What is CVE-2017-14121?

CVE-2017-14121 is a medium-severity vulnerability in Rarlab Unrar, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2017-09-03.

How severe is CVE-2017-14121?

Medium severity. CVSS v3 base score is 5.5 out of 10.

NULL pointer dereference in Rarlab Unrar

CVE-2017-14121

The DecodeNumber function in unrarlib.c in unrar 0.0.1 (aka unrar-free or unrar-gpl) suffers from a NULL pointer dereference flaw triggered by a crafted RAR archive. NOTE: this may be the same as one of the several test cases in the CVE-2017-11189 references.

Published 2017-09-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.011 (64.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 64.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Rarlab Unrar — versions 0.0.1
Debian Linux — versions 9.0

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

bugs.debian.org/874061 (Third Party Advisory, Issue Tracking)
www.openwall.com/lists/oss-security/2017/08/20/1 (Mailing List, Third Party Advisory)
lists.debian.org/debian-lts-announce/2021/02/msg00026.html (mailing-list, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2017-14121?: CVE-2017-14121 is a medium-severity vulnerability in Rarlab Unrar, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2017-09-03.
How severe is CVE-2017-14121?: Medium severity. CVSS v3 base score is 5.5 out of 10.