CVE-2018-6307

Name: CVE-2018-6307
Creator: NVD / NIST
Published: 2018-12-19T16:29:00.593+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 26.54%

Last modified Jun 17, 2026

CVE-2018-6307 is a vulnerability of currently unknown severity. LibVNC before commit ca2a5ac02fbbadd0a21fabba779c1ea69173d10b contains heap use-after-free vulnerability in server code of file transfer extension that can result remote code execution.. EPSS estimates a 26.54% chance of exploitation in the next 30 days.

Description

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

Metrics

EPSS Probability

26.54%

97.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-416

Affected Software

Vendor	Product	Versions
Libvnc Project	Libvncserver	< 0.9.12
Canonical	Ubuntu Linux	14.04
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	18.04
Canonical	Ubuntu Linux	18.10
Debian	Debian Linux	8.0
Debian	Debian Linux	9.0

References

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.htmlMailing List, Third 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-4383Third Party Advisory
https://github.com/LibVNC/libvncserver/issues/241Third 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.htmlMailing List, Third 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-4383Third Party Advisory

Timeline

Published: Dec 19, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-6307?

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

How severe is CVE-2018-6307?

Severity scoring for CVE-2018-6307 is pending analysis. The EPSS model estimates a 26.54% probability of exploitation in the next 30 days.

How do I fix CVE-2018-6307?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-6307?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST