QEMU

CVE-2021-20255

MEDIUM 5.5

At a glance

Source: NVD
EPSS: EPSS 0.41 % · percentile 35 (2026-10-29)
State: PUBLISHED
Published: 2021-03-09 19:14 UTC
Updated: 2024-08-03 17:37 UTC
Assigner: redhat
NVD status: Modified

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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.

Weaknesses (CWE)

CWE-835 — Loop with Unreachable Exit Condition
CWE-674 — Uncontrolled Recursion

References

Scores

Version	Score	Vector	Scored by
CVSS 3.1	MEDIUM 5.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	NVD · nvd@nist.gov (Primary)
CVSS 2.0	LOW 2.1	AV:L/AC:L/Au:N/C:N/I:N/A:P	NVD · nvd@nist.gov (Primary)

European references

ENISA EUVD · EUVD-2021-7693
GCVE · GCVE-0-2021-20255

CERT-FR advisories

CERTFR-2026-AVI-0326 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
CERTFR-2026-AVI-0316 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

Affected products

Product	Versions
QEMU	affected all versions

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD

🟡 QEMU