synced 13 MIN AGO
01 Record

CVE-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 while processing DMA read data transfers

UnratedPUBLISHEDCNA: redhat
CNA base scoreUnratedNo CNA CVSS vector
View raw JSON

02 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

03 Exploitation and scoring

Exploitation
Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision
Not assessed by CISA
EPSS probability
0.48% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 41.8% of scored records. A rank, not a probability.
NVD base score
6.1 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
Low. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2021-05-06 15:16Z5 YR AGO
Last updated
2024-08-03 16:53Z2 YR AGO
Reserved
2021-04-19
Assigning CNA
redhat
Record state
PUBLISHED
Severity
Not rated by the issuing CNA
CNA CVSS vector
Not published by the issuing CNA
Weaknesses
  • CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferClass
  • CWE-787Out-of-bounds WriteBase
Data version
5.1
Document digest
5f3fc205e18cca5469869851ab6f722b926fc78e35959affaecae6cabdbe3fb9

05 Affected products

VendorProductVersionsPlatforms
n/aQEMUup to 6.0.0 (including)—

06 References

07 Fixed in

AlmaLinux 9

  • qemu-guest-agent
    Fixed in 17:7.0.0-13.el9
  • qemu-img
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-audio-pa
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-block-curl
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-block-rbd
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-common
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-core
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-device-display-virtio-gpu
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-device-display-virtio-gpu-ccw
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-device-display-virtio-gpu-gl
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-device-display-virtio-gpu-pci
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-device-display-virtio-gpu-pci-gl
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-device-display-virtio-vga
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-device-display-virtio-vga-gl
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-device-usb-host
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-device-usb-redirect
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-docs
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-tools
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-ui-egl-headless
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-ui-opengl
    Fixed in 17:7.0.0-13.el9
  • qemu-pr-helper
    Fixed in 17:7.0.0-13.el9

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 9

  • qemu-guest-agent
    Fixed in 17:7.0.0-13.el9
  • qemu-img
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-audio-pa
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-block-curl
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-block-rbd
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-common
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-core
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-device-display-virtio-gpu
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-device-display-virtio-gpu-ccw
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-device-display-virtio-gpu-gl
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-device-display-virtio-gpu-pci
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-device-display-virtio-gpu-pci-gl
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-device-display-virtio-vga
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-device-display-virtio-vga-gl
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-device-usb-host
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-device-usb-redirect
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-docs
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-tools
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-ui-egl-headless
    Fixed in 17:7.0.0-13.el9
  • qemu-kvm-ui-opengl
    Fixed in 17:7.0.0-13.el9
  • qemu-pr-helper
    Fixed in 17:7.0.0-13.el9

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • qemu
    Fixed in 1:7.1+dfsg-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • qemu
    Fixed in 1:7.1+dfsg-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • qemu
    Fixed in 1:7.1+dfsg-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 18.04 LTS

  • qemu
    Fixed in 1:2.11+dfsg-1ubuntu7.40

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

  • qemu
    Fixed in 1:4.2-3ubuntu6.23

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • qemu
    Fixed in 1:6.2+dfsg-2ubuntu6.2

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 14.04 LTS

  • qemu
    Fixed in 2.0.0+dfsg-2ubuntu1.47+esm6
    Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 16.04 LTS

  • qemu
    Fixed in 1:2.5+dfsg-5ubuntu10.51+esm4
    Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.