{"id":"CVE-2016-0787","aliases":["ALPINE-CVE-2016-0787","DEBIAN-CVE-2016-0787","DLA-426-1","DSA-3487-1","EUVD-2016-0800","GHSA-6wmj-27wm-wwx6","MGASA-2016-0392","RHSA-2016:0428","SUSE-SU-2016:0718-1","SUSE-SU-2016:0723-1","SUSE-SU-2017:2699-1","SUSE-SU-2017:2700-1","UBUNTU-CVE-2016-0787","openSUSE-SU-2024:10190-1"],"status":"published","title":"The diffie_hellman_sha256 function in kex.c in libssh2 before 1.7.0 improperly truncates secrets...","description":"The diffie_hellman_sha256 function in kex.c in libssh2 before 1.7.0 improperly truncates secrets to 128 or 256 bits, which makes it easier for man-in-the-middle attackers to decrypt or intercept SSH sessions via unspecified vectors, aka a \"bits/bytes confusion bug.\"","severity":{"version":"3.0","score":5.9,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.02591,"percentile":0.85407,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-200"],"published":"2016-02-23T00:00:00Z","modified":"2026-10-24T10:30:25Z","fixes":[{"ecosystem":"Alpine:v3.4","package":"libssh2","fixed_in":["1.7.0-r0"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"libssh2","fixed_in":["1.5.0-2.1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"libssh2","fixed_in":["1.5.0-2.1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"libssh2","fixed_in":["1.5.0-2.1"],"sources":["osv"]},{"ecosystem":"Debian:6.0","package":"libssh2","fixed_in":["1.2.6-1+deb6u2"],"sources":["osv"]},{"ecosystem":"Debian:7","package":"libssh2","fixed_in":["1.4.2-1.1+deb7u2"],"sources":["osv"]},{"ecosystem":"Debian:8","package":"libssh2","fixed_in":["1.4.3-4.1+deb8u1"],"sources":["osv"]},{"ecosystem":"Mageia:5","package":"libssh2","fixed_in":["1.4.3-6.1.mga5"],"sources":["osv"]},{"ecosystem":"Red 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diffie_hellman_sha256 function in kex.c in libssh2 before 1.7.0 improperly truncates secrets to 128 or 256 bits, which makes it easier for man-in-the-middle attackers to decrypt or intercept SSH sessions via unspecified vectors, aka a \"bits/bytes confusion bug.\"","status":"published","published":"2016-04-13T17:00:00Z","modified":"2024-08-05T22:30:04.675Z","updated_at":"2026-11-02T14:33:37.12286Z"}],"euvd":[{"id":"EUVD-2016-0800","description":"The diffie_hellman_sha256 function in kex.c in libssh2 before 1.7.0 improperly truncates secrets to 128 or 256 bits, which makes it easier for man-in-the-middle attackers to decrypt or intercept SSH sessions via unspecified vectors, aka a \"bits/bytes confusion bug.\"","status":"published","published":"2016-04-13T17:00:00Z","modified":"2024-08-05T22:30:04Z","updated_at":"2026-11-03T02:23:00.426765Z"}],"ghsa":[{"id":"GHSA-6wmj-27wm-wwx6","title":"The diffie_hellman_sha256 function in kex.c in libssh2 before 1.7.0 improperly truncates secrets...","description":"The diffie_hellman_sha256 function in kex.c in libssh2 before 1.7.0 improperly truncates secrets to 128 or 256 bits, which makes it easier for man-in-the-middle attackers to decrypt or intercept SSH sessions via unspecified vectors, aka a \"bits/bytes confusion bug.\"","status":"published","published":"2022-05-14T02:08:04Z","modified":"2023-02-02T05:05:31Z","cvss":[{"version":"3.0","score":5.9,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T14:52:07.660157Z"}],"nvd":[{"id":"CVE-2016-0787","description":"The diffie_hellman_sha256 function in kex.c in libssh2 before 1.7.0 improperly truncates secrets to 128 or 256 bits, which makes it easier for man-in-the-middle attackers to decrypt or intercept SSH sessions via unspecified vectors, aka a \"bits/bytes confusion bug.\"","status":"published","published":"2016-04-13T17:59:10.93Z","modified":"2026-06-17T00:38:13.797Z","cvss":[{"version":"3.0","score":5.9,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T14:03:23.795791Z"}],"osv":[{"id":"ALPINE-CVE-2016-0787","description":"The diffie_hellman_sha256 function in kex.c in libssh2 before 1.7.0 improperly truncates secrets to 128 or 256 bits, which makes it easier for man-in-the-middle attackers to decrypt or intercept SSH sessions via unspecified vectors, aka a \"bits/bytes confusion bug.\"","status":"published","published":"2016-04-13T17:59:10.93Z","modified":"2026-09-22T06:30:06.983541623Z","cvss":[{"version":"3.0","score":5.9,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:27:46.318571Z"},{"id":"CVE-2016-0787","description":"The diffie_hellman_sha256 function in kex.c in libssh2 before 1.7.0 improperly truncates secrets to 128 or 256 bits, which makes it easier for man-in-the-middle attackers to decrypt or intercept SSH sessions via unspecified vectors, aka a \"bits/bytes confusion bug.\"","status":"published","published":"2016-04-13T17:59:10.93Z","modified":"2026-10-24T10:30:25.21568321Z","cvss":[{"version":"3.0","score":5.9,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:01.531338Z"},{"id":"DEBIAN-CVE-2016-0787","description":"The diffie_hellman_sha256 function in kex.c in libssh2 before 1.7.0 improperly truncates secrets to 128 or 256 bits, which makes it easier for man-in-the-middle attackers to decrypt or intercept SSH sessions via unspecified vectors, aka a \"bits/bytes confusion bug.\"","status":"published","published":"2016-04-13T17:59:10.93Z","modified":"2026-09-22T07:00:07.097468098Z","cvss":[{"version":"3.0","score":5.9,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:27.323751Z"},{"id":"UBUNTU-CVE-2016-0787","description":"The diffie_hellman_sha256 function in kex.c in libssh2 before 1.7.0 improperly truncates secrets to 128 or 256 bits, which makes it easier for man-in-the-middle attackers to decrypt or intercept SSH sessions via unspecified vectors, aka a \"bits/bytes confusion bug.\"","status":"published","published":"2016-04-13T17:59:00Z","modified":"2026-04-22T10:27:43.91463Z","cvss":[{"version":"3.0","score":5.9,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:54:11.100633Z"},{"id":"DLA-426-1","title":"libssh2 - security update","status":"published","published":"2016-02-23T00:00:00Z","modified":"2026-03-09T02:10:45.993805Z","updated_at":"2026-11-02T15:46:12.7027Z"},{"id":"DSA-3487-1","title":"libssh2 - security update","status":"published","published":"2016-02-23T00:00:00Z","modified":"2026-03-09T01:19:15.274583Z","updated_at":"2026-11-02T15:46:16.199525Z"},{"id":"MGASA-2016-0392","title":"Updated libssh2 packages fix security vulnerability","description":"Andreas Schneider reported that libssh2 passes the number of bytes to a\nfunction that expects number of bits during the SSHv2 handshake when\nlibssh2 is to get a suitable value for 'group order' in the Diffie-Hellman\nnegotiation. This weakens significantly the handshake security,\npotentially allowing an eavesdropper with enough resources to decrypt or\nintercept SSH sessions (CVE-2016-0787).\n","status":"published","published":"2016-11-21T22:18:01Z","modified":"2026-04-16T06:24:50.643311946Z","updated_at":"2026-11-02T15:49:40.103088Z"},{"id":"openSUSE-SU-2024:10190-1","title":"libssh2-1-1.7.0-1.5 on GA media","description":"These are all security issues fixed in the libssh2-1-1.7.0-1.5 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T03:54:27.610194Z","updated_at":"2026-11-02T16:58:33.135986Z"},{"id":"RHSA-2016:0428","title":"Red Hat Security Advisory: libssh2 security update","status":"published","published":"2024-09-15T23:13:02Z","modified":"2026-06-26T10:30:01Z","updated_at":"2026-11-02T15:53:03.734507Z"},{"id":"SUSE-SU-2016:0718-1","title":"Security update for libssh2_org","description":"\nThis update for libssh2_org fixes the following issues: \n\nSecurity issue fixed:\n- CVE-2016-0787 (bsc#967026):\n  Weakness in diffie-hellman secret key generation lead to much shorter DH groups\n  then needed, which could be used to retrieve server keys.\n\nA feature was added:\n- Support of SHA256 digests for DH group exchanges was added (fate#320343, bsc#961964)\n\nBug fixed:\n- Properly detect EVP_aes_128_ctr at configure time (bsc#933336)\n","status":"published","published":"2016-03-11T09:18:12Z","modified":"2026-02-04T03:15:08.414007Z","updated_at":"2026-11-02T15:53:43.030986Z"},{"id":"SUSE-SU-2016:0723-1","title":"Security update for libssh2_org","description":"\nThis update for libssh2_org fixes the following issues: \n\n- Add SHA256 support for DH group exchange (fate#320343, bsc#961964)\n\n- fix CVE-2016-0787 (bsc#967026)\n  * Weakness in diffie-hellman secret key generation lead to much shorter DH groups\n    then needed, which could be used to retrieve server keys.\n","status":"published","published":"2016-03-11T10:18:54Z","modified":"2026-02-04T03:24:55.351573Z","updated_at":"2026-11-02T15:53:43.030986Z"},{"id":"SUSE-SU-2017:2699-1","title":"Security update for SLES 12 Docker image","description":"The SUSE Linux Enterprise Server 12 container image has been updated to include\nsecurity and stability fixes.\n\nThe following issues related to building of the container images have been fixed:\n\n- Included krb5 package to avoid the inclusion of krb5-mini which gets selected as a\n  dependency by the Build Service solver. (bsc#1056193)\n- Do not install recommended packages when building container images. (bsc#975726)\n\nA number of security issues that have been already fixed by updates released for\nSUSE Linux Enterprise Server 12 are now included in the base image. A package/CVE\ncross-reference is available below.\n\npam:\n\n- CVE-2015-3238\n\nlibtasn1:\n\n- CVE-2015-3622\n- CVE-2016-4008\n\nlibidn:\n\n- CVE-2015-2059\n- CVE-2015-8948\n- CVE-2016-6261\n- CVE-2016-6262\n- CVE-2016-6263\n\nzlib:\n\n- CVE-2016-9840\n- CVE-2016-9841\n- CVE-2016-9842\n- CVE-2016-9843\n\ncurl:\n\n- CVE-2016-5419\n- CVE-2016-5420\n- CVE-2016-5421\n- CVE-2016-7141\n- CVE-2016-7167\n- CVE-2016-8615\n- CVE-2016-8616\n- CVE-2016-8617\n- CVE-2016-8618\n- CVE-2016-8619\n- CVE-2016-8620\n- CVE-2016-8621\n- CVE-2016-8622\n- CVE-2016-8623\n- CVE-2016-8624\n- CVE-2016-9586\n- CVE-2017-1000100\n- CVE-2017-1000101\n- CVE-2017-7407\n\nopenssl:\n\n- CVE-2016-2105\n- CVE-2016-2106\n- CVE-2016-2107\n- CVE-2016-2108\n- CVE-2016-2109\n- CVE-2016-2177\n- CVE-2016-2178\n- CVE-2016-2179\n- CVE-2016-2180\n- CVE-2016-2181\n- CVE-2016-2182\n- CVE-2016-2183\n- CVE-2016-6302\n- CVE-2016-6303\n- CVE-2016-6304\n- CVE-2016-6306\n\nlibxml2:\n\n- CVE-2014-0191\n- CVE-2015-8806\n- CVE-2016-1762\n- CVE-2016-1833\n- CVE-2016-1834\n- CVE-2016-1835\n- CVE-2016-1837\n- CVE-2016-1838\n- CVE-2016-1839\n- CVE-2016-1840\n- CVE-2016-2073\n- CVE-2016-3627\n- CVE-2016-3705\n- CVE-2016-4447\n- CVE-2016-4448\n- CVE-2016-4449\n- CVE-2016-4483\n- CVE-2016-4658\n- CVE-2016-9318\n- CVE-2016-9597\n- CVE-2017-9047\n- CVE-2017-9048\n- CVE-2017-9049\n- CVE-2017-9050\n\nutil-linux:\n\n- CVE-2015-5218\n- CVE-2016-5011\n- CVE-2017-2616\n\ncracklib:\n\n- CVE-2016-6318\n\nsystemd:\n\n- CVE-2014-9770\n- CVE-2015-8842\n- CVE-2016-7796\n\npcre:\n\n- CVE-2014-8964\n- CVE-2015-2325\n- CVE-2015-2327\n- CVE-2015-2328\n- CVE-2015-3210\n- CVE-2015-3217\n- CVE-2015-5073\n- CVE-2015-8380\n- CVE-2015-8381\n- CVE-2015-8382\n- CVE-2015-8383\n- CVE-2015-8384\n- CVE-2015-8385\n- CVE-2015-8386\n- CVE-2015-8387\n- CVE-2015-8388\n- CVE-2015-8389\n- CVE-2015-8390\n- CVE-2015-8391\n- CVE-2015-8392\n- CVE-2015-8393\n- CVE-2015-8394\n- CVE-2015-8395\n- CVE-2016-1283\n- CVE-2016-3191\n\nappamor:\n\n- CVE-2017-6507\n\nbash:\n\n- CVE-2014-6277\n- CVE-2014-6278\n- CVE-2016-0634\n- CVE-2016-7543\n\ncpio:\n\n- CVE-2016-2037\n\nglibc:\n\n- CVE-2016-1234\n- CVE-2016-3075\n- CVE-2016-3706\n- CVE-2016-4429\n- CVE-2017-1000366\n\nperl:\n\n- CVE-2015-8853\n- CVE-2016-1238\n- CVE-2016-2381\n- CVE-2016-6185\n\nlibssh2_org:\n\n- CVE-2016-0787\n\nexpat:\n\n- CVE-2012-6702\n- CVE-2015-1283\n- CVE-2016-0718\n- CVE-2016-5300\n- CVE-2016-9063\n- CVE-2017-9233\n\nncurses:\n\n- CVE-2017-10684\n- CVE-2017-10685\n- CVE-2017-11112\n- CVE-2017-11113\n\nlibksba:\n\n- CVE-2016-4574\n- CVE-2016-4579\n\nlibgcrypt:\n\n- CVE-2015-7511\n- CVE-2016-6313\n- CVE-2017-7526\n\ndbus-1:\n\n- CVE-2014-7824\n- CVE-2015-0245\n\nFinally, the following packages received non-security fixes:\n\n- augeas\n- bzip2\n- ca-certificates-mozilla\n- coreutils\n- cryptsetup\n- cyrus-sasl\n- dirmngr\n- e2fsprogs\n- findutils\n- gpg2\n- insserv-compat\n- kmod\n- libcap\n- libsolv\n- libzypp\n- openldap2\n- p11-kit\n- permissions\n- procps\n- rpm\n- sed\n- shadow\n- zypper\n","status":"published","published":"2017-10-10T19:37:24Z","modified":"2026-02-04T03:24:03.922844Z","updated_at":"2026-11-02T15:53:44.209561Z"},{"id":"SUSE-SU-2017:2700-1","title":"Security update for SLES 12-SP1 Docker image","description":"The SUSE Linux Enterprise Server 12 SP1 container image has been updated to include\nsecurity and stability fixes.\n\nThe following issues related to building of the container images have been fixed:\n\n- Included krb5 package to avoid the inclusion of krb5-mini which gets selected as a\n  dependency by the Build Service solver. (bsc#1056193)\n- Do not install recommended packages when building container images. (bsc#975726)\n\nA number of security issues that have been already fixed by updates released for\nSUSE Linux Enterprise Server 12 SP1 are now included in the base image. A package/CVE\ncross-reference is available below.\n\npam:\n\n- CVE-2015-3238\n\nlibtasn1:\n\n- CVE-2015-3622\n- CVE-2016-4008\n\nexpat:\n\nexpat:\n\n- CVE-2012-6702\n- CVE-2015-1283\n- CVE-2016-0718\n- CVE-2016-5300\n- CVE-2016-9063\n- CVE-2017-9233\n\nlibidn:\n\n- CVE-2015-2059\n- CVE-2015-8948\n- CVE-2016-6261\n- CVE-2016-6262\n- CVE-2016-6263\n\n\nzlib:\n\n- CVE-2016-9840\n- CVE-2016-9841\n- CVE-2016-9842\n- CVE-2016-9843\n\ncurl:\n\n- CVE-2016-5419\n- CVE-2016-5420\n- CVE-2016-5421\n- CVE-2016-7141\n- CVE-2016-7167\n- CVE-2016-8615\n- CVE-2016-8616\n- CVE-2016-8617\n- CVE-2016-8618\n- CVE-2016-8619\n- CVE-2016-8620\n- CVE-2016-8621\n- CVE-2016-8622\n- CVE-2016-8623\n- CVE-2016-8624\n- CVE-2016-9586\n- CVE-2017-1000100\n- CVE-2017-1000101\n- CVE-2017-7407\n\nopenssl:\n\n- CVE-2016-2105\n- CVE-2016-2106\n- CVE-2016-2107\n- CVE-2016-2108\n- CVE-2016-2109\n- CVE-2016-2177\n- CVE-2016-2178\n- CVE-2016-2179\n- CVE-2016-2180\n- CVE-2016-2181\n- CVE-2016-2182\n- CVE-2016-2183\n- CVE-2016-6302\n- CVE-2016-6303\n- CVE-2016-6304\n- CVE-2016-6306\n- CVE-2016-7056\n- CVE-2016-8610\n- CVE-2017-3731\n\ncracklib:\n\n- CVE-2016-6318\n\npcre:\n\n- CVE-2014-8964\n- CVE-2015-2325\n- CVE-2015-2327\n- CVE-2015-2328\n- CVE-2015-3210\n- CVE-2015-3217\n- CVE-2015-5073\n- CVE-2015-8380\n- CVE-2015-8381\n- CVE-2015-8382\n- CVE-2015-8383\n- CVE-2015-8384\n- CVE-2015-8385\n- CVE-2015-8386\n- CVE-2015-8387\n- CVE-2015-8388\n- CVE-2015-8389\n- CVE-2015-8390\n- CVE-2015-8391\n- CVE-2015-8392\n- CVE-2015-8393\n- CVE-2015-8394\n- CVE-2015-8395\n- CVE-2016-1283\n- CVE-2016-3191\n\nappamor:\n\n- CVE-2017-6507\n\nbash:\n\n- CVE-2014-6277\n- CVE-2014-6278\n- CVE-2016-0634\n- CVE-2016-7543\n\ncpio:\n\n- CVE-2016-2037\n\nglibc:\n\n- CVE-2016-1234\n- CVE-2016-3075\n- CVE-2016-3706\n- CVE-2016-4429\n- CVE-2017-1000366\n\nperl:\n\n- CVE-2015-8853\n- CVE-2016-1238\n- CVE-2016-2381\n- CVE-2016-6185\n\nlibssh2_org:\n\n- CVE-2016-0787\n\nutil-linux:\n\n- CVE-2016-5011\n- CVE-2017-2616\n\nncurses:\n\n- CVE-2017-10684\n- CVE-2017-10685\n- CVE-2017-11112\n- CVE-2017-11113\n\nlibksba:\n\n- CVE-2016-4574\n- CVE-2016-4579\n\nlibxml2:\n\n- CVE-2014-0191\n- CVE-2015-8806\n- CVE-2016-1762\n- CVE-2016-1833\n- CVE-2016-1834\n- CVE-2016-1835\n- CVE-2016-1837\n- CVE-2016-1838\n- CVE-2016-1839\n- CVE-2016-1840\n- CVE-2016-2073\n- CVE-2016-3627\n- CVE-2016-3705\n- CVE-2016-4447\n- CVE-2016-4448\n- CVE-2016-4449\n- CVE-2016-4483\n- CVE-2016-4658\n- CVE-2016-9318\n- CVE-2016-9597\n- CVE-2017-9047\n- CVE-2017-9048\n- CVE-2017-9049\n- CVE-2017-9050\n\nlibgcrypt:\n\n- CVE-2015-7511\n- CVE-2016-6313\n- CVE-2017-7526\n\nupdate-alternatives:\n\n- CVE-2015-0860\n\nsystemd:\n\n- CVE-2014-9770\n- CVE-2015-8842\n- CVE-2016-7796\n\ndbus-1:\n\n- CVE-2014-7824\n- CVE-2015-0245\n\nFinally, the following packages received non-security fixes:\n\n- augeas\n- bzip2\n- ca-certificates-mozilla\n- coreutils\n- cryptsetup\n- cyrus-sasl\n- dirmngr\n- e2fsprogs\n- findutils\n- gpg2\n- insserv-compat\n- kmod\n- libcap\n- libsolv\n- libzypp\n- lua51\n- lvm2\n- netcfg\n- p11-kit\n- permissions\n- procps\n- rpm\n- sed\n- sg3_utils\n- shadow\n- zypper\n","status":"published","published":"2017-10-10T19:37:36Z","modified":"2026-02-04T03:03:17.897778Z","updated_at":"2026-11-02T15:53:44.209561Z"}]}}