{"id":"CVE-2023-37544","url":"https://www.cyber-defence.io/tools/cve/CVE-2023-37544","generatedAt":"2026-10-27T23:56:27.036Z","title":"Improper Authentication vulnerability in Apache Pulsar WebSocket Proxy allows an attacker to connect to the /pingpong endpoint without authentication.","description":"Improper Authentication vulnerability in Apache Pulsar WebSocket Proxy allows an attacker to connect to the /pingpong endpoint without authentication.\n\nThis issue affects Apache Pulsar WebSocket Proxy: from 2.8.0 through 2.8.*, from 2.9.0 through 2.9.*, from 2.10.0 through 2.10.4, from 2.11.0 through 2.11.1, 3.0.0.\n\nThe known risks include a denial of service due to the WebSocket Proxy accepting any connections, and excessive data transfer due to misuse of the WebSocket ping/pong feature.\n\n2.10 Pulsar WebSocket Proxy users should upgrade to at least 2.10.5.\n2.11 Pulsar WebSocket Proxy users should upgrade to at least 2.11.2.\n3.0 Pulsar WebSocket Proxy users should upgrade to at least 3.0.1.\n3.1 Pulsar WebSocket Proxy users are unaffected.\nAny users running the Pulsar WebSocket Proxy for 2.8, 2.9, and earlier should upgrade to one of the above patched versions.","published":"2023-12-20T09:15:07.000Z","lastModified":"2026-06-17T06:08:25.000Z","status":"Modified","sourceIdentifier":"security@apache.org","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-287"],"affected":["apache/pulsar"],"epss":{"score":0.01351,"percentile":0.71314,"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":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (1.35%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"http://www.openwall.com/lists/oss-security/2023/12/20/2","tags":["Mailing List"],"source":"security@apache.org"},{"url":"https://lists.apache.org/thread/od0k9zts1toc9h9snbqq4pjpyx28mv4m","tags":["Mailing List"],"source":"security@apache.org"},{"url":"http://www.openwall.com/lists/oss-security/2023/12/20/2","tags":["Mailing List"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.apache.org/thread/od0k9zts1toc9h9snbqq4pjpyx28mv4m","tags":["Mailing List"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-37544","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."}