What is CVE-2017-2633?

CVE-2017-2633 is a medium-severity vulnerability in Qemu, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.4/10. Published 2018-07-27.

How severe is CVE-2017-2633?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Is CVE-2017-2633 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Qemu

CVE-2017-2633

An out-of-bounds memory access issue was found in Quick Emulator (QEMU) before 1.7.2 in the VNC display driver. This flaw could occur while refreshing the VNC display surface area in the 'vnc_refresh_server_surface'. A user inside a guest could use this flaw to crash the QEMU process.

Vulnerability class: Buffer Overflow

Published 2018-07-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:L.

EPSS exploit prediction

EPSS: 0.030 (87.0th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 87.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.030 · newest: 0.030 · change: 0.000

Affected products

Qemu
Qemu Qemu: — versions 1.7.2
Red Hat Enterprise Linux Desktop — versions 6.0, 7.0
Red Hat Enterprise Linux Server — versions 6.0, 7.0
Red Hat Enterprise Linux Server Aus — versions 7.4
Red Hat Enterprise Linux Server Eus — versions 7.4, 7.5
Red Hat Enterprise Linux Workstation — versions 6.0, 7.0

Weakness classification (CWE)

Public proof-of-concept exploits

pawan-shivarkar/List-of-CVE-s-

References

www.openwall.com/lists/oss-security/2017/02/23/1 (mailing-list, Patch, Mailing List, Third Party Advisory)
git.qemu.org/
access.redhat.com/errata/RHSA-2017:1206 (vendor-advisory, Third Party Advisory)
git.qemu.org/
bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
access.redhat.com/errata/RHSA-2017:1441 (vendor-advisory, Third Party Advisory)
www.securityfocus.com/bid/96417 (VDB Entry, Third Party Advisory, vdb-entry)
access.redhat.com/errata/RHSA-2017:1856 (vendor-advisory, Third Party Advisory)
access.redhat.com/errata/RHSA-2017:1205 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2017-2633?: CVE-2017-2633 is a medium-severity vulnerability in Qemu, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.4/10. Published 2018-07-27.
How severe is CVE-2017-2633?: Medium severity. CVSS v3 base score is 5.4 out of 10.
Is CVE-2017-2633 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.