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Latitude 5300 2 In 1 Firmware CVE-2021-36283

MEDIUM
Improper Input Validation (CWE-20)
2021-09-28 security_alert@emc.com
RCE Dell Latitude 5300 2 In 1 Firmware Latitude 5310 Firmware Latitude 5310 2 In 1 Firmware Latitude 5400 Firmware Latitude 5401 Firmware Latitude 5410 Firmware Latitude 5411 Firmware Latitude 5500 Firmware Latitude 5511 Firmware Latitude 7200 2 In 1 Firmware Chengming 3990 Firmware Chengming 3991 Firmware Latitude 7210 2 In 1 Firmware Latitude 7300 Firmware Latitude 7310 Firmware Latitude 7400 Firmware Latitude 7400 2 In 1 Firmware Latitude 7410 Firmware Latitude 9410 Firmware Precision 5540 Firmware Precision 5550 Firmware Precision 5750 Firmware Precision 7540 Firmware Precision 7550 Firmware Precision 7740 Firmware Precision 7750 Firmware Inspiron 3501 Firmware Inspiron 3880 Firmware Inspiron 3881 Firmware Optiplex 3080 Firmware Optiplex 5080 Firmware Optiplex 7080 Firmware Vostro 3401 Firmware Vostro 3501 Firmware Vostro 3681 Firmware Vostro 3881 Firmware Vostro 3888 Firmware Latitude 3310 Firmware Latitude 3310 2 In 1 Firmware Latitude 5300 Firmware Inspiron 7501 Firmware Inspiron 7500 Firmware Wyse 5470 Firmware Vostro 7500 Firmware Precision 3440 Firmware Precision 3540 Firmware Precision 3541 Firmware Precision 3550 Firmware Precision 3551 Firmware Xps 13 9300 Firmware Xps 17 9700 Firmware G3 15 3590 Firmware Inspiron 3493 Firmware Inspiron 3593 Firmware Inspiron 3793 Firmware Inspiron 5493 Firmware Inspiron 5498 Firmware Inspiron 5590 Firmware Inspiron 5593 Firmware Inspiron 5598 Firmware Inspiron 7590 Firmware Inspiron 7591 Firmware Latitude 7220Ex Rugged Extreme Tablet Firmware Vostro 5490 Firmware Vostro 5590 Firmware Vostro 7590 Firmware Xps 13 9380 Firmware G3 15 3500 Firmware Inspiron 7391 2 In 1 Firmware Latitude 9510 Firmware Optiplex 3280 Aio Firmware Optiplex 5480 Aio Firmware Optiplex 7480 Aio Firmware Optiplex 7780 Aio Firmware Precision 3640 Tower Firmware Vostro 3491 Firmware Vostro 3591 Firmware Xps 7380 Firmware Xps 7390 2 In 1 Firmware Xps 7590 Firmware Inspiron 5400 2 In 1 Firmware G3 15 5500 Firmware Inspiron 5490 Firmware Inspiron 7500 2 In 1 Silver Firmware Xps 9500 Firmware
6.7
CVSS 3.1 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-20
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V2 - Validation and Business Logic Input validation, allowlisting
Impact

CVSS score of 6.7 (MEDIUM). Attack characteristics: local attack vector, low complexity, high privileges required, no user interaction not required.
Exploit ScenarioDerived

Successful exploitation could compromise the medium-severity affected system.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.2% exploitation probability (EPSS)

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AnalysisAI

Dell BIOS contains an improper input validation vulnerability. Rated medium severity (CVSS 6.7), this vulnerability is low attack complexity.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

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Technical ContextAI · show details

This vulnerability is classified under CWE-20. Dell BIOS contains an improper input validation vulnerability. A local authenticated malicious user may potentially exploit this vulnerability by using an SMI to gain arbitrary code execution in SMRAM. Affected products include: Dell Chengming 3990 Firmware, Dell Chengming 3991 Firmware, Dell G3 15 3500 Firmware, Dell G3 15 3590 Firmware, Dell G3 15 5500 Firmware.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 6.7 MEDIUM
AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

DescriptionNVD

Dell BIOS contains an improper input validation vulnerability. A local authenticated malicious user may potentially exploit this vulnerability by using an SMI to gain arbitrary code execution in SMRAM.

Threat Intelligence Overview

EPSS Score
0.2%
Top 85% exploitable
Data Quality
2 sources
Confidence: Low
NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.2%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Defer
Exploitation· derived
None
System Exposure· derived
Small
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

34
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +34
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Remote Code Execution CRITICAL

Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.

Affected Products (CPE)NVD

cpe:2.3:o:dell:chengming_3990_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:chengming_3991_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:g3_15_3500_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:g3_15_3590_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:g3_15_5500_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_3493_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_3501_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_3593_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_3793_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_3880_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_3881_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5400_2-in-1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5490_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5493_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5498_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5590_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5593_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5598_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_7391_2-in-1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_7500_firmware:*:*:*:*:*:*:*:*
+ 65 more

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Same weakness CWE-20 – Improper Input Validation

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CVE-2021-44228 CRITICAL POC
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CVE-2024-3400 CRITICAL POC
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CVE-2022-47966 CRITICAL POC
9.8
CVE-2023-22515 CRITICAL POC
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CVE-2009-0927 HIGH POC
8.8
CVE-2017-9791 CRITICAL POC
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CVE-2017-15944 CRITICAL POC
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CVE-2019-0604 CRITICAL POC
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Same technique RCE

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CVE-2017-7269 CRITICAL POC
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CVE-2012-4681 CRITICAL POC
9.8
CVE-2023-3519 CRITICAL POC
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CVE-2015-5119 CRITICAL POC
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CVE-2016-4117 CRITICAL POC
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CVE-2015-3113 CRITICAL POC
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References

Advisories & patches
PATCH https://www.dell.com/support/kbdoc/000191495/

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