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CVE-2019-17543

HIGH
8.1
CVSS Score
Published: October 14, 2019 at 01:09 AM UTC
Updated: October 14, 2026 at 07:16 AM UTC
1 product affected across 1 vendorLZ4

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Severity
HIGH8.1
Exploit prediction
EPSS 10%
SSVC
No known exploit

Description

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."

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

LZ4· Lz4-project
95%
v < 1.9.2
Affected range stops below 1.9.2, so it looks safe — our inference, not a vendor statement

References (20)

Vendor Advisoryx_refsource_SUSE
Source: [email protected]
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00069.html
Vendor Advisoryx_refsource_SUSE
Source: [email protected]
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00070.html
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=15941
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://github.com/lz4/lz4/compare/v1.9.1...v1.9.2
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://github.com/lz4/lz4/issues/801
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/lz4/lz4/pull/756
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/lz4/lz4/pull/760
Mailing Listx_refsource_MLIST
Source: [email protected]
https://lists.apache.org/thread.html/25015588b770d67470b7ba7ea49a305d6735dd7f00eabe7d50ec1e17%40%3Cissues.arrow.apache.org%3E

SSVC — Action Prioritization

SSVCNo known exploitAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.1HIGH[email protected]
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-787

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