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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.034 (88.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 88.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.032 · newest: 0.034 · change: +0.002
Affected products
- Lz4 Project
- 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
- Lz4 — versions lz4-1.8.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
- www.oracle.com//security-alerts/cpujul2021.html (Patch, Third Party Advisory)
- www.oracle.com/security-alerts/cpuoct2021.html (Patch, Third Party Advisory)
- www.oracle.com/security-alerts/cpuapr2022.html (Patch, Third Party Advisory)
- security.netapp.com/advisory/ntap-20211104-0005/ (Third Party Advisory)
- 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
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.