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CVE-2021-32040— Large aggregation pipelines with a specific stage can crash mongod under default configuration

Quick assessment

Affected
MongoDB Inc. MongoDB Server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MongoDB是美国MongoDB公司的一种面向文档的数据库管理系统。 MongoDB存在安全漏洞，该漏洞源于stage使用的堆栈帧的大小导致堆栈溢出。以下产品及版本受到影响：MongoDB 5.0.4之前版本、4.4.11之前版本、4.2.16之前版本。

CVSS 6.5 · Medium EPSS 2.02% · P79
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I. Basic Information for CVE-2021-32040

Vulnerability Information
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Vulnerability Title
Large aggregation pipelines with a specific stage can crash mongod under default configuration
Source: CVE Program / CVE List V5
Vulnerability Description
It may be possible to have an extremely long aggregation pipeline in conjunction with a specific stage/operator and cause a stack overflow due to the size of the stack frames used by that stage. If an attacker could cause such an aggregation to occur, they could maliciously crash MongoDB in a DoS attack. This vulnerability affects MongoDB Server v4.4 versions prior to and including 4.4.28, MongoDB Server v5.0 versions prior to 5.0.4 and MongoDB Server v4.2 versions prior to 4.2.16. Workaround: >= v4.2.16 users and all v4.4 users can add the --setParameter internalPipelineLengthLimit=50 instead of the default 1000 to mongod at startup to prevent a crash.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
MongoDB 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MongoDB是美国MongoDB公司的一种面向文档的数据库管理系统。 MongoDB存在安全漏洞，该漏洞源于stage使用的堆栈帧的大小导致堆栈溢出。以下产品及版本受到影响：MongoDB 5.0.4之前版本、4.4.11之前版本、4.2.16之前版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
MongoDB Inc. MongoDB Server 5.0 ~ 5.0.4 -

II. Public POCs for CVE-2021-32040

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III. Intelligence Information for CVE-2021-32040

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Vendor Advisories for CVE-2021-32040 (1)

Other References for CVE-2021-32040 (3)

IV. Related Vulnerabilities

Same product: MongoDB Server
Same vendor: MongoDB Inc.
Same weakness: CWE-121

V. Comments for CVE-2021-32040

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