CVE-2014-6053

Severity: medium (CVSS 5.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 7.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2014-12-15 · updated 2026-06-17
Weakness: CWE-19

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.

Affected products

Canonical Ubuntu Linux: 12.04, 14.04
Debian Linux: 7.0
Libvncserver: through 0.9.9

References

http://lists.opensuse.org/opensuse-updates/2015-12/msg00022.html
http://seclists.org/oss-sec/2014/q3/639
http://secunia.com/advisories/61506
http://secunia.com/advisories/61682
http://ubuntu.com/usn/usn-2365-1
http://www.debian.org/security/2014/dsa-3081
http://www.ocert.org/advisories/ocert-2014-007.html
http://www.openwall.com/lists/oss-security/2014/09/25/11
https://github.com/newsoft/libvncserver/commit/6037a9074d52b1963c97cb28ea1096c7c14cbf28
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

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