CVE-2021-3409

Severity: medium (CVSS 5.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-03-23 · updated 2026-06-17
Weakness: CWE-119

Description

The patch for CVE-2020-17380/CVE-2020-25085 was found to be ineffective, thus making QEMU vulnerable to the out-of-bounds read/write access issues previously found in the SDHCI controller emulation code. This flaw allows a malicious privileged guest to crash the QEMU process on the host, resulting in a denial of service or potential code execution. QEMU up to (including) 5.2.0 is affected by this.

Affected products

Debian Linux: 9.0
Fedoraproject Fedora: 33
QEMU: through 5.2.0
Red Hat Enterprise Linux: 7.0

References

https://bugzilla.redhat.com/show_bug.cgi?id=1928146
https://lists.debian.org/debian-lts-announce/2021/04/msg00009.html
https://security.gentoo.org/glsa/202208-27
https://security.netapp.com/advisory/ntap-20210507-0001/
https://www.openwall.com/lists/oss-security/2021/03/09/1
https://bugzilla.redhat.com/show_bug.cgi?id=1928146
https://lists.debian.org/debian-lts-announce/2021/04/msg00009.html
https://security.gentoo.org/glsa/202208-27
https://security.netapp.com/advisory/ntap-20210507-0001/
https://www.openwall.com/lists/oss-security/2021/03/09/1

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