/2023/Jul/48","tags":["Mailing List","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://seclists.org/fulldisclosure/2023/Jul/52","tags":["Mailing List","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://hackerone.com/reports/1929597","tags":["Exploit","Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/202310-12","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20230609-0009/","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://support.apple.com/kb/HT213843","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://support.apple.com/kb/HT213844","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://support.apple.com/kb/HT213845","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-28320","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}