CVE-2021-20255

MEDIUM

QEMU - Denial of Service via eepro100 i8255x Device Emulator Recursion

Title source: llm
STIX 2.1

Description

A stack overflow via an infinite recursion vulnerability was found in the eepro100 i8255x device emulator of QEMU. This issue occurs while processing controller commands due to a DMA reentry issue. This flaw allows a guest user or process to consume CPU cycles or crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

References (5)

Core 5
Core References
Issue Tracking, Patch, Third Party Advisory x_refsource_misc
https://bugzilla.redhat.com/show_bug.cgi?id=1930646
Mailing List, Patch, Third Party Advisory x_refsource_misc
https://www.openwall.com/lists/oss-security/2021/02/25/1
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2021/04/msg00009.html
Third Party Advisory x_refsource_confirm
https://security.netapp.com/advisory/ntap-20210507-0003/

Scores

CVSS v3 5.5
EPSS 0.0041
EPSS Percentile 32.5%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Details

CWE
CWE-674 CWE-835
Status published
Products (2)
debian/debian_linux 9.0
qemu/qemu
Published Mar 09, 2021
Tracked Since Feb 18, 2026