CVE-2021-20225

medium
New! CVE Severity Now Using CVSS v3

The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Description

A flaw was found in grub2 in versions prior to 2.06. The option parser allows an attacker to write past the end of a heap-allocated buffer by calling certain commands with a large number of specific short forms of options. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

References

https://bugzilla.redhat.com/show_bug.cgi?id=1924696

https://lists.fedoraproject.org/archives/list/[email protected]/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/

https://security.gentoo.org/glsa/202104-05

Details

Source: MITRE

Published: 2021-03-03

Updated: 2021-05-01

Type: CWE-787

Risk Information

CVSS v2

Base Score: 7.2

Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C

Impact Score: 10

Exploitability Score: 3.9

Severity: HIGH

CVSS v3

Base Score: 6.7

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

Impact Score: 5.9

Exploitability Score: 0.8

Severity: MEDIUM

Tenable Plugins

View all (48 total)

IDNameProductFamilySeverity
153777RHEL 8 : shim and fwupd (RHSA-2021:3675)NessusRed Hat Local Security Checks
high
153312EulerOS 2.0 SP2 : grub2 (EulerOS-SA-2021-2376)NessusHuawei Local Security Checks
high
151844RHEL 8 : shim and fwupd (RHSA-2021:2790)NessusRed Hat Local Security Checks
high
151799Amazon Linux 2 : grub2 (ALAS-2021-1684)NessusAmazon Linux Local Security Checks
high
151415EulerOS Virtualization 3.0.2.2 : grub2 (EulerOS-SA-2021-2126)NessusHuawei Local Security Checks
high
151362CentOS 8 : fwupd (CESA-2021:2566)NessusCentOS Local Security Checks
high
151349EulerOS Virtualization for ARM 64 3.0.2.0 : grub2 (EulerOS-SA-2021-2082)NessusHuawei Local Security Checks
high
151256EulerOS Virtualization 3.0.6.6 : grub2 (EulerOS-SA-2021-2027)NessusHuawei Local Security Checks
high
151182EulerOS Virtualization for ARM 64 3.0.6.0 : grub2 (EulerOS-SA-2021-2001)NessusHuawei Local Security Checks
high
151140RHEL 8 : fwupd (RHSA-2021:2566)NessusRed Hat Local Security Checks
high
150867Ubuntu 18.04 LTS / 20.04 LTS : GRUB 2 vulnerabilities (USN-4992-1)NessusUbuntu Local Security Checks
high
150532SUSE SLES11 Security Update : grub2 (SUSE-SU-2021:14659-1)NessusSuSE Local Security Checks
high
150210EulerOS 2.0 SP9 : grub2 (EulerOS-SA-2021-1927)NessusHuawei Local Security Checks
high
150176EulerOS 2.0 SP9 : grub2 (EulerOS-SA-2021-1948)NessusHuawei Local Security Checks
high
149687RHEL 8 : shim (RHSA-2021:1734)NessusRed Hat Local Security Checks
high
149601EulerOS 2.0 SP8 : grub2 (EulerOS-SA-2021-1875)NessusHuawei Local Security Checks
high
149593EulerOS 2.0 SP5 : grub2 (EulerOS-SA-2021-1900)NessusHuawei Local Security Checks
high
149217GLSA-202104-05 : GRUB: Multiple vulnerabilitiesNessusGentoo Local Security Checks
high
149104EulerOS 2.0 SP3 : grub2 (EulerOS-SA-2021-1794)NessusHuawei Local Security Checks
high
148618EulerOS Virtualization 2.9.1 : grub2 (EulerOS-SA-2021-1714)NessusHuawei Local Security Checks
high
148577EulerOS Virtualization 2.9.0 : grub2 (EulerOS-SA-2021-1741)NessusHuawei Local Security Checks
high
148339Photon OS 2.0: Grub2 PHSA-2021-2.0-0334NessusPhotonOS Local Security Checks
high
148284Photon OS 1.0: Grub2 PHSA-2021-1.0-0376NessusPhotonOS Local Security Checks
high
148045openSUSE Security Update : grub2 (openSUSE-2021-462)NessusSuSE Local Security Checks
high
148024Photon OS 4.0: Grub2 PHSA-2021-4.0-0001NessusPhotonOS Local Security Checks
high
147169Oracle Linux 8 : SUMM: / grub2 (ELSA-2021-0696)NessusOracle Linux Local Security Checks
high
147141Oracle Linux 7 : grub2 (ELSA-2021-0699)NessusOracle Linux Local Security Checks
high
147136Scientific Linux Security Update : grub2 on SL7.x x86_64 (2021:0699)NessusScientific Linux Local Security Checks
high
146996Photon OS 3.0: Grub2 PHSA-2021-3.0-0202NessusPhotonOS Local Security Checks
high
146989Oracle Linux 7 : grub2 (ELSA-2021-9076)NessusOracle Linux Local Security Checks
high
146988Oracle Linux 8 : grub2 (ELSA-2021-9077)NessusOracle Linux Local Security Checks
high
146986Debian DSA-4867-1 : grub2 - security updateNessusDebian Local Security Checks
high
146983SUSE SLED15 / SLES15 Security Update : grub2 (SUSE-SU-2021:0683-1)NessusSuSE Local Security Checks
high
146982SUSE SLES15 Security Update : grub2 (SUSE-SU-2021:0685-1)NessusSuSE Local Security Checks
high
146978SUSE SLES15 Security Update : grub2 (SUSE-SU-2021:0684-1)NessusSuSE Local Security Checks
high
146976SUSE SLES12 Security Update : grub2 (SUSE-SU-2021:0682-1)NessusSuSE Local Security Checks
high
146973SUSE SLES12 Security Update : grub2 (SUSE-SU-2021:0679-1)NessusSuSE Local Security Checks
high
146967SUSE SLES12 Security Update : grub2 (SUSE-SU-2021:0681-1)NessusSuSE Local Security Checks
high
146965CentOS 8 : grub2 (CESA-2021:0696)NessusCentOS Local Security Checks
high
146961RHEL 7 : grub2 (RHSA-2021:0699)NessusRed Hat Local Security Checks
high
146960RHEL 7 : grub2 (RHSA-2021:0700)NessusRed Hat Local Security Checks
high
146959RHEL 7 : grub2 (RHSA-2021:0701)NessusRed Hat Local Security Checks
high
146957RHEL 7 : grub2 (RHSA-2021:0703)NessusRed Hat Local Security Checks
high
146955RHEL 8 : grub2 (RHSA-2021:0696)NessusRed Hat Local Security Checks
high
146954RHEL 7 : grub2 (RHSA-2021:0702)NessusRed Hat Local Security Checks
high
146953RHEL 8 : grub2 (RHSA-2021:0697)NessusRed Hat Local Security Checks
high
146952RHEL 7 : grub2 (RHSA-2021:0704)NessusRed Hat Local Security Checks
high
146951RHEL 8 : grub2 (RHSA-2021:0698)NessusRed Hat Local Security Checks
high