CVE-2021-40839
Quick assessment
Affected
n/a n/a
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Github rencode是encode 模块类似于 BitTorrent 项目中的 bencode。对于具有许多小元素的复杂异构数据结构，r 编码占用的空间明显少于 b 编码。 rencode package 1.0.6及之前版本存在安全漏洞，该漏洞源于设备允许在类型代码解码中无限循环，从而启用消耗 CPU 和内存的远程攻击。
Possible ATT&CK Techniques 1 AI
T1496 · Resource Hijacking
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I. Basic Information for CVE-2021-40839
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
The rencode package through 1.0.6 for Python allows an infinite loop in typecode decoding (such as via ;\x2f\x7f), enabling a remote attack that consumes CPU and memory.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Github rencode安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Github rencode是encode 模块类似于 BitTorrent 项目中的 bencode。对于具有许多小元素的复杂异构数据结构，r 编码占用的空间明显少于 b 编码。 rencode package 1.0.6及之前版本存在安全漏洞，该漏洞源于设备允许在类型代码解码中无限循环，从而启用消耗 CPU 和内存的远程攻击。
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 |
|---|---|---|---|---|
| - | n/a | n/a | - |
|
II. Public POCs for CVE-2021-40839
| # | POC Description | Source Link | Shenlong Link |
|---|---|---|---|
| 1 | Dirty Cow kernel exploit without libcrypt dependency | https://github.com/itlabbet/CVE-2021-40839 | POC Details |
AI-Generated POC
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Patches & Fixes for CVE-2021-40839 (2)
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https://github.com/aresch/rencode/pull/29 x_refsource_MISC
Vendor Advisories for CVE-2021-40839 (1)
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https://security.netapp.com/advisory/ntap-20211008-0001/ x_refsource_CONFIRM
Mailing List Discussions for CVE-2021-40839 (2)
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https://seclists.org/fulldisclosure/2021/Sep/16 x_refsource_MISC
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BMVQRPDVSVZNGGX57CFKCYT3DEYO4QB6/ vendor-advisory x_refsource_FEDORA
Other References for CVE-2021-40839 (1)
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https://pypi.org/project/rencode/#history x_refsource_MISC
Same Patch Batch · n/a · 2021-09-10 · 10 CVEs total
| CVE-2021-35976 | Plesk Obsidian 安全漏洞 | |
| CVE-2021-33011 | JTEKT TOYOPUC-Plus 安全漏洞 | |
| CVE-2021-40373 | playSMS代码注入漏洞 | |
| CVE-2021-37414 | Zoho ManageEngine DesktopCentral授权问题漏洞 | |
| CVE-2021-37423 | ZOHO ManageEngine ADSelfService Plus 安全漏洞 | |
| CVE-2021-37422 | ZOHO ManageEngine ADSelfService Plus SQL注入漏洞 | |
| CVE-2021-40864 | Ascensio System ONLYOFFICE Document Server 安全漏洞 | |
| CVE-2021-3145 | Ionic Identity Vault 授权问题漏洞 | |
| CVE-2021-40347 | GNU Mailman 访问控制错误漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2021-40839
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