synced 7 MIN AGO
01 Record

CVE-2021-3695

A crafted 16-bit grayscale PNG image may lead to a out-of-bounds write in the heap area. An attacker may take advantage of that to cause heap data corruption or eventually arbitrary code execution and

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

02 Description

A crafted 16-bit grayscale PNG image may lead to a out-of-bounds write in the heap area. An attacker may take advantage of that to cause heap data corruption or eventually arbitrary code execution and

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
0.46% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 39.9% of scored records. A rank, not a probability.
NVD base score
4.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
Moderate. 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
2022-07-06 15:06Z4 YR AGO
Last updated
2024-08-03 17:01Z2 YR AGO
Reserved
2021-08-10
Assigning CNA
redhat
Record state
PUBLISHED
Severity
Not rated by the issuing CNA
CNA CVSS vector
Not published by the issuing CNA
Weaknesses
Data version
5.1
Document digest
4448e6392ad557f93763744b49b32c850ef9747dee8da8d470765262fb8d8066

05 Affected products

VendorProductVersionsPlatforms
n/agrub2grub-2.06—

06 References

07 Fixed in

AlmaLinux 8

  • grub2-common
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-efi-aa64
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-efi-aa64-cdboot
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-efi-aa64-modules
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-efi-ia32
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-efi-ia32-cdboot
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-efi-ia32-modules
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-efi-x64
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-efi-x64-cdboot
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-efi-x64-modules
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-pc
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-pc-modules
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-ppc64le-modules
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-tools
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-tools-efi
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-tools-extra
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-tools-minimal
    Fixed in 1:2.02-123.el8_6.8.alma
  • shim-aa64
    Fixed in 15.6-1.el8.alma
  • shim-ia32
    Fixed in 15.6-1.el8.alma
  • shim-unsigned-x64
    Fixed in 15.6-1.el8.alma
  • shim-x64
    Fixed in 15.6-1.el8.alma

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

AlmaLinux 9

  • grub2-common
    Fixed in 1:2.06-27.el9_0.7.alma
  • grub2-efi-aa64
    Fixed in 1:2.06-27.el9_0.7.alma
  • grub2-efi-aa64-cdboot
    Fixed in 1:2.06-27.el9_0.7.alma
  • grub2-efi-aa64-modules
    Fixed in 1:2.06-27.el9_0.7.alma
  • grub2-efi-x64
    Fixed in 1:2.06-27.el9_0.7.alma
  • grub2-efi-x64-cdboot
    Fixed in 1:2.06-27.el9_0.7.alma
  • grub2-efi-x64-modules
    Fixed in 1:2.06-27.el9_0.7.alma
  • grub2-pc
    Fixed in 1:2.06-27.el9_0.7.alma
  • grub2-pc-modules
    Fixed in 1:2.06-27.el9_0.7.alma
  • grub2-ppc64le
    Fixed in 1:2.06-27.el9_0.7.alma
  • grub2-ppc64le-modules
    Fixed in 1:2.06-27.el9_0.7.alma
  • grub2-tools
    Fixed in 1:2.06-27.el9_0.7.alma
  • grub2-tools-efi
    Fixed in 1:2.06-27.el9_0.7.alma
  • grub2-tools-extra
    Fixed in 1:2.06-27.el9_0.7.alma
  • grub2-tools-minimal
    Fixed in 1:2.06-27.el9_0.7.alma
  • shim-aa64
    Fixed in 15.6-1.el9.alma
  • shim-unsigned-x64
    Fixed in 15.6-1.el9.alma
  • shim-x64
    Fixed in 15.6-1.el9.alma

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

Arch Linux

  • grub
    No fix yet

Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.

CloudLinux 8

  • grub2-common
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-efi-aa64
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-efi-aa64-cdboot
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-efi-aa64-modules
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-efi-ia32
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-efi-ia32-cdboot
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-efi-ia32-modules
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-efi-x64
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-efi-x64-cdboot
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-efi-x64-modules
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-pc
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-pc-modules
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-ppc64le-modules
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-tools
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-tools-efi
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-tools-extra
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-tools-minimal
    Fixed in 1:2.02-123.el8_6.8.alma
  • shim-aa64
    Fixed in 15.6-1.el8.alma
  • shim-ia32
    Fixed in 15.6-1.el8.alma
  • shim-unsigned-x64
    Fixed in 15.6-1.el8.alma
  • shim-x64
    Fixed in 15.6-1.el8.alma

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 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.

CloudLinux 9

  • grub2-common
    Fixed in 1:2.06-27.el9_0.7.alma
  • grub2-efi-aa64
    Fixed in 1:2.06-27.el9_0.7.alma
  • grub2-efi-aa64-cdboot
    Fixed in 1:2.06-27.el9_0.7.alma
  • grub2-efi-aa64-modules
    Fixed in 1:2.06-27.el9_0.7.alma
  • grub2-efi-x64
    Fixed in 1:2.06-27.el9_0.7.alma
  • grub2-efi-x64-cdboot
    Fixed in 1:2.06-27.el9_0.7.alma
  • grub2-efi-x64-modules
    Fixed in 1:2.06-27.el9_0.7.alma
  • grub2-pc
    Fixed in 1:2.06-27.el9_0.7.alma
  • grub2-pc-modules
    Fixed in 1:2.06-27.el9_0.7.alma
  • grub2-ppc64le
    Fixed in 1:2.06-27.el9_0.7.alma
  • grub2-ppc64le-modules
    Fixed in 1:2.06-27.el9_0.7.alma
  • grub2-tools
    Fixed in 1:2.06-27.el9_0.7.alma
  • grub2-tools-efi
    Fixed in 1:2.06-27.el9_0.7.alma
  • grub2-tools-extra
    Fixed in 1:2.06-27.el9_0.7.alma
  • grub2-tools-minimal
    Fixed in 1:2.06-27.el9_0.7.alma
  • shim-aa64
    Fixed in 15.6-1.el9.alma
  • shim-unsigned-x64
    Fixed in 15.6-1.el9.alma
  • shim-x64
    Fixed in 15.6-1.el9.alma

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

  • grub2
    Fixed in 2.06-3

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

Debian 13

  • grub2
    Fixed in 2.06-3

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

Debian 14

  • grub2
    Fixed in 2.06-3

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

Ubuntu 16.04 LTS

  • grub2-signed
    No fix yet
  • grub2-unsigned
    No fix yet

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

Ubuntu 18.04 LTS

  • grub2-signed
    Fixed in 1.187.3~18.04.1
  • grub2-unsigned
    Fixed in 2.06-2ubuntu14.1

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

Ubuntu 20.04 LTS

  • grub2-signed
    Fixed in 1.187.3~20.04.1
  • grub2-unsigned
    Fixed in 2.06-2ubuntu14.1

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

Ubuntu 22.04 LTS

  • grub2-signed
    Fixed in 1.187.3~22.04.1
  • grub2-unsigned
    Fixed in 2.06-2ubuntu14.1

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

Ubuntu Pro 14.04 LTS

  • grub2-signed
    No fix yet

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.