CVE-2020-13791

Host emulator crash via unchecked PCI read

Published Jun 4, 2020 · Updated Aug 4, 2024

Out-of-bounds read in QEMU 4.2.0 ATI VGA emulation allows guest OS users to crash the host QEMU process through PCI configuration access. The ati_mm_read routine passes an end-of-space address and request size to pci_default_read_config without first verifying that the complete read remains within PCI configuration space. The guest must be able to issue memory-mapped reads through emulated ATI VGA hardware; a successful trigger terminates the host emulator and interrupts the virtual machine.

CVSS severity5.5
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in QEMU 4.2.0 ATI VGA emulation allows guest OS users to crash the host QEMU process through PCI configuration access. The ati_mm_read routine passes an end-of-space address and request size to pci_default_read_config without first verifying that the complete read remains within PCI configuration space. The guest must be able to issue memory-mapped reads through emulated ATI VGA hardware; a successful trigger terminates the host emulator and interrupts the virtual machine.

The record

CVE
CVE-2020-13791
Published
Jun 4, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-125, T1499.004
Attack vector
local
Privileges
Unavailable

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 privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

2.1NIST NVDAV:L/AC:L/Au:N/C:N/I:N/A:P
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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