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CVE-2021-21419— Improper Handling of Highly Compressed Data (Data Amplification) and Memory Allocation with Excessive Size Value in eventlet

Quick assessment

Affected
eventlet eventlet
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.

Eventlet是Python的一个并发网络库。 Eventlet 0.31.0 之前版本存在资源管理错误漏洞，该漏洞源于一个websocket peer可能会通过发送非常大的websocket帧来耗尽Eventlet端的内存。

CVSS 5.3 · Medium EPSS 1.81% · P77

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2021-21419

Vulnerability Information
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Vulnerability Title
Improper Handling of Highly Compressed Data (Data Amplification) and Memory Allocation with Excessive Size Value in eventlet
Source: CVE Program / CVE List V5
Vulnerability Description
Eventlet is a concurrent networking library for Python. A websocket peer may exhaust memory on Eventlet side by sending very large websocket frames. Malicious peer may exhaust memory on Eventlet side by sending highly compressed data frame. A patch in version 0.31.0 restricts websocket frame to reasonable limits. As a workaround, restricting memory usage via OS limits would help against overall machine exhaustion, but there is no workaround to protect Eventlet process.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Eventlet 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Eventlet是Python的一个并发网络库。 Eventlet 0.31.0 之前版本存在资源管理错误漏洞，该漏洞源于一个websocket peer可能会通过发送非常大的websocket帧来耗尽Eventlet端的内存。
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
eventlet eventlet >= 0.10, < 0.31.0 -

II. Public POCs for CVE-2021-21419

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III. Intelligence Information for CVE-2021-21419

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Vendor Advisories for CVE-2021-21419 (1)

Mailing List Discussions for CVE-2021-21419 (2)

IV. Related Vulnerabilities

Same product: eventlet
Same vendor: eventlet
Same weakness: CWE-400

V. Comments for CVE-2021-21419

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