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overflow in ultra.c in LibVNCClient in LibVNCServer before 0.9.11 allows remote servers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted FramebufferUpdate message with the Ultra type tile, such that the LZO payload decompressed length exceeds what is specified by the tile dimensions.","status":"published","published":"2016-12-31T00:00:00Z","modified":"2026-04-22T11:08:00.516662Z","cvss":[{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:54:13.356796Z"},{"id":"DLA-1979-1","title":"italc - security update","status":"published","published":"2019-10-30T00:00:00Z","modified":"2026-03-09T01:18:20.937176Z","updated_at":"2026-11-02T15:46:10.227108Z"},{"id":"DLA-777-1","title":"libvncserver - security update","status":"published","published":"2017-01-03T00:00:00Z","modified":"2026-03-09T02:10:36.646329Z","updated_at":"2026-11-02T15:46:13.207219Z"},{"id":"DSA-3753-1","title":"libvncserver - security update","status":"published","published":"2017-01-05T00:00:00Z","modified":"2026-03-09T01:21:35.556946Z","updated_at":"2026-11-02T15:46:16.523846Z"},{"id":"MGASA-2017-0027","title":"Updated libvncserver packages fix security vulnerability","description":"It was discovered that there were two vulnerabilities in libvncserver, a\nlibrary to create/embed a VNC server:\n\nA heap-based buffer overflow that allows remote servers to cause a\ndenial of service via a crafted FramebufferUpdate message containing a\nsubrectangle outside of the drawing area (CVE-2016-9941).\n\nA heap-based buffer overflow that allow remote servers to cause a denial\nof service via a crafted FramebufferUpdate message with the \"Ultra\" type\ntile such that the LZO decompressed payload exceeds the size of the tile\ndimensions (CVE-2016-9942).\n","status":"published","published":"2017-01-27T20:30:52Z","modified":"2026-04-16T06:22:55.319020818Z","updated_at":"2026-11-02T15:49:40.103088Z"},{"id":"SUSE-SU-2017:0104-1","title":"Security update for LibVNCServer","description":"\nLibVNCServer was updated to fix two security issues.\n\nThese security issues were fixed:\n\n- CVE-2016-9941: Heap-based buffer overflow in rfbproto.c allowed remote servers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted FramebufferUpdate message containing a subrectangle outside of the client drawing area (bsc#1017711)\n- CVE-2016-9942: Heap-based buffer overflow in ultra.c allowed remote servers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted FramebufferUpdate message with the Ultra type tile, such that the LZO payload decompressed length exceeds what is specified by the tile dimensions (bsc#1017712)\n","status":"published","published":"2017-01-11T09:26:50Z","modified":"2026-02-04T03:36:18.748632Z","updated_at":"2026-11-02T15:53:43.83457Z"},{"id":"SUSE-SU-2017:0519-1","title":"Security update for tigervnc","description":"\nThis update for tigervnc provides the following fixes:\n\n- Prevent malicious server from crashing a server via a buffer overflow, a similar flaw as the LibVNCServer issues CVE-2016-9941 and CVE-2016-9942.. (bsc#1019274)\n- CVE-2016-10207: Prevent potential crash due to insufficient clean-up after failure to establish TLS\n  connection. (bsc#1023012)\n","status":"published","published":"2017-02-20T10:05:40Z","modified":"2026-02-04T02:18:21.724304Z","updated_at":"2026-11-02T15:53:43.83457Z"},{"id":"SUSE-SU-2017:0622-1","title":"Security update for tigervnc","description":"\nThis update for tigervnc provides the following fixes:\n\n- Prevent malicious server from crashing a server via a buffer overflow, a similar flaw as the LibVNCServer issues CVE-2016-9941 and CVE-2016-9942. (bsc#1019274)\n- CVE-2016-10207: Prevent potential crash due to insufficient clean-up after failure to establish TLS\n  connection. (bsc#1023012)\n","status":"published","published":"2017-03-07T12:58:53Z","modified":"2026-02-04T04:07:21.606617Z","updated_at":"2026-11-02T15:53:43.83457Z"},{"id":"SUSE-SU-2018:0830-1","title":"Security update for LibVNCServer","description":"\nLibVNCServer was updated to fix two security issues.\n\nThese security issues were fixed:\n\n- CVE-2018-7225: Missing input sanitization inside rfbserver.c rfbProcessClientNormalMessage() (bsc#1081493).\n- CVE-2016-9942: Heap-based buffer overflow in ultra.c allowed remote servers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted FramebufferUpdate message with the Ultra type tile, such that the LZO payload decompressed length exceeds what is specified by the tile dimensions (bsc#1017712).\n- CVE-2016-9941: Heap-based buffer overflow in rfbproto.c allowed remote servers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted FramebufferUpdate message containing a subrectangle outside of the client drawing area (bsc#1017711).\n  ","status":"published","published":"2018-03-27T14:28:22Z","modified":"2026-02-04T04:32:15.552418Z","updated_at":"2026-11-02T15:53:44.594517Z"},{"id":"USN-3171-1","title":"libvncserver vulnerabilities","description":"Josef Gajdusek discovered that the LibVNCServer client library incorrectly\nhandled certain FrameBufferUpdate messages.  If a user were tricked into\nconnecting to a malicious server, an attacker could use this issue to cause\na denial of service, or possibly execute arbitrary code. (CVE-2016-9941,\nCVE-2016-9942)\n","status":"published","published":"2017-01-11T18:09:31Z","modified":"2026-04-22T09:30:33.012113Z","updated_at":"2026-11-02T16:58:10.303275Z"},{"id":"USN-4587-1","title":"italc vulnerabilities","description":"Nicolas Ruff discovered that iTALC had buffer overflows, divide-by-zero errors\nand didn't check malloc return values. A remote attacker could use these issues\nto cause a denial of service or possibly execute arbitrary code.\n(CVE-2014-6051, CVE-2014-6052, CVE-2014-6053, CVE-2014-6054, CVE-2014-6055)\n\nJosef Gajdusek discovered that iTALC had heap-based buffer overflow\nvulnerabilities. A remote attacker could used these issues to cause a denial of\nservice or possibly execute arbitrary code. (CVE-2016-9941, CVE-2016-9942)\n\nIt was discovered that iTALC had an out-of-bounds write, multiple heap\nout-of-bounds writes, an infinite loop, improper initializations, and null\npointer vulnerabilities. A remote attacker could used these issues to cause a\ndenial of service or possibly execute arbitrary code. (CVE-2018-15127,\nCVE-2018-20019, CVE-2018-20020, CVE-2018-20021, CVE-2018-20022, CVE-2018-20023,\nCVE-2018-20024, CVE-2018-20748, CVE-2018-20749, CVE-2018-20750, CVE-2018-7225,\nCVE-2019-15681)\n","status":"published","published":"2020-10-20T16:35:20Z","modified":"2026-04-27T15:48:42.890842055Z","updated_at":"2026-11-02T16:58:15.159055Z"}]}}