What’s Vulnerable › Vulnerabilities

CVE-2021-3507

• Severity: medium (CVSS 6.1 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: yes
• Published: 2021-05-06 · updated 2026-06-17
• Weakness: CWE-119

Description

A heap buffer overflow was found in the floppy disk emulator of QEMU up to 6.0.0 (including). It could occur in fdctrl_transfer_handler() in hw/block/fdc.c while processing DMA read data transfers from the floppy drive to the guest system. A privileged guest user could use this flaw to crash the QEMU process on the host resulting in DoS scenario, or potential information leakage from the host memory.

Affected products

• Debian Linux: 10.0
• QEMU: through 6.0.0
• Red Hat Enterprise Linux: 8.0

References

• https://bugzilla.redhat.com/show_bug.cgi?id=1951118
• https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
• https://security.netapp.com/advisory/ntap-20210528-0005/
• https://bugzilla.redhat.com/show_bug.cgi?id=1951118
• https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
• https://security.netapp.com/advisory/ntap-20210528-0005/

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