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Buffer overflow in LZ4 archiver

Published: 2019-11-04
Severity High
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2019-17543
Exploitation vector Network
Public exploit N/A
Vulnerable software
Client/Desktop applications / Software for archiving

Vendor LZ4

Security Advisory

This security advisory describes one high risk vulnerability.

1) Heap-based buffer overflow

Severity: High

CVSSv3: 7.1 [CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2019-17543

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: No


The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the LZ4_write32 when performing archiving operation with LZ4_compress_fast. A remote attacker can pass specially crafted input to the application, trigger heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.


Install updates from vendor's website.

Vulnerable software versions

LZ4: 1.7.3, 1.7.4,, 1.7.5, 1.8.0, 1.8.1,, 1.8.2, 1.8.3, 1.9.0, 1.9.1

CPE External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to open a a specially crafted archive.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.