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Fencer Vulns
high 8.1

CVE-2019-17543 in the critical feed json

LZ4 before 1.9.2 has a heap-based buffer overflow in LZ4_write32 (related to LZ4_compress_destSize), affecting applications that call LZ4_c…

published 2019-10-14 7 y ago modified 2026-10-14 25 d ago also EUVD-2019-7893

cvss
8.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
10.5%
EPSS 10.5% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known

Summary

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.) NOTE: the vendor states "only a few specific / uncommon usages of the API are at risk."

Patch / fix

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP V3.1.5
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
  • lz4 Debian 14, Debian 13, Debian 12 1.9.2-1

debian advisories DEBIAN-CVE-2019-17543

  • lz4 RHEL 8 1.8.3-5.el8_10
  • lz4-libs RHEL 8 1.8.3-5.el8_10

red hat advisories RHSA-2025:11035

  • lz4 SLE Software Development Kit 12 SP5 1.8.0-3.3.1
  • lz4 SLE Module for Basesystem 15 SP1, SLE Module for Basesystem 15 1.8.0-3.5.1

suse advisories SUSE-SU-2021:1613-1SUSE-SU-2019:2757-1

  • lz4 openSUSE Tumbleweed 1.9.3-1.5
  • lz4 openSUSE Leap 15.1 1.8.0-lp151.3.3.1
  • lz4-test openSUSE Leap 15.1 1.8.0-lp151.3.3.1
  • lz4 openSUSE Leap 15.0 1.8.0-lp150.2.3.1
  • lz4-test openSUSE Leap 15.0 1.8.0-lp150.2.3.1

opensuse advisories openSUSE-SU-2024:11034-1openSUSE-SU-2019:2399-1openSUSE-SU-2019:2398-1

  • lz4 AlmaLinux 8 1.8.3-5.el8_10
  • lz4-libs AlmaLinux 8 1.8.3-5.el8_10

almalinux advisories ALSA-2025:11035

  • lz4 Rocky Linux 8 1.8.3-5.el8_10

rocky linux advisories RLSA-2025:11035

  • lz4 Alpine 3.10 1.9.1-r1
  • lz4 Alpine 3.24, Alpine 3.23, Alpine 3.22 +11 more 1.9.2-r0

alpine advisories ALPINE-CVE-2019-17543

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-17543 updated cvss 8.1

lz4: heap-based buffer overflow in LZ4_write32

  • Red Hat Enterprise Linux 7 lz4 Red Hat OpenStack Platform 10 (Newton) lz4
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux BaseOS (v. 8) lz4 1.8.3-5.el8_10, lz4-libs 1.8.3-5.el8_10
    fixed: vendor fix RHSA-2025:11035

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-23-348-10 updated cvss 8.1

Siemens SIMATIC S7-1500

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.0, < 3.1.5
    affected: fixed in V3.1.5, mitigation support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-24-284-16 updated cvss 8.1

Rockwell Automation DataMosaix Private Cloud

  • Rockwell Automation DataMosaix Private Cloud <=7.07
    affected: mitigation “Rockwell Automation encourages users to implement security best practices to minimize the risk of the vulnerability.” rockwellautomation.custhelp.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
31 d ago

Exploit prediction

10.45% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.