CVE-2020-35505

Name: CVE-2020-35505
Creator: NVD / NIST
Published: 2021-05-28T11:15:07.79+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.4/10EPSS 0.32%

Last modified Jun 17, 2026

CVE-2020-35505 is a medium-severity vulnerability rated 4.4/10 on the CVSS scale. A NULL pointer dereference flaw was found in the am53c974 SCSI host bus adapter emulation of QEMU in versions before 6.0.0. This issue occurs while handling the 'Information Transfer' command. EPSS estimates a 0.32% chance of exploitation in the next 30 days.

Description

A NULL pointer dereference flaw was found in the am53c974 SCSI host bus adapter emulation of QEMU in versions before 6.0.0. This issue occurs while handling the 'Information Transfer' command. 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

4.4/10

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

EPSS Probability

0.32%

23.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions	Update
Qemu	Qemu	< 6.0.0	—
Qemu	Qemu	6.0.0	Rc1
Debian	Debian Linux	10.0	—

References

http://www.openwall.com/lists/oss-security/2021/04/16/3Mailing List, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1909769Issue 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, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1909769Issue 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-2020-35505?

How severe is CVE-2020-35505?

CVE-2020-35505 has a CVSS score of 4.4/10 (MEDIUM severity). The EPSS model estimates a 0.32% probability of exploitation in the next 30 days.

How do I fix CVE-2020-35505?

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-2020-35505?

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

Scan your code now

Source: NVD / NIST