{"id":"UBUNTU-CVE-2020-10756","details":"An out-of-bounds read vulnerability was found in the SLiRP networking implementation of the QEMU emulator. This flaw occurs in the icmp6_send_echoreply() routine while replying to an ICMP echo request, also known as ping. This flaw allows a malicious guest to leak the contents of the host memory, resulting in possible information disclosure. This flaw affects versions of libslirp before 4.3.1.","modified":"2026-04-22T13:57:50.378816Z","published":"2020-07-09T16:15:00Z","related":["USN-4437-1","USN-4467-1"],"upstream":["CVE-2020-10756"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-10756"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4437-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4467-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-10756"}],"affected":[{"package":{"name":"qemu","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/qemu@1:2.11+dfsg-1ubuntu7.31?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.11+dfsg-1ubuntu7.31"}]}],"versions":["1:2.10+dfsg-0ubuntu3","1:2.10+dfsg-0ubuntu4","1:2.10+dfsg-0ubuntu5","1:2.11+dfsg-1ubuntu1","1:2.11+dfsg-1ubuntu2","1:2.11+dfsg-1ubuntu4","1:2.11+dfsg-1ubuntu5","1:2.11+dfsg-1ubuntu6","1:2.11+dfsg-1ubuntu7","1:2.11+dfsg-1ubuntu7.1","1:2.11+dfsg-1ubuntu7.2","1:2.11+dfsg-1ubuntu7.3","1:2.11+dfsg-1ubuntu7.4","1:2.11+dfsg-1ubuntu7.5","1:2.11+dfsg-1ubuntu7.6","1:2.11+dfsg-1ubuntu7.7","1:2.11+dfsg-1ubuntu7.8","1:2.11+dfsg-1ubuntu7.9","1:2.11+dfsg-1ubuntu7.10","1:2.11+dfsg-1ubuntu7.12","1:2.11+dfsg-1ubuntu7.13","1:2.11+dfsg-1ubuntu7.14","1:2.11+dfsg-1ubuntu7.15","1:2.11+dfsg-1ubuntu7.17","1:2.11+dfsg-1ubuntu7.18","1:2.11+dfsg-1ubuntu7.19","1:2.11+dfsg-1ubuntu7.20","1:2.11+dfsg-1ubuntu7.21","1:2.11+dfsg-1ubuntu7.22","1:2.11+dfsg-1ubuntu7.23","1:2.11+dfsg-1ubuntu7.25","1:2.11+dfsg-1ubuntu7.26","1:2.11+dfsg-1ubuntu7.27","1:2.11+dfsg-1ubuntu7.28","1:2.11+dfsg-1ubuntu7.29"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"qemu","binary_version":"1:2.11+dfsg-1ubuntu7.31"},{"binary_name":"qemu-block-extra","binary_version":"1:2.11+dfsg-1ubuntu7.31"},{"binary_name":"qemu-guest-agent","binary_version":"1:2.11+dfsg-1ubuntu7.31"},{"binary_name":"qemu-kvm","binary_version":"1:2.11+dfsg-1ubuntu7.31"},{"binary_version":"1:2.11+dfsg-1ubuntu7.31","binary_name":"qemu-system"},{"binary_name":"qemu-system-arm","binary_version":"1:2.11+dfsg-1ubuntu7.31"},{"binary_version":"1:2.11+dfsg-1ubuntu7.31","binary_name":"qemu-system-common"},{"binary_name":"qemu-system-mips","binary_version":"1:2.11+dfsg-1ubuntu7.31"},{"binary_name":"qemu-system-misc","binary_version":"1:2.11+dfsg-1ubuntu7.31"},{"binary_version":"1:2.11+dfsg-1ubuntu7.31","binary_name":"qemu-system-ppc"},{"binary_name":"qemu-system-s390x","binary_version":"1:2.11+dfsg-1ubuntu7.31"},{"binary_name":"qemu-system-sparc","binary_version":"1:2.11+dfsg-1ubuntu7.31"},{"binary_name":"qemu-system-x86","binary_version":"1:2.11+dfsg-1ubuntu7.31"},{"binary_name":"qemu-user","binary_version":"1:2.11+dfsg-1ubuntu7.31"},{"binary_version":"1:2.11+dfsg-1ubuntu7.31","binary_name":"qemu-user-binfmt"},{"binary_version":"1:2.11+dfsg-1ubuntu7.31","binary_name":"qemu-user-static"},{"binary_name":"qemu-utils","binary_version":"1:2.11+dfsg-1ubuntu7.31"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-10756.json"}},{"package":{"name":"libslirp","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/libslirp@4.1.0-2ubuntu2.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.1.0-2ubuntu2.1"}]}],"versions":["4.0.0-1","4.0.0-2","4.1.0-1","4.1.0-2","4.1.0-2ubuntu1","4.1.0-2ubuntu2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"libslirp0","binary_version":"4.1.0-2ubuntu2.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-10756.json"}},{"package":{"name":"slirp4netns","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/slirp4netns@0.4.3-1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4.1-1","0.4.3-1"],"ecosystem_specific":{"binaries":[{"binary_name":"slirp4netns","binary_version":"0.4.3-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-10756.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]}