What is CVE-2017-20006?

CVE-2017-20006 is a high-severity vulnerability in Linux Kernel, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2021-07-01.

How severe is CVE-2017-20006?

High severity. CVSS v3 base score is 7.8 out of 10.

Buffer overflow in Linux Kernel

CVE-2017-20006

UnRAR 5.6.1.2 and 5.6.1.3 has a heap-based buffer overflow in Unpack::CopyString (called from Unpack::Unpack5 and CmdExtract::ExtractCurrentFile).

Vulnerability class: Buffer Overflow

Published 2021-07-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.012 (67.5th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 67.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: -0.000

Affected products

Linux Kernel
Rarlab Unrar — versions 5.6.1.2, 5.6.1.3

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/google/oss-fuzz-vulns/blob/main/vulns/unrar/OSV-2017-104.yaml (Third Party Advisory)
bugs.chromium.org/p/oss-fuzz/issues/detail (Exploit, Patch, Third Party Advisory, Issue Tracking)
github.com/aawc/unrar/commit/0ff832d31470471803b175cfff4e40c1b08ee779 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2017-20006?: CVE-2017-20006 is a high-severity vulnerability in Linux Kernel, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2021-07-01.
How severe is CVE-2017-20006?: High severity. CVSS v3 base score is 7.8 out of 10.