VDB-143441 · CVE-2019-17543 · ID 801

LZ4 up to 1.9.1 LZ4_write32 buffer overflow

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.5	$0-$5k	0.00

Summaryinfo

A vulnerability marked as critical has been reported in LZ4 up to 1.9.1. Affected by this issue is the function LZ4_write32. The manipulation leads to buffer overflow. This vulnerability is documented as CVE-2019-17543. The attack can be initiated remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in LZ4 up to 1.9.1. It has been rated as critical. This issue affects the function LZ4_write32. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

LZ4 before 1.9.2 has a heap-based buffer overflow in LZ4_write32 (related to LZ4_compress_destSize), affecting applications that call LZ4_compress_fast with a large input. (This issue can also lead to data corruption.)

The weakness was released 10/14/2019. The identification of this vulnerability is CVE-2019-17543 since 10/14/2019. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 242130 (Oracle Linux 8 : lz4 (ELSA-2025-11035)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.9.2 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (242130) and CERT Bund (WID-SEC-2025-1550). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

Red Hat Enterprise Linux

Productinfo

Name

Version

Website

Product: https://github.com/lz4/lz4/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.7
VulDB Meta Temp Score: 7.5

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.1
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 242130
Nessus Name: Oracle Linux 8 : lz4 (ELSA-2025-11035)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: LZ4 1.9.2
Patch: github.com

Timelineinfo

10/14/2019 🔍
10/14/2019 +0 days 🔍
10/14/2019 +0 days 🔍
07/16/2025 +2102 days 🔍

Sourcesinfo

Product: github.com

Advisory: 801
Status: Confirmed

CVE: CVE-2019-17543 (🔍)
GCVE (CVE): GCVE-0-2019-17543
GCVE (VulDB): GCVE-100-143441
CERT Bund: WID-SEC-2025-1550 - Red Hat Enterprise Linux (LZ4): Schwachstelle ermöglicht nicht spezifizierten Angriff

Entryinfo

Created: 10/14/2019 08:18
Updated: 07/16/2025 02:09
Changes: 10/14/2019 08:18 (36), 10/14/2019 08:23 (17), 01/08/2024 11:52 (6), 01/08/2024 11:59 (1), 07/15/2025 13:42 (23), 07/16/2025 02:09 (2)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.