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No exploitation reported

CVE-2016-9603

No exploitation reported by the sources we read.

  • Published2018-07-27
  • WeaknessCWE-119 · CWE-122

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A heap buffer overflow flaw was found in QEMU's Cirrus CLGD 54xx VGA emulator's VNC display driver support before 2.9; the issue could occur when a VNC client attempted to update its display after a VGA operation is performed by a guest. A privileged user/process inside a guest could use this flaw to crash the QEMU process or, potentially, execute arbitrary code on the host with privileges of the QEMU process.

Timeline

dates in UTC
  1. 2018-07-2721:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2016-9603?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2016-9603?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Redhat openstack
BranchAffectedFixed in
5.0= 5.0no fix published
6.0= 6.0no fix published
7.0= 7.0no fix published
8.x= 8no fix published
9.x= 9no fix published
10.x= 10no fix published
Citrix xenserver
BranchAffectedFixed in
6.0= 6.0.2no fix published
6.2= 6.2.0no fix published
6.5= 6.5no fix published
7.0= 7.0no fix published
7.1= 7.1no fix published
Redhat enterprise linux server eus
BranchAffectedFixed in
7.3= 7.3no fix published
7.4= 7.4no fix published
7.5= 7.5no fix published

6 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • CNACVSS 3.05.5read 2026-10-23
  • NVDCVSS 3.09.9read 2026-10-23
  • NVDCVSS 2.09read 2026-10-23
  • CNAweakness (CWE)CWE-122read 2026-10-23
  • NVDweakness (CWE)CWE-119read 2026-10-23
  • FIRST EPSSEPSS score4.4 %2026-10-22

Technical details

CVSS v3 Vector
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
2018-07-27
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2016-9603?

A heap buffer overflow flaw was found in QEMU's Cirrus CLGD 54xx VGA emulator's VNC display driver support before 2.9; the issue could occur when a VNC client attempted to update its display after a VGA operation is performed by a guest. A privileged user/process inside a guest could use this flaw to crash the QEMU process or, potentially, execute arbitrary code on the host with privileges of the QEMU process.

Is CVE-2016-9603 actively exploited?

Active exploitation of CVE-2016-9603 has not been confirmed. Its EPSS score was 4.4% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2016-9603?

CVE-2016-9603 has a CVSS v3 base score of 9.9 (CRITICAL severity), with vector string CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

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