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.
Conclusion & alert: CVE-2014-6053 is rated Moderate Risk (47.8/100): CVSS Medium severity, with high exploitation likelihood (EPSS 7.56%, 94th percentile). Core evidence: EPSS ranks this CVE among the most likely to be exploited in the near term. Mandatory action: High exploitation likelihood—assess exposure and prioritize remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 36.86% | 7.56% | -29.30% |
| 2 | 2025-07-13 | 40.51% | 36.86% | -3.65% |
| 3 | 2025-04-08 | — | 40.51% | — |
Full EPSS history (13 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 5.0 | 2.0 | MEDIUM |
|
10.0 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2014-6053 not yet assigned priority: Debian including 3 source packages (libvncserver, tightvnc, vino), 12 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 12. | https://security-tracker.debian.org/tracker/CVE-2014-6053 |
gentoo
|
normal | CVE-2014-6053: 1 GLSA(s) (201507-07), 1 atom(s) (net-libs/libvncserver); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2014-6053 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2014-6053 |
ubuntu
|
medium | CVE-2014-6053 medium priority: Ubuntu including 5 source packages (italc, krfb, libvncserver, tightvnc, vino), 84 status rows across 18 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lucid, lunar, mantic, noble, oracular, plucky, precise, questing, trusty, upstream, xenial): not-affected 29, released 20, DNE 16, needs-triage 10, ignored 9. | https://ubuntu.com/security/CVE-2014-6053 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| libvncserver | libvncserver | <= 0.9.9 | cpe:2.3:a:libvncserver:libvncserver:*:*:*:*:*:*:*:* |
| canonical | ubuntu_linux | 12.04 | cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:* |
| canonical | ubuntu_linux | 14.04 | cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* |
| debian | debian_linux | 7.0 | cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:* |
| URL | Tags |
|---|---|
| http://lists.opensuse.org/opensuse-updates/2015-12/msg00022.html | |
| http://seclists.org/oss-sec/2014/q3/639 | Mailing List Third 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 Advisory US Government Resource |
| http://www.openwall.com/lists/oss-security/2014/09/25/11 | Mailing List Third Party Advisory |
| https://github.com/newsoft/libvncserver/commit/6037a9074d52b1963c97cb28ea1096c7c14cbf28 | Issue Tracking Patch |
| 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/ |