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Vulnerability record · CVE-2018-6307 · published 19 December 2018

CVE-2018-6307: Libvnc project libvncserver use after free vulnerability

LLibvnc Project · Libvncserver

LibVNC before commit ca2a5ac02fbbadd0a21fabba779c1ea69173d10b contains heap use-after-free vulnerability in server code of file transfer extension that can result remote code execution.

8.1 CVSS 3.0 High EPSS 27% · top 2.0% CWE-416 · Use after free
8.1CVSS 3.0 base score, v2 6.8
27%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
11References
17 Jun 2026Last modified by NVD

Description

LibVNC before commit ca2a5ac02fbbadd0a21fabba779c1ea69173d10b contains heap use-after-free vulnerability in server code of file transfer extension that can result remote code execution.

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

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

References

LinkTags
https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-026-libvnc-heap-use-after-free/ Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/12/msg00017.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
https://usn.ubuntu.com/3877-1/ Third Party Advisory
https://www.debian.org/security/2019/dsa-4383 Third Party Advisory
https://github.com/LibVNC/libvncserver/issues/241 Third Party Advisory
https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-026-libvnc-heap-use-after-free/ Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/12/msg00017.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
https://usn.ubuntu.com/3877-1/ Third Party Advisory
https://www.debian.org/security/2019/dsa-4383 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2018-6307), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.