CVE-2015-1779

Publication date 25 March 2015

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
qemu	15.04 vivid	Fixed 1:2.2+dfsg-5expubuntu9.1
	14.10 utopic	Fixed 2.1+dfsg-4ubuntu6.6
	14.04 LTS trusty	Fixed 2.0.0+dfsg-2ubuntu1.11
	12.04 LTS precise	Not in release
	10.04 LTS lucid	Not in release
qemu-kvm	15.04 vivid	Not in release
	14.10 utopic	Not in release
	14.04 LTS trusty	Not in release
	12.04 LTS precise	Not affected
	10.04 LTS lucid	Not affected

Notes

sbeattie

websockets introduced in qemu 1.4

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
qemu	Upstream: http://git.qemu.org/?p=qemu.git;a=commit;h=a2bebfd6e09d285aa793cae3fb0fc3a39a9fee6e Upstream: http://git.qemu.org/?p=qemu.git;a=commit;h=2cdb5e142fb93e875fa53c52864ef5eb8d5d8b41

Severity score breakdown

Parameter	Value
Base score	8.6 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Changed
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-2608-1
QEMU vulnerabilities
13 May 2015