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CVE-2020-27779

A flaw was found in grub2 in versions prior to 2.06. The cutmem command does not honor secure boot locking allowing an privileged attacker to remove address ranges from memory creating an opportunity to circumvent SecureBoot protections after proper triage about grub's memory layout. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
7.5
CVSS
6.2
ShadowTrackr
NO
CISA KEV
-
NCSC.nl
CVSS v4.0 Metrics
Exploitability
Attack VectorLocal
ComplexityHigh
RequirementsPresent
PrivilegesHigh
User InteractionNone
Threat
Exploit MaturityPoC
Vulnerable System
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Subsequent System
ConfidentialityNone
IntegrityNone
AvailabilityNone
Supplemental
SafetyNegligible
AutomatableYes
RecoveryAutomatic
Value DensityConcentrated
UrgencyMedium
Patch StatusUnavailable

Change Log
DateSourceChangesScore
2026-07-21PoCE: U→P4.0 → 6.2
2026-07-21nvdAV: P→L, UI: A→N, VC: N→H, VI: N→H, VA: N→H0.0 → 4.0
2026-07-21cve.orginitial, patch: Unavailable0.0
References: CVE.org · NVD · PoC

Affected Software
VendorProductVersion
fedoraprojectfedora33
fedoraprojectfedora34
gnugrub2≤ 2.06
n/agrub2grub 2.06
netappontap_select_deploy_administration_utilityAll versions
redhatenterprise_linux7.0
redhatenterprise_linux8.0
redhatenterprise_linux_server_aus7.2
redhatenterprise_linux_server_aus7.3
redhatenterprise_linux_server_aus7.4
redhatenterprise_linux_server_aus7.6
redhatenterprise_linux_server_aus7.7
redhatenterprise_linux_server_aus8.2
redhatenterprise_linux_server_eus7.6
redhatenterprise_linux_server_eus7.7
redhatenterprise_linux_server_eus8.1
redhatenterprise_linux_server_tus7.4
redhatenterprise_linux_server_tus7.6
redhatenterprise_linux_server_tus7.7
redhatenterprise_linux_server_tus8.2
redhatenterprise_linux_workstation7.0
Published: 2021-03-03