CVE-2021-3520There's a flaw in lz4.
Updated under an hour ago ()
Does this affect you?
It affects Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP and 9 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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 CRITICAL (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-190
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Modified
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
lz4_project lz4 lz4_project:lz4 | from 1.8.3 before 1.9.4 | NVD |
netapp active_iq_unified_manager netapp:active_iq_unified_manager | all versions | NVD |
netapp cloud_backup netapp:cloud_backup | all versions | NVD |
netapp ontap_select_deploy_administration_utility netapp:ontap_select_deploy_administration_utility | all versions | NVD |
oracle communications_cloud_native_core_policy oracle:communications_cloud_native_core_policy | 1.14.0 | NVD |
oracle zfs_storage_appliance_kit oracle:zfs_storage_appliance_kit | 8.8 | NVD |
splunk universal_forwarder splunk:universal_forwarder | from 8.2.0 before 8.2.12; from 9.0.0 before 9.0.6; 9.1.0 | NVD |
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1954559x-refsource-misc, issue-tracking, patch, third-party-advisory
- https://www.oracle.com//security-alerts/cpujul2021.htmlx-refsource-misc, patch, third-party-advisory
- https://www.oracle.com/security-alerts/cpuoct2021.htmlx-refsource-misc, patch, third-party-advisory
- https://www.oracle.com/security-alerts/cpuapr2022.htmlx-refsource-misc, patch, third-party-advisory
- https://security.netapp.com/advisory/ntap-20211104-0005/x-refsource-confirm, third-party-advisory
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.