CVE-2020-35506

Name: CVE-2020-35506
Creator: NVD / NIST
Published: 2021-05-28T11:15:07.83+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.7/10EPSS 0.37%

Last modified Jun 17, 2026

CVE-2020-35506 is a medium-severity vulnerability rated 6.7/10 on the CVSS scale. A use-after-free vulnerability was found in the am53c974 SCSI host bus adapter emulation of QEMU in versions before 6.0.0 during the handling of the 'Information Transfer' command (CMD_TI). This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service or potential code execution with the privileges of the QEMU process.. EPSS estimates a 0.37% chance of exploitation in the next 30 days.

Description

A use-after-free vulnerability was found in the am53c974 SCSI host bus adapter emulation of QEMU in versions before 6.0.0 during the handling of the 'Information Transfer' command (CMD_TI). This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service or potential code execution with the privileges of the QEMU process.

Metrics

CVSS 3.1

6.7/10

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

EPSS Probability

0.37%

28.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Qemu	Qemu	< 6.0.0

References

http://www.openwall.com/lists/oss-security/2021/04/16/3Mailing List, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1909996Issue Tracking, 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, 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=1909996Issue Tracking, 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, Third Party Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2020-35506?

How severe is CVE-2020-35506?

CVE-2020-35506 has a CVSS score of 6.7/10 (MEDIUM severity). The EPSS model estimates a 0.37% probability of exploitation in the next 30 days.

How do I fix CVE-2020-35506?

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-2020-35506?

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

Scan your code now

Source: NVD / NIST