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Fencer Vulns
high 7.5

CVE-2020-29260 json

libvncclient v0.9.13 was discovered to contain a memory leak via the function rfbClientCleanup().

published 2022-09-02 4 y ago modified 2026-06-17 4 mo ago also EUVD-2020-21635

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 66%
public exploits
0
none known

Summary

libvncclient v0.9.13 was discovered to contain a memory leak via the function rfbClientCleanup().

Patch / fix

  • libvncserver Debian 14, Debian 13, Debian 12 0.9.13+dfsg-5

debian advisories DEBIAN-CVE-2020-29260

  • libvncserver Ubuntu 22.04 LTS 0.9.13+dfsg-3ubuntu0.1

ubuntu advisories UBUNTU-CVE-2020-29260

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • LibVNCServer SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 0.9.9-17.41.1
  • LibVNCServer SLE Workstation Extension 15 SP3, SLE Module for Package Hub 15 SP4, SLE Module for Package Hub 15 SP3 +2 more 0.9.10-150000.4.29.1
  • LibVNCServer SLE Workstation Extension 15 SP4, SLE Module for Package Hub 15 SP4, openSUSE Leap 15.4 0.9.13-150400.3.3.1

suse advisories SUSE-SU-2022:4330-1SUSE-SU-2022:3990-1SUSE-SU-2022:3540-1

  • libvncserver Alpine 3.24, Alpine 3.23, Alpine 3.22 +5 more 0.9.13-r5

alpine advisories ALPINE-CVE-2020-29260

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-29260 updated cvss 7.5

libvncserver: a memory leak via the function rfbClientCleanup() may lead to a DoS

  • Red Hat Enterprise Linux 6 libvncserver
    affected: no fix available
  • Red Hat Enterprise Linux 7 libvncserver Red Hat Enterprise Linux 8 libvncserver
    affected: no fix planned “Will not fix”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.13% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.