CVE-2011-1751

What it is

The pciej_write function in hw/acpi_piix4.c in the PIIX4 Power Management emulation in qemu-kvm does not check if a device is hotpluggable before unplugging the PCI-ISA bridge, which allows privileged guest users to cause a denial of service (guest crash) and possibly execute arbitrary code by sending a crafted value to the 0xae08 (PCI_EJ_BASE) I/O port, which leads to a use-after-free related to "active qemu timers."

At a glance

Exploitability

Can be exploited from the same network segment with a login. High risk of data exposure, data tampering, service disruption.

Exploit odds

0.7% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2012-06-21 15:55 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 23:29 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.7% in the next 30 days (EPSS).
• Severity: 7.4 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2012-06-21 15:55 UTC

Last modified

2026-06-16 23:29 UTC

Exploit probability

0.7% · EPSS, next 30 days

Weakness

CWE-20 · Improper input validation

Record status

Modified

Affected

• Qemu 0.1.0
• Qemu 0.1.1
• Qemu 0.1.2
• Qemu 0.1.3
• Qemu 0.1.4
• Qemu 0.1.5
• Qemu 0.1.6
• Qemu 0.2.0

Attack profile CVSS 2.0 · 7.4

Attack vector

Adjacent network

Complexity

Medium

Authentication

Single

Confidentiality

Complete

Integrity

Complete

Availability

Complete

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2011-1751.md and follow it. Check whether this project is affected by CVE-2011-1751. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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