Buffer overflow in Lz4 Project
CVE-2021-3520
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.
Vulnerability class: Integer Overflow
EPSS: 0.032 (87.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Lz4_project Lz4
- Netapp Active_iq_unified_manager
- Netapp Cloud_backup
- Netapp Ontap_select_deploy_administration_utility
- Oracle Communications_cloud_native_core_policy — versions 1.14.0
- Oracle Zfs_storage_appliance_kit — versions 8.8
- Splunk Universal_forwarder — versions 9.1.0
- N/a Lz4 — versions lz4-1.8.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- secalert@redhat.com (Patch, Third Party Advisory, x_refsource_MISC, Issue Tracking)
- secalert@redhat.com (Patch, Third Party Advisory, x_refsource_MISC)
- secalert@redhat.com (Patch, Third Party Advisory, x_refsource_MISC)
- secalert@redhat.com (Patch, Third Party Advisory, x_refsource_MISC)
- secalert@redhat.com (x_refsource_CONFIRM, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-3520?
- CVE-2021-3520 is a critical-severity vulnerability in Lz4 Project, classified under Integer Overflow or Wraparound. CVSS score: 9.8/10. Published 2021-06-02.
- How severe is CVE-2021-3520?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-3520 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.