CVE-2016-9603
published 2018-07-27CVE-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…
PriorityP359critical9.9CVSS 3.0
AVNACLPRLUINSCCHIHAH
EPSS
4.45%
90.3th percentile
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.
Affected
44 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| citrix | citrix_adm | — | — |
| citrix | citrix_hypervisor | — | — |
| citrix | citrix_virtual_apps_and_desktops | — | — |
| citrix | endpoint_management | — | — |
| citrix | netscaler_adc | — | — |
| citrix | netscaler_gateway | — | — |
| citrix | xenserver | — | — |
| citrix | xenserver | — | — |
| citrix | xenserver | — | — |
| citrix | xenserver | — | — |
| citrix | xenserver | — | — |
| citrix | xenserver | — | — |
| debian | debian_linux | — | — |
| debian | qemu | < qemu 1:2.8+dfsg-4 (bookworm) | qemu 1:2.8+dfsg-4 (bookworm) |
| debian | xen | < qemu 1:2.8+dfsg-4 (bookworm) | qemu 1:2.8+dfsg-4 (bookworm) |
| qemu | qemu | < 2.9.0 | 2.9.0 |
| qemu | qemu | — | — |
| qemu | qemu | >= 0 < 1:2.8+dfsg-4 | 1:2.8+dfsg-4 |
| qemu | qemu | >= 0 < 1:2.8+dfsg-4 | 1:2.8+dfsg-4 |
| qemu | qemu | >= 0 < 1:2.8+dfsg-4 | 1:2.8+dfsg-4 |
| qemu | qemu | >= 0 < 1:2.8+dfsg-4 | 1:2.8+dfsg-4 |
| qemu | qemu | >= 0 < 2.0.0+dfsg-2ubuntu1.33 | 2.0.0+dfsg-2ubuntu1.33 |
| qemu | qemu | >= 0 < 1:2.5+dfsg-5ubuntu10.11 | 1:2.5+dfsg-5ubuntu10.11 |
| redhat | enterprise_linux_desktop | — | — |
| redhat | enterprise_linux_desktop | — | — |
CVSS provenance
nvdv3.09.9CRITICALCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
nvdv2.09.0CRITICALAV:N/AC:L/Au:S/C:C/I:C/A:C
osv9.9CRITICAL
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
vendor_ubuntu5.5MEDIUM
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
Ubuntu
QEMU vulnerabilities
vendor_ubuntu·2017-04-25·CVSS 5.5
CVE-2016-10028 [MEDIUM] QEMU vulnerabilities
Title: QEMU vulnerabilities
Summary: Several security issues were fixed in QEMU.
Zhenhao Hong discovered that QEMU incorrectly handled the Virtio GPU
device. An attacker inside the guest could use this issue to cause QEMU to
crash, resulting in a denial of service. (CVE-2016-10028)
It was discovered that QEMU incorrectly handled the JAZZ RC4030 device. A
privileged attacker inside the guest could use this issue to cause QEMU to
crash, resulting in a denial of service. (CVE-2016-8667)
Jann Horn discovered that QEMU incorrectly handled VirtFS directory
sharing. A privileged attacker inside the guest could use this issue to
access files on the host file system outside of the shared directory and
possibly escalate their privileges. In the default installation, when QEMU
is used with libvir
Ubuntu
QEMU vulnerabilities
vendor_ubuntu·2017-04-20·CVSS 5.5
CVE-2016-10028 [MEDIUM] QEMU vulnerabilities
Title: QEMU vulnerabilities
Summary: Several security issues were fixed in QEMU.
Zhenhao Hong discovered that QEMU incorrectly handled the Virtio GPU
device. An attacker inside the guest could use this issue to cause QEMU to
crash, resulting in a denial of service. This issue only affected Ubuntu
16.04 LTS and Ubuntu 16.10. (CVE-2016-10028, CVE-2016-10029)
Li Qiang discovered that QEMU incorrectly handled the 6300esb watchdog. A
privileged attacker inside the guest could use this issue to cause QEMU to
crash, resulting in a denial of service. (CVE-2016-10155)
Li Qiang discovered that QEMU incorrectly handled the i.MX Fast Ethernet
Controller. A privileged attacker inside the guest could use this issue to
cause QEMU to crash, resulting in a denial of service. This issue only
affected Ub
Red Hat
Qemu: cirrus: heap buffer overflow via vnc connection
vendor_redhat·2017-03-14·CVSS 5.5
CVE-2016-9603 [MEDIUM] CWE-122 Qemu: cirrus: heap buffer overflow via vnc connection
Qemu: cirrus: heap buffer overflow via vnc connection
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.
A heap buffer overflow flaw was found in QEMU's Cirrus CLGD 54xx VGA emulator's VNC display driver support; 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,
Debian
CVE-2016-9603: qemu - A heap buffer overflow flaw was found in QEMU's Cirrus CLGD 54xx VGA emulator's ...
vendor_debian·2016·CVSS 5.5
CVE-2016-9603 [MEDIUM] CVE-2016-9603: qemu - A heap buffer overflow flaw was found in QEMU's Cirrus CLGD 54xx VGA emulator's ...
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.
Scope: local
bookworm: resolved (fixed in 1:2.8+dfsg-4)
bullseye: resolved (fixed in 1:2.8+dfsg-4)
forky: resolved (fixed in 1:2.8+dfsg-4)
sid: resolved (fixed in 1:2.8+dfsg-4)
trixie: resolved (fixed in 1:2.8+dfsg-4)
Citrix
Citrix Security Bulletin CTX221578
vendor_citrix·CVSS 9.9
CVE-2016-9603 [CRITICAL] Citrix Security Bulletin CTX221578
Citrix Security Bulletin CTX221578
CVE References: CVE-2016-9603, CVE-2025-12101, CVE-2025-62626, CVE-2026-23554, CVE-2026-3055, CVE-2026-4368, CVE-2026-4397
Affected Products: Citrix ADM, Citrix Hypervisor, Citrix Virtual Apps and Desktops, Endpoint Management, NetScaler ADC, NetScaler Gateway, XenServer
GHSA
GHSA-49mx-v59p-m55m: A heap buffer overflow flaw was found in QEMU's Cirrus CLGD 54xx VGA emulator's VNC display driver support before 2
ghsa_unreviewed·2022-05-13
CVE-2016-9603 [CRITICAL] CWE-119 GHSA-49mx-v59p-m55m: A heap buffer overflow flaw was found in QEMU's Cirrus CLGD 54xx VGA emulator's VNC display driver support before 2
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.
OSV
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
osv·2018-07-27·CVSS 9.9
CVE-2016-9603 [CRITICAL] 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
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.
OSV
qemu vulnerabilities
osv·2017-04-20·CVSS 5.5
CVE-2016-10028 [MEDIUM] qemu vulnerabilities
qemu vulnerabilities
Zhenhao Hong discovered that QEMU incorrectly handled the Virtio GPU
device. An attacker inside the guest could use this issue to cause QEMU to
crash, resulting in a denial of service. This issue only affected Ubuntu
16.04 LTS and Ubuntu 16.10. (CVE-2016-10028, CVE-2016-10029)
Li Qiang discovered that QEMU incorrectly handled the 6300esb watchdog. A
privileged attacker inside the guest could use this issue to cause QEMU to
crash, resulting in a denial of service. (CVE-2016-10155)
Li Qiang discovered that QEMU incorrectly handled the i.MX Fast Ethernet
Controller. A privileged attacker inside the guest could use this issue to
cause QEMU to crash, resulting in a denial of service. This issue only
affected Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2016-7907)
It was disc
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2016-9603 Qemu: cirrus: heap buffer overflow via vnc connection [fedora-all]
bugzilla·2017-03-14·CVSS 5.5
CVE-2016-9603 [MEDIUM] CVE-2016-9603 Qemu: cirrus: heap buffer overflow via vnc connection [fedora-all]
CVE-2016-9603 Qemu: cirrus: heap buffer overflow via vnc connection [fedora-all]
This is an automatically created tracking bug! It was created to ensure
that one or more security vulnerabilities are fixed in affected versions
of Fedora.
For comments that are specific to the vulnerability please use bugs filed
against the "Security Response" product referenced in the "Blocks" field.
For more information see:
http://fedoraproject.org/wiki/Security/TrackingBugs
When submitting as an update, use the fedpkg template provided in the next
comment(s). This will include the bug IDs of this tracking bug as well as
the relevant top-level CVE bugs.
Please also mention the CVE IDs being fixed in the RPM changelog and the
fedpkg commit message.
NOTE: this issue affects multiple supported versions
Bugzilla
CVE-2016-9603 xen: Qemu: cirrus: heap buffer overflow via vnc connection [fedora-all]
bugzilla·2017-03-14·CVSS 5.5
CVE-2016-9603 [MEDIUM] CVE-2016-9603 xen: Qemu: cirrus: heap buffer overflow via vnc connection [fedora-all]
CVE-2016-9603 xen: Qemu: cirrus: heap buffer overflow via vnc connection [fedora-all]
This is an automatically created tracking bug! It was created to ensure
that one or more security vulnerabilities are fixed in affected versions
of Fedora.
For comments that are specific to the vulnerability please use bugs filed
against the "Security Response" product referenced in the "Blocks" field.
For more information see:
http://fedoraproject.org/wiki/Security/TrackingBugs
When submitting as an update, use the fedpkg template provided in the next
comment(s). This will include the bug IDs of this tracking bug as well as
the relevant top-level CVE bugs.
Please also mention the CVE IDs being fixed in the RPM changelog and the
fedpkg commit message.
NOTE: this issue affects multiple supported vers
Bugzilla
CVE-2016-9603 Qemu: cirrus: heap buffer overflow via vnc connection
bugzilla·2017-03-07·CVSS 5.5
CVE-2016-9603 [MEDIUM] CVE-2016-9603 Qemu: cirrus: heap buffer overflow via vnc connection
CVE-2016-9603 Qemu: cirrus: heap buffer overflow via vnc connection
Quick Emulator(Qemu) built with the Cirrus CLGD 54xx VGA Emulator and the
VNC display driver support is vulnerable to a heap buffer overflow issue.
It could occur when Vnc client attempts to update its display after a vga
operation is performed by a guest.
A privileged user/process inside guest could use this flaw to crash the Qemu
process resulting in DoS OR potentially leverage it to execute arbitrary code
on the host with privileges of the Qemu process.
Reference:
-> http://www.openwall.com/lists/oss-security/2017/03/14/2
Discussion:
Created attachment 1260925
Proposed upstream patch
---
Created xen tracking bugs for this issue:
Affects: fedora-all [bug 1432041]
---
Created qemu tracking bugs for this issue:
http://www.securityfocus.com/bid/96893http://www.securitytracker.com/id/1038023https://access.redhat.com/errata/RHSA-2017:0980https://access.redhat.com/errata/RHSA-2017:0981https://access.redhat.com/errata/RHSA-2017:0982https://access.redhat.com/errata/RHSA-2017:0983https://access.redhat.com/errata/RHSA-2017:0984https://access.redhat.com/errata/RHSA-2017:0985https://access.redhat.com/errata/RHSA-2017:0987https://access.redhat.com/errata/RHSA-2017:0988https://access.redhat.com/errata/RHSA-2017:1205https://access.redhat.com/errata/RHSA-2017:1206https://access.redhat.com/errata/RHSA-2017:1441https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-9603https://lists.debian.org/debian-lts-announce/2018/02/msg00005.htmlhttps://lists.debian.org/debian-lts-announce/2018/09/msg00007.htmlhttps://security.gentoo.org/glsa/201706-03https://support.citrix.com/article/CTX221578http://www.securityfocus.com/bid/96893http://www.securitytracker.com/id/1038023https://access.redhat.com/errata/RHSA-2017:0980https://access.redhat.com/errata/RHSA-2017:0981https://access.redhat.com/errata/RHSA-2017:0982https://access.redhat.com/errata/RHSA-2017:0983https://access.redhat.com/errata/RHSA-2017:0984https://access.redhat.com/errata/RHSA-2017:0985https://access.redhat.com/errata/RHSA-2017:0987https://access.redhat.com/errata/RHSA-2017:0988https://access.redhat.com/errata/RHSA-2017:1205https://access.redhat.com/errata/RHSA-2017:1206https://access.redhat.com/errata/RHSA-2017:1441https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-9603https://lists.debian.org/debian-lts-announce/2018/02/msg00005.htmlhttps://lists.debian.org/debian-lts-announce/2018/09/msg00007.htmlhttps://security.gentoo.org/glsa/201706-03https://support.citrix.com/article/CTX221578
2018-07-27
Published