CVE-2020-13800

Guest-triggered process crash via recursive MMIO access

Published Jun 4, 2020 · Updated Aug 4, 2024

Uncontrolled recursion in QEMU 4.2.0 ATI VGA emulation allows guest OS users to crash the QEMU process through crafted MMIO access. The ati_mm_read and ati_mm_write handlers recurse on MM_DATA accesses without first rejecting MM_INDEX values at or below MM_DATA + 3. A guest able to access the emulated ATI VGA registers can exhaust the QEMU process stack, interrupting that virtual machine without reported host-code execution.

CVSS severity6.0
Medium
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled recursion in QEMU 4.2.0 ATI VGA emulation allows guest OS users to crash the QEMU process through crafted MMIO access. The ati_mm_read and ati_mm_write handlers recurse on MM_DATA accesses without first rejecting MM_INDEX values at or below MM_DATA + 3. A guest able to access the emulated ATI VGA registers can exhaust the QEMU process stack, interrupting that virtual machine without reported host-code execution.

The record

CVE
CVE-2020-13800
Published
Jun 4, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-674, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 4, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.9NIST NVDAV:L/AC:L/Au:N/C:N/I:N/A:C
6.0NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-674Uncontrolled Recursion
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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