What is CVE-2018-20532?

CVE-2018-20532 is a medium-severity vulnerability in Canonical Ubuntu Linux, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2018-12-28.

How severe is CVE-2018-20532?

Medium severity. CVSS v3 base score is 6.5 out of 10.

NULL pointer dereference in Canonical Ubuntu Linux

CVE-2018-20532

There is a NULL pointer dereference at ext/testcase.c (function testcase_read) in libsolvext.a in libsolv through 0.7.2 that will cause a denial of service.

Published 2018-12-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.021 (81.4th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 81.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.021 · newest: 0.021 · change: 0.000

Affected products

Canonical Ubuntu Linux — versions 18.10
openSUSE Libsolv

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

github.com/openSUSE/libsolv/pull/291 (Patch, Third Party Advisory)
bugzilla.redhat.com/show_bug.cgi (Exploit, Issue Tracking)
usn.ubuntu.com/3916-1/ (vendor-advisory, Third Party Advisory)
access.redhat.com/errata/RHSA-2019:2290 (vendor-advisory)
lists.opensuse.org/opensuse-security-announce/2019-08/msg00057.html (vendor-advisory)

Frequently asked questions

What is CVE-2018-20532?: CVE-2018-20532 is a medium-severity vulnerability in Canonical Ubuntu Linux, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2018-12-28.
How severe is CVE-2018-20532?: Medium severity. CVSS v3 base score is 6.5 out of 10.