CVE-2021-3520
criticalThere's a flaw in lz4.
Vendor / product: Lz4 Project — lz4
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.
CVSS
9.8
9.8 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2021-06-02 13:15
Modified: 2026-10-14 10:17
NVD status: Modified
Last synced 3 days ago
Verified against the source API 2026-10-27 07:06 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
lz4_project / lz4 ≥1.8.3 <1.9.4
netapp / active_iq_unified_manager all versions
netapp / cloud_backup all versions
netapp / ontap_select_deploy_administration_utility all versions
oracle / communications_cloud_native_core_policy 1.14.0
oracle / zfs_storage_appliance_kit 8.8
splunk / universal_forwarder ≥8.2.0 <8.2.12, ≥9.0.0 <9.0.6, 9.1.0
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Patch / mitigation: https://bugzilla.redhat.com/show_bug.cgi?id=1954559
Patch / mitigation: https://www.oracle.com//security-alerts/cpujul2021.html
Patch / mitigation: https://www.oracle.com/security-alerts/cpuapr2022.html
Patch / mitigation: https://www.oracle.com/security-alerts/cpuoct2021.html
Patch / mitigation: https://bugzilla.redhat.com/show_bug.cgi?id=1954559
Patch / mitigation: https://www.oracle.com//security-alerts/cpujul2021.html
Patch / mitigation: https://www.oracle.com/security-alerts/cpuapr2022.html
Patch / mitigation: https://www.oracle.com/security-alerts/cpuoct2021.html
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1954559 secalert@redhat.com
- https://security.netapp.com/advisory/ntap-20211104-0005/ secalert@redhat.com
- https://www.oracle.com//security-alerts/cpujul2021.html secalert@redhat.com
- https://www.oracle.com/security-alerts/cpuapr2022.html secalert@redhat.com
- https://www.oracle.com/security-alerts/cpuoct2021.html secalert@redhat.com
- https://bugzilla.redhat.com/show_bug.cgi?id=1954559 af854a3a-2127-422b-91ae-364da2661108
- https://security.netapp.com/advisory/ntap-20211104-0005/ af854a3a-2127-422b-91ae-364da2661108
- https://www.oracle.com//security-alerts/cpujul2021.html af854a3a-2127-422b-91ae-364da2661108
- https://www.oracle.com/security-alerts/cpuapr2022.html af854a3a-2127-422b-91ae-364da2661108
- https://www.oracle.com/security-alerts/cpuoct2021.html af854a3a-2127-422b-91ae-364da2661108
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 07:06 UTC · record ↗