CVE-2016-9603
MEDIUMCVSS 5.5/10EPSS 4.45%
Last modified
CVE-2016-9603 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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.. EPSS estimates a 4.45% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.0/AV:A/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Qemu | Qemu | < 2.9.0 | — |
| Citrix | Xenserver | 6.0.2 | — |
| Citrix | Xenserver | 6.2.0 | Sp1 |
| Citrix | Xenserver | 6.5 | Sp1 |
| Citrix | Xenserver | 7.0 | — |
| Citrix | Xenserver | 7.1 | — |
| Redhat | Openstack | 5.0 | — |
| Redhat | Openstack | 6.0 | — |
| Redhat | Openstack | 7.0 | — |
| Redhat | Openstack | 8 | — |
| Redhat | Openstack | 9 | — |
| Redhat | Openstack | 10 | — |
| Debian | Debian Linux | 7.0 | — |
| Redhat | Enterprise Linux Desktop | 6.0 | — |
| Redhat | Enterprise Linux Desktop | 7.0 | — |
| Redhat | Enterprise Linux Server | 6.0 | — |
| Redhat | Enterprise Linux Server | 7.0 | — |
| Redhat | Enterprise Linux Server Aus | 7.3 | — |
| Redhat | Enterprise Linux Server Aus | 7.4 | — |
| Redhat | Enterprise Linux Server Eus | 7.3 | — |
| Redhat | Enterprise Linux Server Eus | 7.4 | — |
| Redhat | Enterprise Linux Server Eus | 7.5 | — |
| Redhat | Enterprise Linux Workstation | 6.0 | — |
| Redhat | Enterprise Linux Workstation | 7.0 | — |
References
- http://www.securityfocus.com/bid/96893Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1038023Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2017:0980Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:0981Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:0982Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:0983Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:0984Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:0985Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:0987Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:0988Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:1205Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:1206Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:1441Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-9603Issue Tracking, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/02/msg00005.htmlThird Party Advisory
- https://security.gentoo.org/glsa/201706-03Third Party Advisory
- https://support.citrix.com/article/CTX221578Third Party Advisory
- http://www.securityfocus.com/bid/96893Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1038023Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2017:0980Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:0981Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:0982Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:0983Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:0984Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:0985Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:0987Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:0988Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:1205Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:1206Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:1441Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-9603Issue Tracking, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/02/msg00005.htmlThird Party Advisory
- https://security.gentoo.org/glsa/201706-03Third Party Advisory
- https://support.citrix.com/article/CTX221578Third Party Advisory
Timeline
- Published
- Last Modified
- 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.
How severe is CVE-2016-9603?
CVE-2016-9603 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 4.45% probability of exploitation in the next 30 days.
How do I fix CVE-2016-9603?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
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