What’s Vulnerable › Vulnerabilities

CVE-2020-35506

• Severity: medium (CVSS 6.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-05-28 · updated 2026-06-17
• Weakness: CWE-416

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.

Affected products

• QEMU: before 6.0.0 — fixed in 6.0.0

How to fix

Upgrade to a fixed version: QEMU 6.0.0. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2021/04/16/3
• https://bugzilla.redhat.com/show_bug.cgi?id=1909996
• https://security.gentoo.org/glsa/202208-27
• https://security.netapp.com/advisory/ntap-20210713-0006/
• https://www.openwall.com/lists/oss-security/2021/04/16/3
• http://www.openwall.com/lists/oss-security/2021/04/16/3
• https://bugzilla.redhat.com/show_bug.cgi?id=1909996
• https://security.gentoo.org/glsa/202208-27
• https://security.netapp.com/advisory/ntap-20210713-0006/
• https://www.openwall.com/lists/oss-security/2021/04/16/3

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