{"id":"CVE-2015-6525","aliases":["DEBIAN-CVE-2015-6525","DSA-3119-1","EUVD-2015-6464","GHSA-xfhg-qx7p-6gx5","UBUNTU-CVE-2015-6525"],"status":"published","title":"Multiple integer overflows in the evbuffer API in Libevent 2.0.x before 2.0.22 and 2.1.x before 2...","description":"Multiple integer overflows in the evbuffer API in Libevent 2.0.x before 2.0.22 and 2.1.x before 2.1.5-beta allow context-dependent attackers to cause a denial of service or possibly have other unspecified impact via \"insanely large inputs\" to the (1) evbuffer_add, (2) evbuffer_prepend, (3) evbuffer_expand, (4) exbuffer_reserve_space, or (5) evbuffer_read function, which triggers a heap-based buffer overflow or an infinite loop.  NOTE: this identifier was SPLIT from CVE-2014-6272 per ADT3 due to different affected versions.","severity":{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.04813,"percentile":0.92032,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-189"],"published":"2015-01-06T00:00:00Z","modified":"2026-09-09T06:47:27Z","fixes":[{"ecosystem":"Debian:12","package":"libevent","fixed_in":["2.0.21-stable-2"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"libevent","fixed_in":["2.0.21-stable-2"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"libevent","fixed_in":["2.0.21-stable-2"],"sources":["osv"]},{"ecosystem":"Ubuntu:14.04:LTS","package":"libevent","fixed_in":["2.0.21-stable-1ubuntu1.14.04.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"libevent","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.21-stable-2"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"libevent","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.21-stable-2"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"libevent","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.21-stable-2"}]}]},{"source":"osv","ecosystem":"Debian:7","package":"libevent","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.19-stable-3+deb7u1"}]}],"versions":["2.0.19-stable-3"],"bundled":2},{"source":"osv","ecosystem":"Ubuntu:14.04:LTS","package":"libevent","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.21-stable-1ubuntu1.14.04.1"}]}],"versions":["2.0.21-stable-1","2.0.21-stable-1ubuntu1"]}],"products":[{"vendor":"debian","product":"debian_linux"},{"vendor":"libevent_project","product":"libevent"}],"references":[{"url":"http://archives.seul.org/libevent/users/Jan-2015/msg00010.html","tags":["mailing-list","x_refsource_MLIST","x_transferred","Vendor Advisory","advisory","report"]},{"url":"http://www.debian.org/security/2015/dsa-3119","tags":["vendor-advisory","x_refsource_DEBIAN","x_transferred","advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2015-6525"},{"url":"https://github.com/advisories/GHSA-xfhg-qx7p-6gx5"},{"url":"https://security-tracker.debian.org/tracker/CVE-2015-6525","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2015-6525","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-2477-1","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2015-6525","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2015-6525","description":"Multiple integer overflows in the evbuffer API in Libevent 2.0.x before 2.0.22 and 2.1.x before 2.1.5-beta allow context-dependent attackers to cause a denial of service or possibly have other unspecified impact via \"insanely large inputs\" to the (1) evbuffer_add, (2) evbuffer_prepend, (3) evbuffer_expand, (4) exbuffer_reserve_space, or (5) evbuffer_read function, which triggers a heap-based buffer overflow or an infinite loop.  NOTE: this identifier was SPLIT from CVE-2014-6272 per ADT3 due to different affected versions.","status":"published","published":"2015-08-24T14:00:00Z","modified":"2024-08-06T07:22:22.219Z","updated_at":"2026-11-02T14:35:42.680858Z"}],"euvd":[{"id":"EUVD-2015-6464","description":"Multiple integer overflows in the evbuffer API in Libevent 2.0.x before 2.0.22 and 2.1.x before 2.1.5-beta allow context-dependent attackers to cause a denial of service or possibly have other unspecified impact via \"insanely large inputs\" to the (1) evbuffer_add, (2) evbuffer_prepend, (3) evbuffer_expand, (4) exbuffer_reserve_space, or (5) evbuffer_read function, which triggers a heap-based buffer overflow or an infinite loop.  NOTE: this identifier was SPLIT from CVE-2014-6272 per ADT3 due to different affected versions.","status":"published","published":"2015-08-24T14:00:00Z","modified":"2024-08-06T07:22:22Z","updated_at":"2026-11-03T02:21:55.706543Z"}],"ghsa":[{"id":"GHSA-xfhg-qx7p-6gx5","title":"Multiple integer overflows in the evbuffer API in Libevent 2.0.x before 2.0.22 and 2.1.x before 2...","description":"Multiple integer overflows in the evbuffer API in Libevent 2.0.x before 2.0.22 and 2.1.x before 2.1.5-beta allow context-dependent attackers to cause a denial of service or possibly have other unspecified impact via \"insanely large inputs\" to the (1) evbuffer_add, (2) evbuffer_prepend, (3) evbuffer_expand, (4) exbuffer_reserve_space, or (5) evbuffer_read function, which triggers a heap-based buffer overflow or an infinite loop.  NOTE: this identifier was SPLIT from CVE-2014-6272 per ADT3 due to different affected versions.","status":"published","published":"2022-05-17T04:09:21Z","modified":"2023-01-28T05:01:16Z","updated_at":"2026-11-02T14:43:31.850485Z"}],"nvd":[{"id":"CVE-2015-6525","description":"Multiple integer overflows in the evbuffer API in Libevent 2.0.x before 2.0.22 and 2.1.x before 2.1.5-beta allow context-dependent attackers to cause a denial of service or possibly have other unspecified impact via \"insanely large inputs\" to the (1) evbuffer_add, (2) evbuffer_prepend, (3) evbuffer_expand, (4) exbuffer_reserve_space, or (5) evbuffer_read function, which triggers a heap-based buffer overflow or an infinite loop.  NOTE: this identifier was SPLIT from CVE-2014-6272 per ADT3 due to different affected versions.","status":"published","published":"2015-08-24T14:59:14.133Z","modified":"2026-06-17T00:31:00.843Z","cvss":[{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-189"],"updated_at":"2026-11-02T14:03:08.998581Z"}],"osv":[{"id":"CVE-2015-6525","description":"Multiple integer overflows in the evbuffer API in Libevent 2.0.x before 2.0.22 and 2.1.x before 2.1.5-beta allow context-dependent attackers to cause a denial of service or possibly have other unspecified impact via \"insanely large inputs\" to the (1) evbuffer_add, (2) evbuffer_prepend, (3) evbuffer_expand, (4) exbuffer_reserve_space, or (5) evbuffer_read function, which triggers a heap-based buffer overflow or an infinite loop.  NOTE: this identifier was SPLIT from CVE-2014-6272 per ADT3 due to different affected versions.","status":"published","published":"2015-08-24T14:59:14Z","modified":"2026-04-10T03:45:24.289493Z","updated_at":"2026-11-02T15:44:00.594921Z"},{"id":"DEBIAN-CVE-2015-6525","description":"Multiple integer overflows in the evbuffer API in Libevent 2.0.x before 2.0.22 and 2.1.x before 2.1.5-beta allow context-dependent attackers to cause a denial of service or possibly have other unspecified impact via \"insanely large inputs\" to the (1) evbuffer_add, (2) evbuffer_prepend, (3) evbuffer_expand, (4) exbuffer_reserve_space, or (5) evbuffer_read function, which triggers a heap-based buffer overflow or an infinite loop.  NOTE: this identifier was SPLIT from CVE-2014-6272 per ADT3 due to different affected versions.","status":"published","published":"2015-08-24T14:59:14.133Z","modified":"2026-09-09T06:47:27.096910728Z","updated_at":"2026-11-02T15:45:27.04239Z"},{"id":"DSA-3119-1","title":"libevent - security update","status":"published","published":"2015-01-06T00:00:00Z","modified":"2026-03-09T01:18:33.794477Z","updated_at":"2026-11-02T15:46:15.843838Z"},{"id":"UBUNTU-CVE-2015-6525","description":"Multiple integer overflows in the evbuffer API in Libevent 2.0.x before 2.0.22 and 2.1.x before 2.1.5-beta allow context-dependent attackers to cause a denial of service or possibly have other unspecified impact via \"insanely large inputs\" to the (1) evbuffer_add, (2) evbuffer_prepend, (3) evbuffer_expand, (4) exbuffer_reserve_space, or (5) evbuffer_read function, which triggers a heap-based buffer overflow or an infinite loop.  NOTE: this identifier was SPLIT from CVE-2014-6272 per ADT3 due to different affected versions.","status":"published","published":"2015-08-24T14:59:00Z","modified":"2026-04-22T10:16:30.758397Z","updated_at":"2026-11-02T15:54:10.385269Z"}]}}