What is CVE-2017-18043?

CVE-2017-18043 is a medium-severity vulnerability in Qemu, classified under Integer Overflow or Wraparound. CVSS score: 5.5/10. Published 2018-01-31.

How severe is CVE-2017-18043?

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

Integer overflow in Qemu

CVE-2017-18043

Integer overflow in the macro ROUND_UP (n, d) in Quick Emulator (Qemu) allows a user to cause a denial of service (Qemu process crash).

Vulnerability class: Integer Overflow

Published 2018-01-31 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (35.9th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Qemu
Canonical Ubuntu Linux — versions 14.04, 16.04, 17.10
Debian Linux — versions 9.0

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

lists.debian.org/debian-lts-announce/2018/09/msg00007.html (mailing-list, Third Party Advisory)
www.debian.org/security/2018/dsa-4213 (vendor-advisory, Third Party Advisory)
www.openwall.com/lists/oss-security/2018/01/19/1 (mailing-list, Mailing List, Third Party Advisory)
usn.ubuntu.com/3575-1/ (vendor-advisory, Third Party Advisory)
git.qemu.org/
www.securityfocus.com/bid/102759 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2017-18043?: CVE-2017-18043 is a medium-severity vulnerability in Qemu, classified under Integer Overflow or Wraparound. CVSS score: 5.5/10. Published 2018-01-31.
How severe is CVE-2017-18043?: Medium severity. CVSS v3 base score is 5.5 out of 10.