Wiz
Vulnerability DatabaseCVE-2019-20808

CVE-2019-20808: 
NixOS vulnerability analysis and mitigation

Overview

An out-of-bounds read vulnerability (CVE-2019-20808) was discovered in QEMU 4.1.0's ATI VGA implementation. The vulnerability was found in the ati_cursor_define() function while handling MMIO write operations through the ati_mm_write() callback. This vulnerability was introduced with QEMU version 4.0.0 when ATI VGA emulation support was added (RedHat Bugzilla).

Technical details

The vulnerability exists in the ATI VGA implementation within QEMU, specifically in the ati_cursor_define() function when processing MMIO write operations. The issue has been assigned a CVSS v3.1 score of 6.5 (MEDIUM) with the vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H (NetApp Advisory).

Impact

If successfully exploited, this vulnerability could allow a malicious guest to crash the QEMU process, resulting in a denial of service (DoS) condition (CVE Mitre).

Exploitability

The vulnerability requires local access with low complexity and low privileges to exploit. No user interaction is required for exploitation (NetApp Advisory).

Mitigation and workarounds

The vulnerability was fixed in QEMU version 4.2.0. A patch was released and is available through the upstream commit aab0e2a661b2b6bf7915c0aefe807fb60d6d9d13 (RedHat Bugzilla).

Additional resources

Source: This report was generated using AI

Related NixOS vulnerabilities:

CVE ID

Severity

Score

Technologies

Component name

CISA KEV exploit

Has fix

Published date

CVE-2026-75874CRITICAL10
  • NixOS logoNixOS
  • cpe:2.3:a:mozilla:firefox
NoYesAug 18, 2026
CVE-2026-74990CRITICAL9.8
  • NixOS logoNixOS
  • cpe:2.3:a:mozilla:firefox
NoYesAug 18, 2026
CVE-2026-74989CRITICAL9.8
  • NixOS logoNixOS
  • cpe:2.3:a:mozilla:firefox
NoYesAug 18, 2026
CVE-2026-74988CRITICAL9.8
  • NixOS logoNixOS
  • thunderbird
NoYesAug 18, 2026
CVE-2026-74987CRITICAL9.8
  • NixOS logoNixOS
  • MozillaFirefox-branding-upstream
NoYesAug 18, 2026

Free Vulnerability Assessment

Benchmark your Cloud Security Posture

Evaluate your cloud security practices across 9 security domains to benchmark your risk level and identify gaps in your defenses.

Request assessment

Additional Wiz resources

Cloud Vulnerability DB

Cloud Vulnerability DB

A community-led vulnerabilities database

Cloud Threat Landscape

Cloud Threat Landscape

A threat intelligence database

PEACH

PEACH

A tenant isolation framework

Get a personalized demo

Ready to see Wiz in action?

"Best User Experience I have ever seen, provides full visibility to cloud workloads."
David EstlickCISO
"Wiz provides a single pane of glass to see what is going on in our cloud environments."
Adam FletcherChief Security Officer
"We know that if Wiz identifies something as critical, it actually is."
Greg PoniatowskiHead of Threat and Vulnerability Management
Get a demo