CVE-2019-17263

Name: CVE-2019-17263
Creator: NVD / NIST
Published: 2019-10-06T22:15:10.227+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 3.3/10EPSS 0.52%

Last modified Jun 17, 2026

CVE-2019-17263 is a low-severity vulnerability rated 3.3/10 on the CVSS scale. In libyal libfwsi before 20191006, libfwsi_extension_block_copy_from_byte_stream in libfwsi_extension_block.c has a heap-based buffer over-read because rejection of an unsupported size only considers values less than 6, even though values of 6 and 7 are also unsupported. NOTE: the vendor has disputed this as described in the GitHub issue. EPSS estimates a 0.52% chance of exploitation in the next 30 days.

Description

In libyal libfwsi before 20191006, libfwsi_extension_block_copy_from_byte_stream in libfwsi_extension_block.c has a heap-based buffer over-read because rejection of an unsupported size only considers values less than 6, even though values of 6 and 7 are also unsupported. NOTE: the vendor has disputed this as described in the GitHub issue

Metrics

CVSS 3.1

3.3/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

EPSS Probability

0.52%

40.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Libfwsi Project	Libfwsi	< 20191006

References

http://packetstormsecurity.com/files/154774/libyal-libfwsi-Buffer-Overread.htmlExploit, Third Party Advisory, VDB Entry
https://github.com/libyal/libfwsi/compare/20181227...20191006Patch, Third Party Advisory
https://github.com/libyal/libfwsi/issues/13Exploit, Third Party Advisory
http://packetstormsecurity.com/files/154774/libyal-libfwsi-Buffer-Overread.htmlExploit, Third Party Advisory, VDB Entry
https://github.com/libyal/libfwsi/compare/20181227...20191006Patch, Third Party Advisory
https://github.com/libyal/libfwsi/issues/13Exploit, Third Party Advisory

Timeline

Published: Oct 6, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-17263?

How severe is CVE-2019-17263?

CVE-2019-17263 has a CVSS score of 3.3/10 (LOW severity). The EPSS model estimates a 0.52% probability of exploitation in the next 30 days.

How do I fix CVE-2019-17263?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-17263?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST