CVE-2020-35504

Name: CVE-2020-35504
Creator: NVD / NIST
Published: 2021-05-28T11:15:07.75+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6/10EPSS 0.34%

Last modified Jun 17, 2026

CVE-2020-35504 is a medium-severity vulnerability rated 6/10 on the CVSS scale. A NULL pointer dereference flaw was found in the SCSI emulation support of QEMU in versions before 6.0.0. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. EPSS estimates a 0.34% chance of exploitation in the next 30 days.

Description

A NULL pointer dereference flaw was found in the SCSI emulation support of QEMU in versions before 6.0.0. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

Metrics

CVSS 3.1

6/10

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H

EPSS Probability

0.34%

25.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Qemu	Qemu	< 6.0.0
Fedoraproject	Fedora	33
Debian	Debian Linux	10.0

References

http://www.openwall.com/lists/oss-security/2021/04/16/3Mailing List, Patch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1909766Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/202208-27Third Party Advisory
https://security.netapp.com/advisory/ntap-20210713-0006/Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/04/16/3Mailing List, Patch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/04/16/3Mailing List, Patch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1909766Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/202208-27Third Party Advisory
https://security.netapp.com/advisory/ntap-20210713-0006/Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/04/16/3Mailing List, Patch, Third Party Advisory

Timeline

Published: May 28, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-35504?

How severe is CVE-2020-35504?

CVE-2020-35504 has a CVSS score of 6/10 (MEDIUM severity). The EPSS model estimates a 0.34% probability of exploitation in the next 30 days.

How do I fix CVE-2020-35504?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-35504?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST