CVE-2020-35503

Name: CVE-2020-35503
Creator: NVD / NIST
Published: 2021-06-02T14:15:07.877+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6/10EPSS 0.27%

Last modified Jun 17, 2026

CVE-2020-35503 is a medium-severity vulnerability rated 6/10 on the CVSS scale. A NULL pointer dereference flaw was found in the megasas-gen2 SCSI host bus adapter emulation of QEMU in versions before and including 6.0. This issue occurs in the megasas_command_cancelled() callback function while dropping a SCSI request. EPSS estimates a 0.27% chance of exploitation in the next 30 days.

Description

A NULL pointer dereference flaw was found in the megasas-gen2 SCSI host bus adapter emulation of QEMU in versions before and including 6.0. This issue occurs in the megasas_command_cancelled() callback function while dropping a SCSI request. 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

0.27%

19.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-476

Affected Software

Vendor	Product	Versions
Qemu	Qemu	<= 6.0.0
Fedoraproject	Fedora	33

References

https://bugzilla.redhat.com/show_bug.cgi?id=1910346Issue Tracking, Third Party Advisory
https://security.netapp.com/advisory/ntap-20210720-0008/Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1910346Issue Tracking, Third Party Advisory
https://security.netapp.com/advisory/ntap-20210720-0008/Third Party Advisory

Timeline

Published: Jun 2, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-35503?

How severe is CVE-2020-35503?

CVE-2020-35503 has a CVSS score of 6/10 (MEDIUM severity). The EPSS model estimates a 0.27% probability of exploitation in the next 30 days.

How do I fix CVE-2020-35503?

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-2020-35503?

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

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Source: NVD / NIST