CVE-2017-17969
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (4.99%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- 7.8 HIGHCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 4.99% probability · 92th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Affected
- 7-zip/7-zip · 7-zip/p7zip · debian/debian linux
- Source
- cve@mitre.org
EPSS moved from 7.5% on 21 September 2026 to 5.0% on 27 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
References
- 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/Exploit, Technical Description, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/02/msg00003.htmlMailing List, Third Party Advisory
- https://usn.ubuntu.com/3913-1/
- https://www.debian.org/security/2018/dsa-4104Third 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/Exploit, Technical Description, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/02/msg00003.htmlMailing List, Third Party Advisory
- https://usn.ubuntu.com/3913-1/
- https://www.debian.org/security/2018/dsa-4104Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.