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QEMU Vulnerability ![Clock Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-clock.svg) \< 1 min read Related Products [![Advanced WildFire icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/strata_RGB_logo_Icon_Color.png)Advanced WildFire](https://unit42.paloaltonetworks.com/product-category/advanced-wildfire/ "Advanced WildFire") * ![Profile Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-profile-grey.svg) By: * [Ryan Salsamendi](https://unit42.paloaltonetworks.com/author/ryan-salsamendi/) * ![Published Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-calendar-grey.svg) Published:September 14, 2017 * ![Tags Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-category.svg) Categories: * [Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) * [Vulnerabilities](https://unit42.paloaltonetworks.com/category/vulnerabilities/) * ![Tags Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-tags-grey.svg) Tags: * [QEMU](https://unit42.paloaltonetworks.com/tag/qemu/) * [![Download Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-download.svg)](https://unit42.paloaltonetworks.com/unit42-palo-alto-networks-discovers-new-qemu-vulnerability/?pdf=download&lg=en&_wpnonce=aa719621b8 "Click here to download") * [![Print Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-print.svg)](https://unit42.paloaltonetworks.com/unit42-palo-alto-networks-discovers-new-qemu-vulnerability/?pdf=print&lg=en&_wpnonce=aa719621b8 "Click here to print") Share![Down arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/down-arrow.svg) * ![Link 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Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-reddit-share.svg)](https://www.paloaltonetworks.com//www.reddit.com/submit?url=https%3A%2F%2Funit42.paloaltonetworks.com%2Funit42-palo-alto-networks-discovers-new-qemu-vulnerability%2F&ts=markdown "Share in Reddit") * [![Mastodon Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-mastodon-share.svg)](https://mastodon.social/share?text=Palo%20Alto%20Networks%20Discovers%20New%20QEMU%20Vulnerability%20https%3A%2F%2Funit42.paloaltonetworks.com%2Funit42-palo-alto-networks-discovers-new-qemu-vulnerability%2F "Share in Mastodon") Palo Alto Networks Unit 42 recently discovered [CVE-2017-12809](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-12809), which is a vulnerability affecting [QEMU](https://www.qemu.org/) beginning with version 2.8. We reported this vulnerability and it has been fixed in QEMU version 2.10.0 released on August 30, 2017. The latest version can be obtained from QEMU [here](https://www.qemu.org/download/#source). The vulnerability results from a flaw in the way QEMU's emulated hard drive controller handles the ATA\_CACHE\_FLUSH command. The QEMU host process will dereference a NULL pointer if ATA\_CACHE\_FLUSH is issued to a removable drive with no disk present (the default configuration). This causes the host OS to terminate QEMU. In Windows, this can be triggered from user mode by an unprivileged process by opening a handle to the emulated CDROM drive using the CreateFile() API, followed by DeviceIoControl() with IOCTL\_ATA\_PASS\_THROUGH. Using this technique on a real physical machine will have no effect. We found the vulnerability by hooking LLVM's libFuzzer up to QEMU's emulated memory and IO ports. Our custom hypervisor undergoes continuous fuzzing with this and other fuzzers to ensure the highest security for our customers. Many security products use QEMU to sandbox files in the process of determining if they are malicious. By triggering this vulnerability before malicious behavior, an attacker can force security products to classify malicious files as benign. Palo Alto Networks products are not affected by this vulnerability. The WildFire service detonates malware in a custom hypervisor that does not share any code with QEMU. Back to top ### Tags * [QEMU](https://unit42.paloaltonetworks.com/tag/qemu/ "QEMU") [Threat Research Center](https://unit42.paloaltonetworks.com "Threat Research") [Next: LabyREnth CTF 2017: Check Out the Prizes](https://unit42.paloaltonetworks.com/unit42-labyrenth-ctf-2017-check-out-the-prizes/ "LabyREnth CTF 2017: Check Out the Prizes") ### Related Articles ## Related Vulnerabilities Resources ![Pictorial representation of NetScaler zero days. 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Digital illustration of a map of North America with interconnected glowing lines and dots symbolizing network connections across the continent.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/05/06_Vulnerabilities_1920x900-3-1-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/07/top-threats.svg)High Profile Threats](https://unit42.paloaltonetworks.com/category/top-cyberthreats/) May 6, 2026 [#### Threat Brief: Exploitation of PAN-OS Captive Portal Zero-Day for Unauthenticated Remote Code Execution](https://unit42.paloaltonetworks.com/captive-portal-zero-day/) * [CVE-2026-0300](https://unit42.paloaltonetworks.com/tag/cve-2026-0300/ "CVE-2026-0300") * [EarthWorm](https://unit42.paloaltonetworks.com/tag/earthworm/ "EarthWorm") * [PAN-OS](https://unit42.paloaltonetworks.com/tag/pan-os/ "PAN-OS") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/captive-portal-zero-day/ "Threat Brief: Exploitation of PAN-OS Captive Portal Zero-Day for Unauthenticated Remote Code Execution") ![Pictorial representation of a severe Linux vulnerability. 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Abstract image of a glowing red Wi-Fi symbol on a circuit board, with intricate patterns and a futuristic appearance.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/04/04_Vulnerabilities_1920x900-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) April 16, 2026 [#### A Deep Dive Into Attempted Exploitation of CVE-2023-33538](https://unit42.paloaltonetworks.com/exploitation-of-cve-2023-33538/) * [Botnet](https://unit42.paloaltonetworks.com/tag/botnet/ "botnet") * [Command injection](https://unit42.paloaltonetworks.com/tag/command-injection/ "Command injection") * [CVE-2023-33538](https://unit42.paloaltonetworks.com/tag/cve-2023-33538/ "CVE-2023-33538") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/exploitation-of-cve-2023-33538/ "A Deep Dive Into Attempted Exploitation of CVE-2023-33538") ![Pictorial representation of BeyondTrust vulnerability CVE-2026-1731. Digital art depicting a stylized mountain range with vibrant blue and red hues. 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