8.1
HIGH
CVE-2021-21557
Dell PowerEdge Server and Dell Precision Rack BIOS Array Out-of-Bounds Vulnerability
Description

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.

INFO

Published Date :

June 14, 2021, 7:15 p.m.

Last Modified :

Oct. 25, 2022, 11:43 p.m.

Source :

[email protected]

Remotely Exploitable :

No

Impact Score :

6.0

Exploitability Score :

1.5
Affected Products

The following products are affected by CVE-2021-21557 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Dell poweredge_r6515_firmware
2 Dell poweredge_r6525_firmware
3 Dell poweredge_r7515_firmware
4 Dell poweredge_r7525_firmware
5 Dell poweredge_c6525_firmware
6 Dell poweredge_r640_firmware
7 Dell poweredge_r740_firmware
8 Dell poweredge_r740xd_firmware
9 Dell poweredge_r940_firmware
10 Dell poweredge_r840_firmware
11 Dell poweredge_r940xa_firmware
12 Dell poweredge_mx740c_firmware
13 Dell poweredge_mx840c_firmware
14 Dell poweredge_t640_firmware
15 Dell poweredge_r540_firmware
16 Dell poweredge_r440_firmware
17 Dell poweredge_t440_firmware
18 Dell poweredge_xr2_firmware
19 Dell poweredge_r740xd2_firmware
20 Dell poweredge_c6420_firmware
21 Dell poweredge_fc640_firmware
22 Dell poweredge_m640_firmware
23 Dell poweredge_m640p_firmware
24 Dell poweredge_c4140_firmware
25 Dell poweredge_t140_firmware
26 Dell poweredge_t340_firmware
27 Dell poweredge_r240_firmware
28 Dell poweredge_r340_firmware
29 Dell poweredge_r6415_firmware
30 Dell poweredge_r7415_firmware
31 Dell poweredge_r7425_firmware
: Total Affected Vendor : 1 | Products : 31
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-21557.

URL Resource
https://www.dell.com/support/kbdoc/000187958 Patch Vendor Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-21557 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-21557 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Reanalysis by [email protected]

    Oct. 25, 2022

    Action Type Old Value New Value
    Removed CWE NIST CWE-119
    Added CWE NIST CWE-125
  • Initial Analysis by [email protected]

    Jun. 23, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:L/AC:L/Au:N/C:C/I:C/A:C)
    Added CVSS V3.1 NIST AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
    Changed Reference Type https://www.dell.com/support/kbdoc/000187958 No Types Assigned https://www.dell.com/support/kbdoc/000187958 Patch, Vendor Advisory
    Added CWE NIST CWE-119
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_r640_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.11.2 OR cpe:2.3:h:dell:poweredge_r640:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_r740_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.11.2 OR cpe:2.3:h:dell:poweredge_r740:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_r740xd_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.11.2 OR cpe:2.3:h:dell:poweredge_r740xd:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_r940_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.11.2 OR cpe:2.3:h:dell:poweredge_r940:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_r540_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.11.2 OR cpe:2.3:h:dell:poweredge_r540:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_r440_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.11.2 OR cpe:2.3:h:dell:poweredge_r440:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_t440_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.11.2 OR cpe:2.3:h:dell:poweredge_t440:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_xr2_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.11.2 OR cpe:2.3:h:dell:poweredge_xr2:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_r740xd2_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.11.2 OR cpe:2.3:h:dell:poweredge_r740xd2:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_r840_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.11.2 OR cpe:2.3:h:dell:poweredge_r840:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_r940xa_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.11.2 OR cpe:2.3:h:dell:poweredge_r940xa:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_t640_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.11.2 OR cpe:2.3:h:dell:poweredge_t640:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_c6420_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.11.2 OR cpe:2.3:h:dell:poweredge_c6420:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_fc640_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.11.2 OR cpe:2.3:h:dell:poweredge_fc640:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_m640_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.11.2 OR cpe:2.3:h:dell:poweredge_m640:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_m640p_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.11.2 OR cpe:2.3:h:dell:poweredge_m640p:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_mx740c_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.11.2 OR cpe:2.3:h:dell:poweredge_mx740c:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_mx840c_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.11.2 OR cpe:2.3:h:dell:poweredge_mx840c:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_c4140_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.11.2 OR cpe:2.3:h:dell:poweredge_c4140:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_t140_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.5.1 OR cpe:2.3:h:dell:poweredge_t140:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_t340_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.5.1 OR cpe:2.3:h:dell:poweredge_t340:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_r240_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.5.1 OR cpe:2.3:h:dell:poweredge_r240:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_r340_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.5.1 OR cpe:2.3:h:dell:poweredge_r340:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_r6415_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.16.1 OR cpe:2.3:h:dell:poweredge_r6415:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_r7415_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.16.1 OR cpe:2.3:h:dell:poweredge_r7415:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_r7425_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.16.1 OR cpe:2.3:h:dell:poweredge_r7425:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_r6515_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.2.4 OR cpe:2.3:h:dell:poweredge_r6515:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_r7515_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.2.4 OR cpe:2.3:h:dell:poweredge_r7515:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_r6525_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.2.5 OR cpe:2.3:h:dell:poweredge_r6525:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_r7525_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.2.5 OR cpe:2.3:h:dell:poweredge_r7525:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:dell:poweredge_c6525_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.2.4 OR cpe:2.3:h:dell:poweredge_c6525:-:*:*:*:*:*:*:*
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-21557 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-21557 weaknesses.

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

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.04 }} 0.00%

score

0.10264

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
: