Skip to content
Fencer Intel
high 8.6

CVE-2015-1779 json

The VNC websocket frame decoder in QEMU allows remote attackers to cause a denial of service (memory and CPU consumption) via a large (1) w…

published 2016-01-12 10 y ago modified 2026-06-17 4 mo ago also EUVD-2015-1906

cvss
8.6
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
6.6%
EPSS 6.6% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

The VNC websocket frame decoder in QEMU allows remote attackers to cause a denial of service (memory and CPU consumption) via a large (1) websocket payload or (2) HTTP headers section.

Patch / fix

  • qemu Debian 14, Debian 13, Debian 12 1:2.3+dfsg-1

debian advisories DEBIAN-CVE-2015-1779

  • qemu Ubuntu 14.04 LTS 2.0.0+dfsg-2ubuntu1.11

ubuntu advisories UBUNTU-CVE-2015-1779

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • qemu-kvm-rhev RHEL 7 10:2.1.2-23.el7_1.10
  • qemu-img-rhev RHEL 7 10:2.1.2-23.el7_1.10
  • libcacard-rhev RHEL 7 10:2.1.2-23.el7_1.10
  • qemu-kvm-tools-rhev RHEL 7 10:2.1.2-23.el7_1.10
  • libcacard-devel-rhev RHEL 7 10:2.1.2-23.el7_1.10
  • libcacard-tools-rhev RHEL 7 10:2.1.2-23.el7_1.10
  • qemu-kvm-common-rhev RHEL 7 10:2.1.2-23.el7_1.10
  • qemu-kvm RHEL 7 10:1.5.3-86.el7_1.8

red hat advisories RHSA-2015:1931RHSA-2015:1943

  • kvm SLE Point of Sale 11 SP3 1.4.2-53.38.1
  • xen SLES for SAP 12, SLES 12, SLED 12 +1 more 4.4.4_02-22.19.1
  • xen SLES for SAP 11 SP4, SLES 11 SP4, SLED 11 SP4 +1 more 4.4.4_02-32.1
  • xen SLES for SAP 12 SP1, SLES 12 SP1, SLED 12 SP1 +1 more 4.5.2_06-7.1
  • qemu SLES for SAP 12, SLES 12, SLED 12 2.0.2-46.1
  • kvm SLES 11 SP4-LTSS 1.4.2-60.34.1

suse advisories SUSE-SU-2021:14706-1SUSE-SU-2021:14704-1SUSE-SU-2016:1318-1SUSE-SU-2016:0955-1SUSE-SU-2016:0873-1SUSE-SU-2015:0896-1

  • xen openSUSE Tumbleweed 4.7.0_12-1.3

opensuse advisories openSUSE-SU-2024:10196-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2015-1779 updated cvss 5.7

qemu: vnc: insufficient resource limiting in VNC websockets decoder

  • Red Hat Enterprise Linux OpenStack Platform 5 (Icehouse) qemu-kvm-rhev Red Hat Enterprise Linux OpenStack Platform 6 (Juno) qemu-kvm-rhev
    affected: no fix available
  • Red Hat Enterprise Linux Client (v. 7) qemu-img 1.5.3-86.el7_1.8, qemu-kvm 1.5.3-86.el7_1.8, libcacard 1.5.3-86.el7_1.8, qemu-kvm-tools 1.5.3-86.el7_1.8, qemu-kvm-common 1.5.3-86.el7_1.8 Red Hat Enterprise Linux Client Optional (v. 7) libcacard-tools 1.5.3-86.el7_1.8 Red Hat Enterprise Linux ComputeNode Optional (v. 7) qemu-img 1.5.3-86.el7_1.8, qemu-kvm 1.5.3-86.el7_1.8, libcacard 1.5.3-86.el7_1.8, qemu-kvm-tools 1.5.3-86.el7_1.8, libcacard-tools 1.5.3-86.el7_1.8, qemu-kvm-common 1.5.3-86.el7_1.8 Red Hat Enterprise Linux Server (v. 7) qemu-img 1.5.3-86.el7_1.8, qemu-kvm 1.5.3-86.el7_1.8, libcacard 1.5.3-86.el7_1.8, qemu-kvm-tools 1.5.3-86.el7_1.8, qemu-kvm-common 1.5.3-86.el7_1.8 Red Hat Enterprise Linux Server Optional (v. 7) libcacard 1.5.3-86.el7_1.8, libcacard-tools 1.5.3-86.el7_1.8 Red Hat Enterprise Linux Workstation (v. 7) qemu-img 1.5.3-86.el7_1.8, qemu-kvm 1.5.3-86.el7_1.8, libcacard 1.5.3-86.el7_1.8, qemu-kvm-tools 1.5.3-86.el7_1.8, qemu-kvm-common 1.5.3-86.el7_1.8
    +1 more products
    Red Hat Enterprise Linux Workstation Optional (v. 7) libcacard-tools 1.5.3-86.el7_1.8
    fixed: vendor fix RHSA-2015:1943
  • Red Hat RHEV-H and VDSM for 7 Hosts qemu-img-rhev 2.1.2-23.el7_1.10, qemu-kvm-rhev 2.1.2-23.el7_1.10, libcacard-rhev 2.1.2-23.el7_1.10, qemu-kvm-tools-rhev 2.1.2-23.el7_1.10, libcacard-devel-rhev 2.1.2-23.el7_1.10, libcacard-tools-rhev 2.1.2-23.el7_1.10, +1 more
    fixed: vendor fix RHSA-2015:1931
  • Red Hat Enterprise Linux 5 kvm Red Hat Enterprise Linux 6 qemu-img, qemu-kvm, qemu-kvm-tools, qemu-guest-agent, qemu-guest-agent-win32 Red Hat OpenStack Platform 4 qemu-kvm-rhev
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

6.57% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
NVD 2.0 7.8 AV:N/AC:L/Au:N/C:N/I:N/A:C

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.