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Vulnerability record · CVE-2017-17969 · published 30 January 2018

CVE-2017-17969: 7-zip out-of-bounds write vulnerability

7 Zip · 7 Zip

Heap-based buffer overflow in the NCompress::NShrink::CDecoder::CodeReal method in 7-Zip before 18.00 and p7zip allows remote attackers to cause a denial of service (out-of-bounds write) or potentially execute arbitrary code via a crafted ZIP archive.

7.8 CVSS 3.0 High EPSS 4.9% · top 8.2% CWE-787 · Out-of-bounds write
7.8CVSS 3.0 base score, v2 6.8
4.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
13References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Heap-based buffer overflow in the NCompress::NShrink::CDecoder::CodeReal method in 7-Zip before 18.00 and p7zip allows remote attackers to cause a denial of service (out-of-bounds write) or potentially execute arbitrary code via a crafted ZIP archive.

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securitytracker.com/id/1040831
https://0patch.blogspot.si/2018/02/two-interesting-micropatches-for-7-zip.html
https://github.com/p7zip-project/p7zip/issues/7
https://landave.io/2018/01/7-zip-multiple-memory-corruptions-via-rar-and-zip/ ExploitTechnical DescriptionThird Party Advisory
https://lists.debian.org/debian-lts-announce/2018/02/msg00003.html Mailing ListThird Party Advisory
https://usn.ubuntu.com/3913-1/
https://www.debian.org/security/2018/dsa-4104 Third Party Advisory
http://www.securitytracker.com/id/1040831
https://0patch.blogspot.si/2018/02/two-interesting-micropatches-for-7-zip.html
https://landave.io/2018/01/7-zip-multiple-memory-corruptions-via-rar-and-zip/ ExploitTechnical DescriptionThird Party Advisory
https://lists.debian.org/debian-lts-announce/2018/02/msg00003.html Mailing ListThird Party Advisory
https://usn.ubuntu.com/3913-1/
https://www.debian.org/security/2018/dsa-4104 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2017-17969), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.