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CVE-2021-20330— Specific replication command with malformed oplog entries can crash secondaries

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 Server是美国Mongodb公司的一套开源的NoSQL数据库。该数据库提供面向集合的存储、动态查询、数据复制及自动故障转移等功能。 MongoDB Server 存在安全漏洞，对复制集合具有基本 CRUD 权限的攻击者可以使用特殊格式错误的 oplog 条目运行 applyOps 命令，从而导致对辅助节点的潜在拒绝服务。此问题影响 4.0.25 之前的 MongoDB Server v4.0 版本；MongoDB Server v4.2 4.2.14 之前的版本；4.4.6 之前的 M

CVSS 6.5 · Medium EPSS 1.05% · P63

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2021-20330

Vulnerability Information
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Vulnerability Title
Specific replication command with malformed oplog entries can crash secondaries
Source: CVE Program / CVE List V5
Vulnerability Description
An attacker with basic CRUD permissions on a replicated collection can run the applyOps command with specially malformed oplog entries, resulting in a potential denial of service on secondaries. This issue affects MongoDB Server v4.0 versions prior to 4.0.27; MongoDB Server v4.2 versions prior to 4.2.16; MongoDB Server v4.4 versions prior to 4.4.9.
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
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Mongodb Server 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mongodb Server是美国Mongodb公司的一套开源的NoSQL数据库。该数据库提供面向集合的存储、动态查询、数据复制及自动故障转移等功能。 MongoDB Server 存在安全漏洞，对复制集合具有基本 CRUD 权限的攻击者可以使用特殊格式错误的 oplog 条目运行 applyOps 命令，从而导致对辅助节点的潜在拒绝服务。此问题影响 4.0.25 之前的 MongoDB Server v4.0 版本；MongoDB Server v4.2 4.2.14 之前的版本；4.4.6 之前的 M
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 4.0 ~ 4.0.27 -

II. Public POCs for CVE-2021-20330

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III. Intelligence Information for CVE-2021-20330

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Other References for CVE-2021-20330 (1)

IV. Related Vulnerabilities

Same product: MongoDB Server
Same vendor: MongoDB Inc.
Same weakness: CWE-20

V. Comments for CVE-2021-20330

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