{"id":"CVE-2020-6096","title":"An exploitable signed comparison vulnerability exists in the ARMv7 memcpy() implementation of GNU glibc 2.30.9000","summary":"An exploitable signed comparison vulnerability exists in the ARMv7 memcpy() implementation of GNU glibc 2.30.9000. Calling memcpy() (on ARMv7 targets that utilize the GNU glibc implementation) with a negative value for the 'num' paramete…","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-195","CWE-191","CWE-681"],"vendor":"gnu","product":"glibc","affected":["glibc <= 2.31","fedora = 31","fedora = 32","debian_linux = 10.0"],"published":"2020-04-01","updated":"2026-10-14","sourceUpdated":"2026-10-14T09:17:19.140","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2020-6096","references":[{"url":"https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E","label":"talos-cna@cisco.com"},{"url":"https://lists.debian.org/debian-lts-announce/2022/10/msg00021.html","label":"talos-cna@cisco.com"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPYXTDOOB4PQGTYAMZAZNJIB3FF6YQXI/","label":"talos-cna@cisco.com"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/URXOIA2LDUKHQXK4BE55BQBRI6ZZG3Y6/","label":"talos-cna@cisco.com"},{"url":"https://security.gentoo.org/glsa/202101-20","label":"talos-cna@cisco.com"},{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=25620","label":"talos-cna@cisco.com"},{"url":"https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1019","label":"talos-cna@cisco.com"},{"url":"https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2022/10/msg00021.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPYXTDOOB4PQGTYAMZAZNJIB3FF6YQXI/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/URXOIA2LDUKHQXK4BE55BQBRI6ZZG3Y6/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/202101-20","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=25620","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1019","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-398330.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd"],"epss":0.05354,"epssPercentile":0.92471,"ingestedAt":"2026-10-14T09:24:26.054Z","slug":"CVE-2020-6096","body":"## Overview\n\nAn exploitable signed comparison vulnerability exists in the ARMv7 memcpy() implementation of GNU glibc 2.30.9000. Calling memcpy() (on ARMv7 targets that utilize the GNU glibc implementation) with a negative value for the 'num' parameter results in a signed comparison vulnerability. If an attacker underflows the 'num' parameter to memcpy(), this vulnerability could lead to undefined behavior such as writing to out-of-bounds memory and potentially remote code execution. Furthermore, this memcpy() implementation allows for program execution to continue in scenarios where a segmentation fault or crash should have occurred. The dangers occur in that subsequent execution and iterations of this code will be executed with this corrupted data.\n\n## Affected\n\n- `glibc <= 2.31`\n- `fedora = 31`\n- `fedora = 32`\n- `debian_linux = 10.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":44.6,"likelihood":1.1,"exploitation":0,"ransomware":0},"changes":[]}