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    Dashboard / CVE / CVE-2021-21557

    CVE-2021-21557

    Dell PowerEdge Server BIOS and select Dell Precision Rack BIOS contain an out-of-bounds array access vulnerability. A local malicious user with high privileges may potentially exploit this vulnerability, leading to a denial of service, arbitrary code execution, or information disclosure in System Management Mode.

    Published:Jun 14, 2021
    Last Modified:Nov 21, 2024
    EPS:Jun 14, 2021
    EPSS Score:0.00042
    CVSS Score:8.1

    Affected Products

    Vendor
    Dell
    Product
    Poweredge C4140
    Vendor
    Dell
    Product
    Poweredge C4140 Firmware
    Vendor
    Dell
    Product
    Poweredge C6420
    Vendor
    Dell
    Product
    Poweredge C6420 Firmware
    Vendor
    Dell
    Product
    Poweredge C6525
    Vendor
    Dell
    Product
    Poweredge C6525 Firmware
    Vendor
    Dell
    Product
    Poweredge Fc640
    Vendor
    Dell
    Product
    Poweredge Fc640 Firmware
    Vendor
    Dell
    Product
    Poweredge M640
    Vendor
    Dell
    Product
    Poweredge M640 Firmware
    Vendor
    Dell
    Product
    Poweredge M640p
    Vendor
    Dell
    Product
    Poweredge M640p Firmware
    Vendor
    Dell
    Product
    Poweredge Mx740c
    Vendor
    Dell
    Product
    Poweredge Mx740c Firmware
    Vendor
    Dell
    Product
    Poweredge Mx840c
    Vendor
    Dell
    Product
    Poweredge Mx840c Firmware
    Vendor
    Dell
    Product
    Poweredge R240
    Vendor
    Dell
    Product
    Poweredge R240 Firmware
    Vendor
    Dell
    Product
    Poweredge R340
    Vendor
    Dell
    Product
    Poweredge R340 Firmware
    Vendor
    Dell
    Product
    Poweredge R440
    Vendor
    Dell
    Product
    Poweredge R440 Firmware
    Vendor
    Dell
    Product
    Poweredge R540
    Vendor
    Dell
    Product
    Poweredge R540 Firmware
    Vendor
    Dell
    Product
    Poweredge R640
    Vendor
    Dell
    Product
    Poweredge R640 Firmware
    Vendor
    Dell
    Product
    Poweredge R6415
    Vendor
    Dell
    Product
    Poweredge R6415 Firmware
    Vendor
    Dell
    Product
    Poweredge R6515
    Vendor
    Dell
    Product
    Poweredge R6515 Firmware
    Vendor
    Dell
    Product
    Poweredge R6525
    Vendor
    Dell
    Product
    Poweredge R6525 Firmware
    Vendor
    Dell
    Product
    Poweredge R740
    Vendor
    Dell
    Product
    Poweredge R740 Firmware
    Vendor
    Dell
    Product
    Poweredge R740xd
    Vendor
    Dell
    Product
    Poweredge R740xd2
    Vendor
    Dell
    Product
    Poweredge R740xd2 Firmware
    Vendor
    Dell
    Product
    Poweredge R740xd Firmware
    Vendor
    Dell
    Product
    Poweredge R7415
    Vendor
    Dell
    Product
    Poweredge R7415 Firmware
    Vendor
    Dell
    Product
    Poweredge R7425
    Vendor
    Dell
    Product
    Poweredge R7425 Firmware
    Vendor
    Dell
    Product
    Poweredge R7515
    Vendor
    Dell
    Product
    Poweredge R7515 Firmware
    Vendor
    Dell
    Product
    Poweredge R7525
    Vendor
    Dell
    Product
    Poweredge R7525 Firmware
    Vendor
    Dell
    Product
    Poweredge R840
    Vendor
    Dell
    Product
    Poweredge R840 Firmware
    Vendor
    Dell
    Product
    Poweredge R940
    Vendor
    Dell
    Product
    Poweredge R940 Firmware
    Vendor
    Dell
    Product
    Poweredge R940xa
    Vendor
    Dell
    Product
    Poweredge R940xa Firmware
    Vendor
    Dell
    Product
    Poweredge T140
    Vendor
    Dell
    Product
    Poweredge T140 Firmware
    Vendor
    Dell
    Product
    Poweredge T340
    Vendor
    Dell
    Product
    Poweredge T340 Firmware
    Vendor
    Dell
    Product
    Poweredge T440
    Vendor
    Dell
    Product
    Poweredge T440 Firmware
    Vendor
    Dell
    Product
    Poweredge T640
    Vendor
    Dell
    Product
    Poweredge T640 Firmware
    Vendor
    Dell
    Product
    Poweredge Xr2
    Vendor
    Dell
    Product
    Poweredge Xr2 Firmware

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-10 Buffer Overflow via Environment Variables
    CAPEC-101 Server Side Include (SSI) Injection
    CAPEC-104 Cross Zone Scripting
    CAPEC-108 Command Line Execution through SQL Injection
    CAPEC-109 Object Relational Mapping Injection
    CAPEC-110 SQL Injection through SOAP Parameter Tampering
    CAPEC-120 Double Encoding
    CAPEC-13 Subverting Environment Variable Values
    CAPEC-135 Format String Injection
    CAPEC-136 LDAP Injection
    CAPEC-14 Client-side Injection-induced Buffer Overflow
    CAPEC-153 Input Data Manipulation
    CAPEC-182 Flash Injection
    CAPEC-209 XSS Using MIME Type Mismatch
    CAPEC-22 Exploiting Trust in Client
    CAPEC-23 File Content Injection
    CAPEC-230 Serialized Data with Nested Payloads
    CAPEC-231 Oversized Serialized Data Payloads
    CAPEC-24 Filter Failure through Buffer Overflow
    CAPEC-250 XML Injection
    CAPEC-261 Fuzzing for garnering other adjacent user/sensitive data
    CAPEC-267 Leverage Alternate Encoding
    CAPEC-28 Fuzzing
    CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters
    CAPEC-31 Accessing/Intercepting/Modifying HTTP Cookies
    CAPEC-42 MIME Conversion
    CAPEC-43 Exploiting Multiple Input Interpretation Layers
    CAPEC-45 Buffer Overflow via Symbolic Links
    CAPEC-46 Overflow Variables and Tags
    CAPEC-47 Buffer Overflow via Parameter Expansion
    CAPEC-473 Signature Spoof
    CAPEC-52 Embedding NULL Bytes
    CAPEC-53 Postfix, Null Terminate, and Backslash
    CAPEC-540 Overread Buffers
    CAPEC-588 DOM-Based XSS
    CAPEC-63 Cross-Site Scripting (XSS)
    CAPEC-64 Using Slashes and URL Encoding Combined to Bypass Validation Logic
    CAPEC-664 Server Side Request Forgery
    CAPEC-67 String Format Overflow in syslog()
    CAPEC-7 Blind SQL Injection
    CAPEC-71 Using Unicode Encoding to Bypass Validation Logic
    CAPEC-72 URL Encoding
    CAPEC-73 User-Controlled Filename
    CAPEC-78 Using Escaped Slashes in Alternate Encoding
    CAPEC-79 Using Slashes in Alternate Encoding
    CAPEC-8 Buffer Overflow in an API Call
    CAPEC-80 Using UTF-8 Encoding to Bypass Validation Logic
    CAPEC-81 Web Server Logs Tampering
    CAPEC-83 XPath Injection
    CAPEC-85 AJAX Footprinting
    CAPEC-88 OS Command Injection
    CAPEC-9 Buffer Overflow in Local Command-Line Utilities

    Related CVEs

    CVE-2025-26482 (CVSS 4.9) — Dell PowerEdge Server BIOS and Dell iDRAC9, all versions, contains an Information Disclosure vulnerability. A …
    CVE-2024-38304 (CVSS 3.8) — Dell PowerEdge Platform, 14G Intel BIOS version(s) prior to 2.22.x, contains an Access of Memory Location Afte…
    CVE-2024-38303 (CVSS 5.3) — Dell PowerEdge Platform, 14G Intel BIOS version(s) prior to 2.22.x, contains an Improper Input Validation vuln…
    CVE-2024-0172 (CVSS 7.9) — Dell PowerEdge Server BIOS and Dell Precision Rack BIOS contain an improper privilege management security vuln…
    CVE-2024-0173 (CVSS 3.8) — Dell PowerEdge Server BIOS and Dell Precision Rack BIOS contain an improper parameter initialization vulnerabi…
    CVE-2024-0154 (CVSS 3.8) — Dell PowerEdge Server BIOS and Dell Precision Rack BIOS contain an improper parameter initialization vulnerabi…
    CVE-2024-0161 (CVSS 7.2) — Dell PowerEdge Server BIOS and Dell Precision Rack BIOS contain an Improper SMM communication buffer verificat…
    CVE-2023-32460 (CVSS 8.8) — Dell PowerEdge BIOS contains an improper privilege management security vulnerability. An unauthenticated loca…
    CVE-2023-25537 (CVSS 6.1) — Dell PowerEdge 14G server BIOS versions prior to 2.18.1 and Dell Precision BIOS versions prior to 2.18.2, con…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High