medium
6.9
CWE
787
Advisory Published
CVE Published
CVE Published
Updated

CVE-2021-3696

First published: Mon Aug 09 2021(Updated: )

A heap out-of-bounds write may heppen during the handling of Huffman tables in the PNG reader. This may lead to data corruption in the heap space. Confidentiality, Integrity and Availablity impact may be considered Low as it's very complex to an attacker control the encoding and positioning of corrupted Huffman entries to achieve results such as arbitrary code execution and/or secure boot circumvention. This flaw affects grub2 versions prior grub-2.12.

Credit: secalert@redhat.com secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
debian/grub2
2.06-3~deb10u1
2.06-3~deb10u3
2.06-3~deb11u5
2.06-3~deb11u4
2.06-13
2.12~rc1-9
redhat/grub2<1:2.02-123.el8_6.8
1:2.02-123.el8_6.8
redhat/grub2<1:2.02-87.el8_1.10
1:2.02-87.el8_1.10
redhat/grub2<1:2.02-87.el8_2.10
1:2.02-87.el8_2.10
redhat/grub2<1:2.02-99.el8_4.9
1:2.02-99.el8_4.9
redhat/grub2<1:2.06-27.el9_0.7
1:2.06-27.el9_0.7
redhat/grub<2.12
2.12
Gnu Grub2>=2.00<2.12
Redhat Developer Tools=1.0
Redhat Openshift=3.0
Red Hat Enterprise Linux=8.0
Red Hat Enterprise Linux=8.1
Red Hat Enterprise Linux=8.4
Red Hat Enterprise Linux=9.0
Redhat Enterprise Linux Eus=8.2
Redhat Enterprise Linux Eus=8.4
Redhat Enterprise Linux Eus=8.6
Redhat Enterprise Linux Eus=9.0
Redhat Enterprise Linux For Power Little Endian=8.0
Redhat Enterprise Linux For Power Little Endian=9.0
Redhat Enterprise Linux For Power Little Endian Eus=8.2
Redhat Enterprise Linux For Power Little Endian Eus=8.4
Redhat Enterprise Linux For Power Little Endian Eus=8.6
Redhat Enterprise Linux For Power Little Endian Eus=9.0
Red Hat Enterprise Linux Server=8.2
Red Hat Enterprise Linux Server=8.4
Red Hat Enterprise Linux Server=8.6
Redhat Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions=8.1
Redhat Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions=8.2
Redhat Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions=8.4
Redhat Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions=8.6
Redhat Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions=9.0
Red Hat Enterprise Linux Server=8.2
Red Hat Enterprise Linux Server=8.4
Red Hat Enterprise Linux Server=8.6
Red Hat OpenShift Container Platform=4.6
Red Hat OpenShift Container Platform=4.9
Red Hat OpenShift Container Platform=4.10
Red Hat Enterprise Linux=8.0
Redhat Codeready Linux Builder
Red Hat Enterprise Linux=9.0
Redhat Enterprise Linux Eus=8.2
Redhat Enterprise Linux Eus=8.4
Redhat Enterprise Linux Eus=8.6
Redhat Enterprise Linux Eus=9.0
NetApp ONTAP Select Deploy administration utility

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Read MoreStart Free Trial

Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2021-3696?

    CVE-2021-3696 is a vulnerability found in grub2 when handling a PNG image header, which can lead to data corruption in the heap space.

  • What is the severity of CVE-2021-3696?

    The severity of CVE-2021-3696 is medium with a severity value of 5.

  • What software is affected by CVE-2021-3696?

    The affected software includes grub2 versions 1:2.02-123.el8_6.8, 1:2.02-87.el8_1, 1:2.02-87.el8_2, 1:2.02-99.el8_4.9, and 1:2.06-27.el9_0.7.

  • How can I fix CVE-2021-3696?

    You can fix CVE-2021-3696 by applying the recommended patches provided by Redhat.

  • Where can I find more information about CVE-2021-3696?

    You can find more information about CVE-2021-3696 on the CVE website (https://www.cve.org/CVERecord?id=CVE-2021-3696) and NIST NVD (https://nvd.nist.gov/vuln/detail/CVE-2021-3696).

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2025 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203