{"id":"CVE-2015-4054","url":"https://www.cyber-defence.io/tools/cve/CVE-2015-4054","generatedAt":"2026-10-27T20:53:02.616Z","title":"PgBouncer before 1.5.5 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) by sending a password packet before a startup packet.","description":"PgBouncer before 1.5.5 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) by sending a password packet before a startup packet.","published":"2017-05-23T04:29:00.000Z","lastModified":"2026-06-17T00:26:42.000Z","status":"Modified","sourceIdentifier":"security@debian.org","cvss":{"version":"3.0","score":7.5,"severity":"HIGH","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-476"],"affected":["pgbouncer/pgbouncer"],"epss":{"score":0.0413,"percentile":0.90755,"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 (4.13%). 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/2015/05/22/5","tags":["Mailing List","Third Party Advisory"],"source":"security@debian.org"},{"url":"http://www.securityfocus.com/bid/74751","tags":["Third Party Advisory","VDB Entry"],"source":"security@debian.org"},{"url":"https://github.com/pgbouncer/pgbouncer/commit/74d6e5f7de5ec736f71204b7b422af7380c19ac5","tags":["Patch","Third Party Advisory"],"source":"security@debian.org"},{"url":"https://github.com/pgbouncer/pgbouncer/commit/edab5be6665b9e8de66c25ba527509b229468573","tags":["Patch","Third Party Advisory"],"source":"security@debian.org"},{"url":"https://github.com/pgbouncer/pgbouncer/issues/42","tags":["Exploit","Third Party Advisory"],"source":"security@debian.org"},{"url":"https://pgbouncer.github.io/changelog.html#pgbouncer-15x","tags":["Release Notes","Third Party Advisory"],"source":"security@debian.org"},{"url":"https://security.gentoo.org/glsa/201701-24","tags":["Third Party Advisory"],"source":"security@debian.org"},{"url":"http://www.openwall.com/lists/oss-security/2015/05/22/5","tags":["Mailing List","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/bid/74751","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/pgbouncer/pgbouncer/commit/74d6e5f7de5ec736f71204b7b422af7380c19ac5","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/pgbouncer/pgbouncer/commit/edab5be6665b9e8de66c25ba527509b229468573","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/pgbouncer/pgbouncer/issues/42","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://pgbouncer.github.io/changelog.html#pgbouncer-15x","tags":["Release Notes","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/201701-24","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2015-4054","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."}