CVE-2015-1779
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.
02 Description
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.
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 6.57% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 93.6% of scored records. A rank, not a probability.
- NVD base score
- 8.6 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2016-01-12 19:00Z10 YR AGO
- Last updated
- 2024-08-06 04:54Z2 YR AGO
- Reserved
- 2015-02-17
- Assigning CNA
- redhat
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- Data version
- 5.1
- Document digest
- 290260751221975b582139ede72da27037946e81fe35e98a8db1985307c4b8a3
05 Affected products
06 References
- lists.opensuse.orgSUSE-SU-2015:0870http://lists.opensuse.org/opensuse-security-announce/2015-05/msg00033.html
- lists.gnu.org[Qemu-devel] 20150323 [PATCH 1/2] CVE-2015-1779: incrementally decode websocket frameshttps://lists.gnu.org/archive/html/qemu-devel/2015-03/msg04896.html
- lists.fedoraproject.orgFEDORA-2015-5541http://lists.fedoraproject.org/pipermail/package-announce/2015-April/155196.html
- www.debian.orgDSA-3259http://www.debian.org/security/2015/dsa-3259
- www.openwall.com[oss-security] 20150409 Re: CVE-2015-1779 qemu: vnc: insufficient resource limiting in VNC websockets decoderhttp://www.openwall.com/lists/oss-security/2015/04/09/6
- lists.opensuse.orgSUSE-SU-2015:0896http://lists.opensuse.org/opensuse-security-announce/2015-05/msg00042.html
- lists.fedoraproject.orgFEDORA-2015-5482http://lists.fedoraproject.org/pipermail/package-announce/2015-April/154656.html
- lists.gnu.org[Qemu-devel] 20150323 [PATCH 0/2] CVE-2015-1779: fix denial of service in VNC websocketshttps://lists.gnu.org/archive/html/qemu-devel/2015-03/msg04894.html
- rhn.redhat.comRHSA-2015:1931http://rhn.redhat.com/errata/RHSA-2015-1931.html
- www.openwall.com[oss-security] 20150324 CVE-2015-1779 qemu: vnc: insufficient resource limiting in VNC websockets decoderhttp://www.openwall.com/lists/oss-security/2015/03/24/9
- www.securitytracker.com1033975http://www.securitytracker.com/id/1033975
- www.oracle.comhttp://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
- rhn.redhat.comRHSA-2015:1943http://rhn.redhat.com/errata/RHSA-2015-1943.html
- www.ubuntu.comUSN-2608-1http://www.ubuntu.com/usn/USN-2608-1
- lists.gnu.org[Qemu-devel] 20150323 [PATCH 2/2] CVE-2015-1779: limit size of HTTP headers from websockets clientshttps://lists.gnu.org/archive/html/qemu-devel/2015-03/msg04895.html
- www.securityfocus.com73303http://www.securityfocus.com/bid/73303
- security.gentoo.orgGLSA-201602-01https://security.gentoo.org/glsa/201602-01
07 Fixed in
Debian 12
- qemu Fixed in 1:2.3+dfsg-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- qemu Fixed in 1:2.3+dfsg-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- qemu Fixed in 1:2.3+dfsg-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 14.04 LTS
- qemu Fixed in 2.0.0+dfsg-2ubuntu1.11
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.