CVE-2020-14311

Name: CVE-2020-14311
Creator: NVD / NIST
Published: 2020-07-31T22:15:11.597+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6/10EPSS 0.46%

Last modified Jun 17, 2026

CVE-2020-14311 is a medium-severity vulnerability rated 6/10 on the CVSS scale. There is an issue with grub2 before version 2.06 while handling symlink on ext filesystems. A filesystem containing a symbolic link with an inode size of UINT32_MAX causes an arithmetic overflow leading to a zero-sized memory allocation with subsequent heap-based buffer overflow.. EPSS estimates a 0.46% chance of exploitation in the next 30 days.

Description

There is an issue with grub2 before version 2.06 while handling symlink on ext filesystems. A filesystem containing a symbolic link with an inode size of UINT32_MAX causes an arithmetic overflow leading to a zero-sized memory allocation with subsequent heap-based buffer overflow.

Metrics

CVSS 3.1

6/10

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H

EPSS Probability

0.46%

36.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Gnu	Grub2	< 2.06
Redhat	Enterprise Linux	7.0
Redhat	Enterprise Linux	8.0
Redhat	Enterprise Linux Eus	8.1
Redhat	Enterprise Linux Eus	8.2
Redhat	Enterprise Linux Server Aus	8.2
Redhat	Enterprise Linux Server Tus	8.2
Opensuse	Leap	15.1
Opensuse	Leap	15.2
Canonical	Ubuntu Linux	14.04
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	18.04
Canonical	Ubuntu Linux	20.04

References

http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.htmlMailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/09/17/2Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/09/17/4Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/09/21/1Mailing List, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-14311Issue Tracking, Third Party Advisory
https://security.gentoo.org/glsa/202104-05Third Party Advisory
https://usn.ubuntu.com/4432-1/Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.htmlMailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/09/17/2Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/09/17/4Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/09/21/1Mailing List, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-14311Issue Tracking, Third Party Advisory
https://security.gentoo.org/glsa/202104-05Third Party Advisory
https://usn.ubuntu.com/4432-1/Third Party Advisory

Timeline

Published: Jul 31, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-14311?

How severe is CVE-2020-14311?

CVE-2020-14311 has a CVSS score of 6/10 (MEDIUM severity). The EPSS model estimates a 0.46% probability of exploitation in the next 30 days.

How do I fix CVE-2020-14311?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-14311?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST