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Vulnerability record · CVE-2014-6053 · published 15 December 2014

CVE-2014-6053: Libvncserver vulnerability

LLibvncserver · Libvncserver

The rfbProcessClientNormalMessage function in libvncserver/rfbserver.c in LibVNCServer 0.9.9 and earlier does not properly handle attempts to send a large amount of ClientCutText data, which allows remote attackers to cause a denial of service (memory consumption or daemon crash) via a crafted message that is processed by using a single unchecked malloc.

5.0 CVSS 2.0 Medium EPSS 7.3% · top 5.9% CWE-19 · CWE-19
5.0CVSS 2.0 base score
7.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
30References
17 Jun 2026Last modified by NVD

Description

The rfbProcessClientNormalMessage function in libvncserver/rfbserver.c in LibVNCServer 0.9.9 and earlier does not properly handle attempts to send a large amount of ClientCutText data, which allows remote attackers to cause a denial of service (memory consumption or daemon crash) via a crafted message that is processed by using a single unchecked malloc.

AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-updates/2015-12/msg00022.html
http://seclists.org/oss-sec/2014/q3/639 Mailing ListThird Party Advisory
http://secunia.com/advisories/61506
http://secunia.com/advisories/61682
http://ubuntu.com/usn/usn-2365-1 Third Party Advisory
http://www.debian.org/security/2014/dsa-3081 Third Party Advisory
http://www.ocert.org/advisories/ocert-2014-007.html Third Party AdvisoryUS Government Resource
http://www.openwall.com/lists/oss-security/2014/09/25/11 Mailing ListThird Party Advisory
https://github.com/newsoft/libvncserver/commit/6037a9074d52b1963c97cb28ea1096c7c14cbf28 Issue TrackingPatch
https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
https://lists.debian.org/debian-lts-announce/2019/11/msg00032.html
https://lists.debian.org/debian-lts-announce/2019/12/msg00028.html
https://security.gentoo.org/glsa/201507-07
https://usn.ubuntu.com/4573-1/
https://usn.ubuntu.com/4587-1/
http://lists.opensuse.org/opensuse-updates/2015-12/msg00022.html
http://seclists.org/oss-sec/2014/q3/639 Mailing ListThird Party Advisory
http://secunia.com/advisories/61506
http://secunia.com/advisories/61682
http://ubuntu.com/usn/usn-2365-1 Third Party Advisory
http://www.debian.org/security/2014/dsa-3081 Third Party Advisory
http://www.ocert.org/advisories/ocert-2014-007.html Third Party AdvisoryUS Government Resource
http://www.openwall.com/lists/oss-security/2014/09/25/11 Mailing ListThird Party Advisory
https://github.com/newsoft/libvncserver/commit/6037a9074d52b1963c97cb28ea1096c7c14cbf28 Issue TrackingPatch
https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
https://lists.debian.org/debian-lts-announce/2019/11/msg00032.html
https://lists.debian.org/debian-lts-announce/2019/12/msg00028.html
https://security.gentoo.org/glsa/201507-07
https://usn.ubuntu.com/4573-1/
https://usn.ubuntu.com/4587-1/

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Source: NIST National Vulnerability Database (record CVE-2014-6053), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.