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CVE Record

CVE-2021-0099: Insufficient control flow management in the firmware for some Intel(R) Processors may allow an authenticate...

Insufficient control flow management in the firmware for some Intel(R) Processors may allow an authenticated user to potentially enable an escalation of privilege via local access.

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2021-0099 is a high-severity firmware issue in some Intel processors. A user who already has local authenticated access could potentially raise privileges on the affected system. This is mainly a risk for endpoints, servers, or appliances where untrusted or lower-privileged local users can run code.

Executive priority

Treat as a high-priority firmware remediation item, especially for servers, workstations, and appliances with multiple local users. It is less urgent than internet-facing remote code execution, but privilege escalation can materially increase impact after initial access.

Technical view

The CVE describes insufficient control flow management in firmware for some Intel processors. CVSS 3.1 is 7.8: local attack vector, low complexity, low privileges required, no user interaction, and high confidentiality, integrity, and availability impact.

Likely exposure

Exposure depends on whether systems use Intel processor firmware covered by Intel SA-00527 or related vendor advisories. The supplied bundle does not enumerate affected processor models, so teams must confirm exposure through Intel and hardware vendor guidance.

Exploitation context

The source bundle does not show CISA KEV listing or other evidence of active exploitation. The described attack requires local access and an authenticated user, so remote unauthenticated exploitation is not supported by the provided evidence.

Researcher notes

Key constraints are local access and prior authentication. The affected-version detail is not present in the supplied bundle beyond Intel’s advisory reference. Do not assume specific processor families or NetApp product exposure without confirming against the cited advisories.

Mitigation direction

  • Review Intel SA-00527 for affected processor and firmware details.
  • Obtain BIOS, UEFI, or firmware updates from the system OEM or vendor.
  • Review NetApp advisory NTAP-20220210-0007 where NetApp platforms are in use.
  • Prioritize shared systems and hosts allowing local low-privileged user access.
  • Track remediation through normal firmware maintenance and reboot windows.

Validation and detection

  • Inventory Intel CPU models and current BIOS or firmware versions.
  • Compare inventory against Intel SA-00527 and vendor advisories.
  • Confirm OEM firmware packages include the relevant Intel mitigation.
  • Check NetApp guidance for any applicable managed or appliance systems.
  • Document systems not listed in vendor scope as not currently evidenced affected.
Prepared
Confidence
medium
Sources
4

Public sources used

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

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2021-0099 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:L/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
3Source 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
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2021-0099Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/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/aIntel(R) ProcessorsSee referencesListed
Weakness

CWE details

No CWE listed

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