CVE-2021-3507
published 2021-05-06CVE-2021-3507: 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…
PriorityP428medium6.1CVSS 3.1
AVLACLPRLUINSUCHINAL
EPSS
0.48%
38.6th percentile
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
14 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | debian_linux | — | — |
| debian | qemu | < qemu 1:7.1+dfsg-1 (bookworm) | qemu 1:7.1+dfsg-1 (bookworm) |
| msrc | cm1_qemu-kvm_4.2.0-48_on_cbl_mariner_1.0 | — | — |
| qemu | qemu | <= 6.0.0 | — |
| qemu | qemu | — | — |
| qemu | qemu | >= 0 < 1:5.2+dfsg-11+deb11u3 | 1:5.2+dfsg-11+deb11u3 |
| qemu | qemu | >= 0 < 1:7.1+dfsg-1 | 1:7.1+dfsg-1 |
| qemu | qemu | >= 0 < 1:7.1+dfsg-1 | 1:7.1+dfsg-1 |
| qemu | qemu | >= 0 < 1:7.1+dfsg-1 | 1:7.1+dfsg-1 |
| qemu | qemu | >= 0 < 1:2.11+dfsg-1ubuntu7.40 | 1:2.11+dfsg-1ubuntu7.40 |
| qemu | qemu | >= 0 < 1:4.2-3ubuntu6.23 | 1:4.2-3ubuntu6.23 |
| qemu | qemu | >= 0 < 1:6.2+dfsg-2ubuntu6.2 | 1:6.2+dfsg-2ubuntu6.2 |
| redhat | enterprise_linux | — | — |
| ubuntu | qemu | — | — |
CVSS provenance
nvdv3.16.1MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
nvdv2.03.6LOWAV:L/AC:L/Au:N/C:P/I:N/A:P
osv6.1MEDIUM
vendor_debian6.1MEDIUM
vendor_msrc6.1MEDIUM
vendor_redhat6.1MEDIUM
vendor_ubuntu6.1MEDIUM
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Ubuntu
QEMU regression
vendor_ubuntu·2026-06-28·CVSS 3.8
CVE-2020-11947 [LOW] QEMU regression
Title: QEMU regression
Summary: USN-8412-1 introduced a regression in QEMU
USN-8412-1 fixed vulnerabilities QEMU. On Ubuntu 20.04 LTS, the fix for
CVE-2024-4467 was incomplete and prevented the creation of boot volumes
from qcow2 images. This update fixes the problem.
We apologize for the inconvenience.
Original advisory details:
Felipe Franciosi, Raphael Norwitz, and Peter Turschmid discovered that the
iSCSI block driver in QEMU incorrectly handled certain responses from an
iSCSI server. A remote attacker could possibly use this issue to cause
QEMU to crash, resulting in a denial of service, or possibly execute
arbitrary code. This issue only affected Ubuntu 14.04 LTS. (CVE-2020-1711)
It was discovered that the iSCSI block driver in QEMU incorrectly handled
certain memory operations
Ubuntu
QEMU vulnerabilities
vendor_ubuntu·2026-06-09·CVSS 3.8
CVE-2021-3416 [LOW] QEMU vulnerabilities
Title: QEMU vulnerabilities
Summary: Several security issues were fixed in QEMU.
Felipe Franciosi, Raphael Norwitz, and Peter Turschmid discovered that the
iSCSI block driver in QEMU incorrectly handled certain responses from an
iSCSI server. A remote attacker could possibly use this issue to cause QEMU
to crash, resulting in a denial of service, or possibly execute arbitrary
code. This issue only affected Ubuntu 14.04 LTS. (CVE-2020-1711)
It was discovered that the iSCSI block driver in QEMU incorrectly handled
certain memory operations, leading to a heap-based buffer over-read. An
attacker could possibly use this issue to expose sensitive information from
the host. This issue only affected Ubuntu 14.04 LTS. (CVE-2020-11947)
Ziming Zhang discovered that the SM501 display driver in QEM
Ubuntu
QEMU vulnerabilities
vendor_ubuntu·2022-06-21·CVSS 6.1
CVE-2022-26354 [MEDIUM] QEMU vulnerabilities
Title: QEMU vulnerabilities
Summary: Several security issues were fixed in QEMU.
Alexander Bulekov discovered that QEMU incorrectly handled floppy disk
emulation. A privileged attacker inside the guest could use this issue to
cause QEMU to crash, resulting in a denial of service, or possibly leak
sensitive information. (CVE-2021-3507)
It was discovered that QEMU incorrectly handled NVME controller emulation.
An attacker inside the guest could use this issue to cause QEMU to crash,
resulting in a denial of service, or possibly execute arbitrary code. This
issue only affected Ubuntu 22.04 LTS. (CVE-2021-3929)
It was discovered that QEMU incorrectly handled QXL display device
emulation. A privileged attacker inside the guest could use this issue to
cause QEMU to crash, resulting in a deni
Microsoft
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 fro
vendor_msrc·2021-05-11·CVSS 6.1
CVE-2021-3507 [MEDIUM] CWE-119 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 fro
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.
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is co
Red Hat
QEMU: fdc: heap buffer overflow in DMA read data transfers
vendor_redhat·2021-04-19·CVSS 6.1
CVE-2021-3507 [MEDIUM] CWE-119 QEMU: fdc: heap buffer overflow in DMA read data transfers
QEMU: fdc: heap buffer overflow in DMA read data transfers
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.
A heap buffer overflow was found in the floppy disk emulator of QEMU. 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 potenti
Debian
CVE-2021-3507: qemu - A heap buffer overflow was found in the floppy disk emulator of QEMU up to 6.0.0...
vendor_debian·2021·CVSS 6.1
CVE-2021-3507 [MEDIUM] CVE-2021-3507: qemu - A heap buffer overflow was found in the floppy disk emulator of QEMU up to 6.0.0...
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.
Scope: local
bookworm: resolved (fixed in 1:7.1+dfsg-1)
bullseye: resolved (fixed in 1:5.2+dfsg-11+deb11u3)
forky: resolved (fixed in 1:7.1+dfsg-1)
sid: resolved (fixed in 1:7.1+dfsg-1)
trixie: resolved (fixed in 1:7.1+dfsg-1)
OSV
qemu vulnerabilities
osv·2022-06-21·CVSS 6.1
CVE-2021-3507 [MEDIUM] qemu vulnerabilities
qemu vulnerabilities
Alexander Bulekov discovered that QEMU incorrectly handled floppy disk
emulation. A privileged attacker inside the guest could use this issue to
cause QEMU to crash, resulting in a denial of service, or possibly leak
sensitive information. (CVE-2021-3507)
It was discovered that QEMU incorrectly handled NVME controller emulation.
An attacker inside the guest could use this issue to cause QEMU to crash,
resulting in a denial of service, or possibly execute arbitrary code. This
issue only affected Ubuntu 22.04 LTS. (CVE-2021-3929)
It was discovered that QEMU incorrectly handled QXL display device
emulation. A privileged attacker inside the guest could use this issue to
cause QEMU to crash, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2021-
GHSA
GHSA-m99h-7jcp-j7w9: A heap buffer overflow was found in the floppy disk emulator of QEMU up to 6
ghsa_unreviewed·2022-05-24
CVE-2021-3507 [MEDIUM] CWE-119 GHSA-m99h-7jcp-j7w9: A heap buffer overflow was found in the floppy disk emulator of QEMU up to 6
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.
OSV
CVE-2021-3507: A heap buffer overflow was found in the floppy disk emulator of QEMU up to 6
osv·2021-05-06·CVSS 6.1
CVE-2021-3507 [MEDIUM] CVE-2021-3507: A heap buffer overflow was found in the floppy disk emulator of QEMU up to 6
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.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://bugzilla.redhat.com/show_bug.cgi?id=1951118https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlhttps://security.netapp.com/advisory/ntap-20210528-0005/https://bugzilla.redhat.com/show_bug.cgi?id=1951118https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlhttps://security.netapp.com/advisory/ntap-20210528-0005/
2021-05-06
Published