What is CVE-2018-20125?

CVE-2018-20125 is a high-severity vulnerability in Qemu, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2018-12-20.

How severe is CVE-2018-20125?

High severity. CVSS v3 base score is 7.5 out of 10.

NULL pointer dereference in Qemu

CVE-2018-20125

hw/rdma/vmw/pvrdma_cmd.c in QEMU allows attackers to cause a denial of service (NULL pointer dereference or excessive memory allocation) in create_cq_ring or create_qp_rings.

Published 2018-12-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.037 (89.3th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 89.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.037 · newest: 0.037 · change: 0.000

Affected products

Qemu
Canonical Ubuntu Linux — versions 14.04, 16.04, 18.04

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

www.openwall.com/lists/oss-security/2018/12/19/3 (mailing-list, Patch, Mailing List, Third Party Advisory)
www.securityfocus.com/bid/106298 (VDB Entry, Third Party Advisory, vdb-entry)
lists.gnu.org/archive/html/qemu-devel/2018-12/msg02823.html (mailing-list, Patch, Mailing List, Third Party Advisory)
usn.ubuntu.com/3923-1/ (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2018-20125?: CVE-2018-20125 is a high-severity vulnerability in Qemu, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2018-12-20.
How severe is CVE-2018-20125?: High severity. CVSS v3 base score is 7.5 out of 10.