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CVE Record

CVE-2015-8370: Multiple integer underflows in Grub2 1.98 through 2.02 allow physically proximate attackers to bypass authe...

Multiple integer underflows in Grub2 1.98 through 2.02 allow physically proximate attackers to bypass authentication, obtain sensitive information, or cause a denial of service (disk corruption) via backspace characters in the (1) grub_username_get function in grub-core/normal/auth.c or the (2) grub_password_get function in lib/crypto.c, which trigger an "Off-by-two" or "Out of bounds overwrite" memory error.

HighCVSS 7.4Not KEV-listedUpdated
Glexia's TakeAutomated analysis

Security readout for executives and security teams

This flaw lets someone with local physical or console access bypass GRUB2 boot authentication on affected systems. For executives, the main risk is loss of control over systems where bootloader passwords protect sensitive data or administrative access. It is not described as a remote network attack. Exposure is most likely on Linux or Unix-like systems using affected GRUB2 versions with bootloader authentication enabled, especially servers, kiosks, laptops, lab machines, or virtual consoles where untrusted users can reach the boot prompt. Treat this as high priority for systems where physical or console access is plausible. It is less urgent for tightly controlled infrastructure without console exposure, but still warrants patching because boot authentication is a security boundary. Mitigation focus: Apply the relevant GRUB2 update from the operating-system vendor advisory.; Prioritize systems where attackers can access keyboard, console, or hypervisor boot screens.; Restrict physical and remote-console access until vendor remediation is verified..

Prepared

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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ATT&CK lookup starting points

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cwe · low confidence lookup

CWE-191: Exact CWE lookup

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cve · low confidence lookup

CVE-2015-8370 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.4 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.4CVSS 3.1HighCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H1.45.9Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

7.4High
CVSS 3.1 vector shape for CVE-2015-8370Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-191 · source CWE mapping

Integer Underflow (Wrap or Wraparound)

Integer Underflow (Wrap or Wraparound) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.