critical
CVE-2021-3520
lz4: memory corruption due to an integer overflow bug caused by memmove argument
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.
Severity by source
NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Red Hat8.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Julia9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Trivy's own label is CRITICAL. Rated critical by NVD, Julia, Photon OS. Rated lower by Red Hat (medium), AlmaLinux (medium), Amazon (medium), Oracle (medium), Rocky Linux (medium), Ubuntu (medium).
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.
Affected packages and fixed versions
| Source | Package | Fixed in |
|---|---|---|
| julia::Julia Ecosystem Security Advisories | Lz4_jll | 1.9.4+0 |
| Photon OS 2.0 | lz4 | 1.9.2-2.ph2 |
| Photon OS 3.0 | librdkafka, lz4, mysql | 1.5.0-1.ph3 and 2 more |
| Photon OS 4.0 | librdkafka, librdkafka-devel, lz4 and 4 more | 1.5.0-2.ph4 and 2 more |
| Photon OS 5.0 | librdkafka, librdkafka-devel, mysql and 2 more | 1.8.2-2.ph5 and 1 more |
| alma 8 | lz4, lz4-devel, lz4-libs | 1.8.3-3.el8_4 |
| alpine 3.12 | lz4 | 1.9.2-r1 |
| alpine 3.13 | lz4 | 1.9.2-r1 |
| alpine 3.14 | lz4 | 1.9.3-r1 |
| alpine 3.15 | lz4 | 1.9.3-r1 |
| alpine 3.16 | lz4 | 1.9.3-r1 |
| alpine 3.17 | lz4 | 1.9.3-r1 |
Show all 73 entries from 41 sources
| Source | Package | Fixed in |
|---|---|---|
| julia::Julia Ecosystem Security Advisories | Lz4_jll | 1.9.4+0 |
| Photon OS 2.0 | lz4 | 1.9.2-2.ph2 |
| Photon OS 3.0 | librdkafka | 1.5.0-1.ph3 |
| Photon OS 3.0 | lz4 | 1.9.3-2.ph3 |
| Photon OS 3.0 | mysql | 8.0.34-1.ph3 |
| Photon OS 4.0 | librdkafka | 1.5.0-2.ph4 |
| Photon OS 4.0 | librdkafka-devel | 1.5.0-2.ph4 |
| Photon OS 4.0 | lz4 | 1.9.2-2.ph4 |
| Photon OS 4.0 | lz4-devel | 1.9.2-2.ph4 |
| Photon OS 4.0 | mysql | 8.0.34-1.ph4 |
| Photon OS 4.0 | mysql-devel | 8.0.34-1.ph4 |
| Photon OS 4.0 | mysql-icu-data-files | 8.0.34-1.ph4 |
| Photon OS 5.0 | librdkafka | 1.8.2-2.ph5 |
| Photon OS 5.0 | librdkafka-devel | 1.8.2-2.ph5 |
| Photon OS 5.0 | mysql | 8.0.34-1.ph5 |
| Photon OS 5.0 | mysql-devel | 8.0.34-1.ph5 |
| Photon OS 5.0 | mysql-icu-data-files | 8.0.34-1.ph5 |
| alma 8 | lz4 | 1.8.3-3.el8_4 |
| alma 8 | lz4-devel | 1.8.3-3.el8_4 |
| alma 8 | lz4-libs | 1.8.3-3.el8_4 |
| alpine 3.12 | lz4 | 1.9.2-r1 |
| alpine 3.13 | lz4 | 1.9.2-r1 |
| alpine 3.14 | lz4 | 1.9.3-r1 |
| alpine 3.15 | lz4 | 1.9.3-r1 |
| alpine 3.16 | lz4 | 1.9.3-r1 |
| alpine 3.17 | lz4 | 1.9.3-r1 |
| alpine 3.18 | lz4 | 1.9.3-r1 |
| alpine 3.19 | lz4 | 1.9.3-r1 |
| alpine 3.20 | lz4 | 1.9.3-r1 |
| alpine 3.21 | lz4 | 1.9.3-r1 |
| alpine 3.22 | lz4 | 1.9.3-r1 |
| alpine 3.23 | lz4 | 1.9.3-r1 |
| alpine 3.24 | lz4 | 1.9.3-r1 |
| alpine edge | lz4 | 1.9.3-r1 |
| amazon linux 2022 | lz4 | 1.9.4-1.amzn2022.0.1 |
| amazon linux 2022 | lz4-debuginfo | 1.9.4-1.amzn2022.0.1 |
| amazon linux 2022 | lz4-debugsource | 1.9.4-1.amzn2022.0.1 |
| amazon linux 2022 | lz4-devel | 1.9.4-1.amzn2022.0.1 |
| amazon linux 2022 | lz4-libs | 1.9.4-1.amzn2022.0.1 |
| amazon linux 2022 | lz4-libs-debuginfo | 1.9.4-1.amzn2022.0.1 |
| amazon linux 2022 | lz4-static | 1.9.4-1.amzn2022.0.1 |
| amazon linux 2023 | lz4 | 1.9.4-1.amzn2023.0.2 |
| amazon linux 2023 | lz4-debuginfo | 1.9.4-1.amzn2023.0.2 |
| amazon linux 2023 | lz4-debugsource | 1.9.4-1.amzn2023.0.2 |
| amazon linux 2023 | lz4-devel | 1.9.4-1.amzn2023.0.2 |
| amazon linux 2023 | lz4-libs | 1.9.4-1.amzn2023.0.2 |
| amazon linux 2023 | lz4-libs-debuginfo | 1.9.4-1.amzn2023.0.2 |
| amazon linux 2023 | lz4-static | 1.9.4-1.amzn2023.0.2 |
| conan::GitLab Advisory Database Community | lz4 | 1.9.2 |
| debian 10 | lz4 | 1.8.3-1+deb10u1 |
| debian 11 | lz4 | 1.9.3-2 |
| debian 12 | lz4 | 1.9.3-2 |
| debian 13 | lz4 | 1.9.3-2 |
| debian 14 | lz4 | 1.9.3-2 |
| debian 9 | lz4 | 0.0~r131-2+deb9u1 |
| echo | lz4 | 1.9.3-2 |
| Oracle Linux 8 | lz4 | 1.8.3-3.el8_4 |
| Oracle Linux 8 | lz4-devel | 1.8.3-3.el8_4 |
| Oracle Linux 8 | lz4-libs | 1.8.3-3.el8_4 |
| Red Hat | lz4 | no fix listed |
| Red Hat | lz4-devel | no fix listed |
| Red Hat | lz4-static | no fix listed |
| rocky 8 | lz4 | 1.8.3-3.el8_4 |
| rocky 8 | lz4-devel | 1.8.3-3.el8_4 |
| rocky 8 | lz4-libs | 1.8.3-3.el8_4 |
| ubuntu 14.04-ESM | lz4 | 0.0~r114-2ubuntu1+esm2 |
| ubuntu 16.04-ESM | lz4 | 0.0~r131-2ubuntu2+esm1 |
| ubuntu 18.04 | lz4 | 0.0~r131-2ubuntu3.1 |
| ubuntu 18.04-ESM | lz4 | 0.0~r131-2ubuntu3.1 |
| ubuntu 20.04 | lz4 | 1.9.2-2ubuntu0.20.04.1 |
| ubuntu 20.04-ESM | lz4 | 1.9.2-2ubuntu0.20.04.1 |
| ubuntu 20.10 | lz4 | 1.9.2-2ubuntu0.20.10.1 |
| ubuntu 21.04 | lz4 | 1.9.3-1ubuntu0.1 |
References
- https://access.redhat.com/security/cve/CVE-2021-3520
- https://bugzilla.redhat.com/show_bug.cgi?id=1954559
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3520
- https://errata.almalinux.org/8/ALSA-2021-2575.html
- https://errata.rockylinux.org/RLSA-2021:2575
- https://github.com/lz4/lz4/pull/972
- https://linux.oracle.com/cve/CVE-2021-3520.html
All 17 references
- https://linux.oracle.com/errata/ELSA-2021-2575.html
- https://nvd.nist.gov/vuln/detail/CVE-2021-3520
- https://security.netapp.com/advisory/ntap-20211104-0005/
- https://ubuntu.com/security/notices/USN-4968-1
- https://ubuntu.com/security/notices/USN-4968-2
- https://www.cve.org/CVERecord?id=CVE-2021-3520
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://www.oracle.com/security-alerts/cpuoct2021.html