{"id":"CVE-2021-3520","aliases":["ALPINE-CVE-2021-3520","ALSA-2021:2575","AZL-74241","BELL-CVE-2021-3520","CLSA-2023-1695326199","CLSA-2026-1777307383","CLSA-2026-1792171196","DEBIAN-CVE-2021-3520","DLA-2657-1","DSA-4919-1","EUVD-2021-26836","GHSA-gmc7-pqv9-966m","JLSEC-2026-532","MGASA-2021-0229","OESA-2021-1245","RHSA-2021:2575","RLSA-2021:2575","SUSE-SU-2021:1613-1","SUSE-SU-2021:1647-1","SUSE-SU-2021:1825-1","UBUNTU-CVE-2021-3520","USN-4968-1","USN-4968-2","openSUSE-SU-2021:0760-1","openSUSE-SU-2021:1825-1","openSUSE-SU-2024:11562-1","openSUSE-SU-2024:12902-1"],"status":"published","title":"There's a flaw in lz4. An attacker who submits a crafted file to an application linked with lz4...","description":"There's a flaw in lz4. An attacker who submits a crafted file to an application linked with lz4 may be able to trigger an integer overflow, leading to calling of memmove() on a negative size argument, causing an out-of-bounds write and/or a crash. The greatest impact of this flaw is to availability, with some potential impact to confidentiality and integrity as well.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.03401,"percentile":0.88935,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-190","CWE-787"],"published":"2021-04-30T00:00:00Z","modified":"2026-11-05T05:36:30Z","fixes":[{"ecosystem":"Alpine:v3.12","package":"lz4","fixed_in":["1.9.2-r1"],"sources":["osv"]},{"ecosystem":"Alpine:v3.13","package":"lz4","fixed_in":["1.9.2-r1"],"sources":["osv"]},{"ecosystem":"Alpine:v3.14","package":"lz4","fixed_in":["1.9.3-r1"],"sources":["osv"]},{"ecosystem":"Alpine:v3.15","package":"lz4","fixed_in":["1.9.3-r1"],"sources":["osv"]},{"ecosystem":"Alpine:v3.16","package":"lz4","fixed_in":["1.9.3-r1"],"sources":["osv"]},{"ecosystem":"Alpine:v3.17","package":"lz4","fixed_in":["1.9.3-r1"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"lz4","fixed_in":["1.9.3-r1"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"lz4","fixed_in":["1.9.3-r1"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"lz4","fixed_in":["1.9.3-r1"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"lz4","fixed_in":["1.9.3-r1"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"lz4","fixed_in":["1.9.3-r1"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"lz4","fixed_in":["1.9.3-r1"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"lz4","fixed_in":["1.9.3-r1"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"lz4","fixed_in":["1.8.3-3.el8_4"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"lz4-devel","fixed_in":["1.8.3-3.el8_4"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"lz4-libs","fixed_in":["1.8.3-3.el8_4"],"sources":["osv"]},{"ecosystem":"TuxCare:CentOS:7","package":"lz4","fixed_in":["1.8.3-1.el7.tuxcare.els1"],"sources":["osv"]},{"ecosystem":"TuxCare:CentOS:7","package":"lz4-devel","fixed_in":["1.8.3-1.el7.tuxcare.els1"],"sources":["osv"]},{"ecosystem":"TuxCare:CentOS:7","package":"lz4-static","fixed_in":["1.8.3-1.el7.tuxcare.els1"],"sources":["osv"]},{"ecosystem":"TuxCare:OracleLinux:7","package":"lz4","fixed_in":["1.8.3-1.el7.tuxcare.els1"],"sources":["osv"]},{"ecosystem":"TuxCare:OracleLinux:7","package":"lz4-devel","fixed_in":["1.8.3-1.el7.tuxcare.els1"],"sources":["osv"]},{"ecosystem":"TuxCare:OracleLinux:7","package":"lz4-static","fixed_in":["1.8.3-1.el7.tuxcare.els1"],"sources":["osv"]},{"ecosystem":"TuxCare:RHEL:7","package":"lz4","fixed_in":["1.8.3-1.el7.tuxcare.els1"],"sources":["osv"]},{"ecosystem":"TuxCare:RHEL:7","package":"lz4-devel","fixed_in":["1.8.3-1.el7.tuxcare.els1"],"sources":["osv"]},{"ecosystem":"TuxCare:RHEL:7","package":"lz4-static","fixed_in":["1.8.3-1.el7.tuxcare.els1"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"lz4","fixed_in":["1.9.3-2"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"lz4","fixed_in":["1.9.3-2"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"lz4","fixed_in":["1.9.3-2"],"sources":["osv"]},{"ecosystem":"Debian:9","package":"lz4","fixed_in":["0.0~r131-2+deb9u1"],"sources":["osv"]},{"ecosystem":"Debian:10","package":"lz4","fixed_in":["1.8.3-1+deb10u1"],"sources":["osv"]},{"ecosystem":"Julia","package":"Lz4_jll","fixed_in":["1.9.4+0"],"sources":["osv"]},{"ecosystem":"Mageia:7","package":"lz4","fixed_in":["1.9.2-1.1.mga7"],"sources":["osv"]},{"ecosystem":"Mageia:8","package":"lz4","fixed_in":["1.9.3-1.1.mga8"],"sources":["osv"]},{"ecosystem":"openEuler:20.03-LTS-SP1","package":"lz4","fixed_in":["1.9.2-3.oe1"],"sources":["osv"]},{"ecosystem":"Red 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Advisory","advisory","web"]},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-398330.html","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3520","tags":["web","advisory"]},{"url":"https://access.redhat.com/errata/RHBA-2021:2854"},{"url":"https://access.redhat.com/errata/RHSA-2021:2575","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2022:1345"},{"url":"https://access.redhat.com/errata/RHSA-2022:5606"},{"url":"https://access.redhat.com/errata/RHSA-2022:6407"},{"url":"https://access.redhat.com/security/cve/CVE-2021-3520","tags":["report"]},{"url":"https://security.netapp.com/advisory/ntap-20211104-0005"},{"url":"https://github.com/advisories/GHSA-gmc7-pqv9-966m"},{"url":"https://security.alpinelinux.org/vuln/CVE-2021-3520","tags":["advisory"]},{"url":"https://errata.almalinux.org/8/ALSA-2021-2575.html","tags":["advisory"]},{"url":"https://vulners.com/cve/CVE-2021-3520","tags":["report"]},{"url":"https://docs.bell-sw.com/security/cves/CVE-2021-3520","tags":["advisory"]},{"url":"https://errata.cloudlinux.com/centos7-els/CLSA-2023-1695326199.html","tags":["advisory"]},{"url":"https://errata.tuxcare.com/els_os/oraclelinux7els/CLSA-2026-1777307383.html","tags":["advisory"]},{"url":"https://errata.tuxcare.com/els_os/rhel7els/CLSA-2026-1792171196.html","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-3520","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2021-0229.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=28990","tags":["report"]},{"url":"https://www.debian.org/security/2021/dsa-4919","tags":["web"]},{"url":"https://ubuntu.com/security/notices/USN-4968-1","tags":["advisory"]},{"url":"https://openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1245","tags":["advisory"]},{"url":"https://access.redhat.com/security/updates/classification/#moderate","tags":["article"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_2575.json","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-3520","tags":["advisory","report"]},{"url":"https://errata.rockylinux.org/RLSA-2021:2575","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2021/suse-su-20211613-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1153936","tags":["report"]},{"url":"https://bugzilla.suse.com/1185438","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2019-17543","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-3520","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2021/suse-su-20211647-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2021/suse-su-20211825-1/","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-3520","tags":["report"]},{"url":"https://github.com/lz4/lz4/pull/972","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-4968-2","tags":["advisory"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/Y6JSYGHG2J4E7C5MDUDUDEILIMZKTM7H/","tags":["advisory"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/MA4LQPPDXUEKHDKVDM24RJVHSV2EC67P/","tags":["advisory"]},{"url":"","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2021-3520","description":"There's 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The greatest impact of this flaw is to availability, with some potential impact to confidentiality and integrity as well.","status":"published","published":"2021-06-02T12:32:32Z","modified":"2026-10-14T09:49:43Z","updated_at":"2026-11-02T17:27:16.85534Z"}],"ghsa":[{"id":"GHSA-gmc7-pqv9-966m","title":"There's a flaw in lz4. An attacker who submits a crafted file to an application linked with lz4...","description":"There's a flaw in lz4. An attacker who submits a crafted file to an application linked with lz4 may be able to trigger an integer overflow, leading to calling of memmove() on a negative size argument, causing an out-of-bounds write and/or a crash. 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The greatest impact of this flaw is to availability, with some potential impact to confidentiality and integrity as well.","status":"published","published":"2026-05-26T19:04:01.666Z","modified":"2026-07-18T00:01:01.037209547Z","cvss":[{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:47:18.573531Z"},{"id":"OESA-2021-1245","title":"lz4 security update","description":"LZ4 is lossless compression algorithm, providing compression speed \u003e 500 MB/s per core (\u003e0.15 Bytes/cycle). It features an extremely fast decoder, with speed in multiple GB/s per core (~1 Byte/cycle). A high compression derivative, called LZ4_HC, is available, trading customizable CPU time for compression ratio.\r\n\r\nSecurity Fix(es):\r\n\r\nThere s a flaw in lz4. An attacker who submits a crafted file to an application linked with lz4 may be able to trigger an integer overflow, leading to calling of memmove() on a negative size argument, causing an out-of-bounds write and/or a crash. The greatest impact of this flaw is to availability, with some potential impact to confidentiality and integrity as well.(CVE-2021-3520)","status":"published","published":"2021-06-26T11:04:29Z","modified":"2026-08-18T01:15:12.349691586Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:52:38.987987Z"},{"id":"RHSA-2021:2575","title":"Red Hat Security Advisory: lz4 security update","status":"published","published":"2024-09-16T06:01:58Z","modified":"2026-10-13T10:02:23Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:08.619234Z"},{"id":"RLSA-2021:2575","title":"Moderate: lz4 security update","description":"The lz4 packages provide support for LZ4, a very fast, lossless compression algorithm that provides compression speeds of 400 MB/s per core and scales with multicore CPUs. It also features an extremely fast decoder that reaches speeds of multiple GB/s per core and typically reaches RAM speed limits on multicore systems.\n\nSecurity Fix(es):\n\n* lz4: memory corruption due to an integer overflow bug caused by memmove argument (CVE-2021-3520)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.","status":"published","published":"2021-06-29T13:43:40Z","modified":"2026-02-05T01:15:07.351751Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:23.969672Z"},{"id":"UBUNTU-CVE-2021-3520","description":"There's a flaw in lz4. An attacker who submits a crafted file to an application linked with lz4 may be able to trigger an integer overflow, leading to calling of memmove() on a negative size argument, causing an out-of-bounds write and/or a crash. The greatest impact of this flaw is to availability, with some potential impact to confidentiality and integrity as well.","status":"published","published":"2021-04-30T00:00:00Z","modified":"2026-04-22T12:55:30.263475Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:54:27.870979Z"},{"id":"ALSA-2021:2575","title":"Moderate: lz4 security update","description":"The lz4 packages provide support for LZ4, a very fast, lossless compression algorithm that provides compression speeds of 400 MB/s per core and scales with multicore CPUs. It also features an extremely fast decoder that reaches speeds of multiple GB/s per core and typically reaches RAM speed limits on multicore systems.\n\nSecurity Fix(es):\n\n* lz4: memory corruption due to an integer overflow bug caused by memmove argument (CVE-2021-3520)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.","status":"published","published":"2021-06-29T13:43:40Z","modified":"2026-10-29T11:01:00.449890646Z","updated_at":"2026-11-02T15:27:51.196609Z"},{"id":"CLSA-2023-1695326199","title":"lz4: Fix of CVE-2021-3520","description":"- CVE-2021-3520: Fix potential memory corruption with negative memmove() size","status":"published","published":"2023-09-21T20:57:15Z","modified":"2026-06-01T00:33:17.177578205Z","updated_at":"2026-11-02T15:43:40.509998Z"},{"id":"CLSA-2026-1777307383","title":"lz4: Fix of CVE-2021-3520","description":"- CVE-2021-3520: Fix potential memory corruption with negative memmove() size","status":"published","published":"2026-04-27T16:29:48Z","modified":"2026-06-01T00:33:27.201329904Z","updated_at":"2026-11-02T15:43:44.384419Z"},{"id":"CLSA-2026-1792171196","title":"lz4: Fix of CVE-2021-3520","description":"- CVE-2021-3520: Fix potential memory corruption with negative memmove() size","status":"published","published":"2026-10-16T17:20:07Z","modified":"2026-10-26T09:32:00.767031444Z","updated_at":"2026-11-02T15:43:51.747192Z"},{"id":"DLA-2657-1","title":"lz4 - security update","status":"published","published":"2021-05-12T00:00:00Z","modified":"2026-03-09T01:23:03.569865Z","updated_at":"2026-11-02T15:46:10.712745Z"},{"id":"DSA-4919-1","title":"lz4 - security update","status":"published","published":"2021-05-21T00:00:00Z","modified":"2026-03-09T02:09:10.222557Z","updated_at":"2026-11-02T15:46:17.19998Z"},{"id":"MGASA-2021-0229","title":"Updated lz4 packages fix a security vulnerability","description":"An attacker who submits a crafted file to an application linked with lz4 may be able to trigger an integer overflow, leading to calling of memmove() on a negative size argument, causing an out-of-bounds write and/or a crash. The greatest impact of this flaw is to availability, with some potential impact to confidentiality and integrity as well (CVE-2021-3520).\n","status":"published","published":"2021-06-08T14:33:02Z","modified":"2026-04-16T04:43:24.314370018Z","updated_at":"2026-11-02T15:49:41.509337Z"},{"id":"openSUSE-SU-2021:0760-1","title":"Security update for lz4","description":"This update for lz4 fixes the following issues:\n\n- CVE-2021-3520: Fixed memory corruption due to an integer overflow bug caused by memmove argument (bsc#1185438).\n\nThis update was imported from the SUSE:SLE-15:Update update project.","status":"published","published":"2021-05-22T05:03:39Z","modified":"2026-02-04T04:09:25.161398Z","updated_at":"2026-11-02T16:58:31.879684Z"},{"id":"openSUSE-SU-2021:1825-1","title":"Security update for lz4","description":"This update for lz4 fixes the following issues:\n\n- CVE-2021-3520: Fixed memory corruption due to an integer overflow bug caused by memmove argument (bsc#1185438).\n","status":"published","published":"2021-07-10T17:40:34Z","modified":"2026-02-04T02:22:50.91782Z","updated_at":"2026-11-02T16:58:32.266854Z"},{"id":"openSUSE-SU-2024:11562-1","title":"liblz4-1-1.9.3-2.1 on GA media","description":"These are all security issues fixed in the liblz4-1-1.9.3-2.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T04:40:27.679699Z","updated_at":"2026-11-02T16:58:35.195147Z"},{"id":"openSUSE-SU-2024:12902-1","title":"librdkafka-devel-2.1.0-1.1 on GA media","description":"These are all security issues fixed in the librdkafka-devel-2.1.0-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T04:27:02.363117Z","updated_at":"2026-11-02T16:58:36.025801Z"},{"id":"SUSE-SU-2021:1613-1","title":"Security update for lz4","description":"This update for lz4 fixes the following issues:\n\n- CVE-2021-3520: Fixed memory corruption due to an integer overflow bug caused by memmove argument (bsc#1185438).\n- CVE-2019-17543: Fixed heap-based buffer overflow in LZ4_write32 (bsc#1153936).\n","status":"published","published":"2021-05-14T15:35:25Z","modified":"2026-02-04T03:18:25.789263Z","updated_at":"2026-11-02T15:53:49.138643Z"},{"id":"SUSE-SU-2021:1647-1","title":"Security update for lz4","description":"This update for lz4 fixes the following issues:\n\n- CVE-2021-3520: Fixed memory corruption due to an integer overflow bug caused by memmove argument (bsc#1185438).\n","status":"published","published":"2021-05-19T11:59:45Z","modified":"2025-05-02T04:31:34.027033Z","updated_at":"2026-11-02T15:53:49.138643Z"},{"id":"SUSE-SU-2021:1825-1","title":"Security update for lz4","description":"This update for lz4 fixes the following issues:\n\n- CVE-2021-3520: Fixed memory corruption due to an integer overflow bug caused by memmove argument (bsc#1185438).\n","status":"published","published":"2021-06-01T14:24:04Z","modified":"2026-02-04T03:30:10.01035Z","updated_at":"2026-11-02T15:53:49.138643Z"},{"id":"USN-4968-1","title":"lz4 vulnerability","description":"It was discovered that LZ4 incorrectly handled certain memory operations.\nIf a user or automated system were tricked into uncompressing a specially-\ncrafted LZ4 file, a remote attacker could use this issue to cause LZ4 to\ncrash, resulting in a denial of service, or possibly execute arbitrary\ncode.\n","status":"published","published":"2021-05-26T17:29:47Z","modified":"2026-04-22T10:15:06.779322Z","updated_at":"2026-11-02T16:58:15.159055Z"},{"id":"USN-4968-2","title":"lz4 vulnerability","description":"USN-4968-1 fixed a vulnerability in LZ4. This update provides\nthe corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.\n\nOriginal advisory details:\n\n It was discovered that LZ4 incorrectly handled certain memory operations.\n If a user or automated system were tricked into uncompressing a specially-\n crafted LZ4 file, a remote attacker could use this issue to cause LZ4 to\n crash, resulting in a denial of service, or possibly execute arbitrary\n code.\n","status":"published","published":"2021-05-31T12:08:03Z","modified":"2026-06-29T13:49:02.122366296Z","updated_at":"2026-11-02T16:58:15.159055Z"}]}}