How severe is CVE-2017-6419?

CVE-2017-6419 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-6419 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-6419?

CVE-2017-6419 affects Libmspack Project Libmspack. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-6419?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2017-6419 published?

CVE-2017-6419 was published on 2017-08-07 and last updated on 2026-06-17.

CVE-2017-6419

CVE-2017-6419 is a high-severity vulnerability in Libmspack Project Libmspack with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 6.8
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Libmspack Project Libmspack
Published: 2017-08-07
Last modified: 2026-06-17

Description

mspack/lzxd.c in libmspack 0.5alpha, as used in ClamAV 0.99.2, allows remote attackers to cause a denial of service (heap-based buffer overflow and application crash) or possibly have unspecified other impact via a crafted CHM file.

Frequently asked questions

What is CVE-2017-6419?: mspack/lzxd.c in libmspack 0.5alpha, as used in ClamAV 0.99.2, allows remote attackers to cause a denial of service (heap-based buffer overflow and application crash) or possibly have unspecified other impact via a crafted CHM file.
How severe is CVE-2017-6419?: CVE-2017-6419 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-6419 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-6419?: CVE-2017-6419 affects Libmspack Project Libmspack. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-6419?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2017-6419 published?: CVE-2017-6419 was published on 2017-08-07 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:libmspack_project:libmspack:0.5:alpha:*:*:*:*:*:*

More vulnerabilities in Libmspack Project Libmspack

CVE-2015-4472 — Medium (CVSS 6.8): Off-by-one error in the READ_ENCINT macro in chmd.c in libmspack before 0.5 allows remote attackers to cause a denial…
CVE-2018-18584 — Medium (CVSS 6.5): In mspack/cab.h in libmspack before 0.8alpha and cabextract before 1.8, the CAB block input buffer is one byte too…
CVE-2017-11423 — Medium (CVSS 5.5): The cabd_read_string function in mspack/cabd.c in libmspack 0.5alpha, as used in ClamAV 0.99.2 and other products,…
CVE-2014-9556 — Medium (CVSS 5.0): Integer overflow in the qtmd_decompress function in libmspack 0.4 allows remote attackers to cause a denial of service…
CVE-2015-4471 — Medium (CVSS 4.3): Off-by-one error in the lzxd_decompress function in lzxd.c in libmspack before 0.5 allows remote attackers to cause a…
CVE-2015-4470 — Medium (CVSS 4.3): Off-by-one error in the inflate function in mszipd.c in libmspack before 0.5 allows remote attackers to cause a denial…

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