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CVE-2020-5234— Untrusted data can lead to DoS attack in MessagePack for C# and Unity

Quick assessment

Affected
neuecc MessagePack
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.

MessagePack（C＃和Unity） 1.9.3之前版本和2.1.80之前版本中存在缓冲区错误漏洞。攻击者可利用该漏洞造成拒绝服务。

CVSS 4.8 · Medium EPSS 1.58% · P74

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2020-5234

Vulnerability Information
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Vulnerability Title
Untrusted data can lead to DoS attack in MessagePack for C# and Unity
Source: CVE Program / CVE List V5
Vulnerability Description
MessagePack for C# and Unity before version 1.9.11 and 2.1.90 has a vulnerability where untrusted data can lead to DoS attack due to hash collisions and stack overflow. Review the linked GitHub Security Advisory for more information and remediation steps.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/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
MessagePack 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MessagePack（C＃和Unity） 1.9.3之前版本和2.1.80之前版本中存在缓冲区错误漏洞。攻击者可利用该漏洞造成拒绝服务。
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
neuecc MessagePack < 1.9.11 -
neuecc MessagePack.ImmutableCollection < 1.9.11 -
neuecc MessagePack.ReactiveProperty < 1.9.11 -
neuecc MessagePack.UnityShims < 1.9.11 -

II. Public POCs for CVE-2020-5234

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2020-5234

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Patches & Fixes for CVE-2020-5234 (2)

Vendor Advisories for CVE-2020-5234 (1)

Other References for CVE-2020-5234 (1)

IV. Related Vulnerabilities

Same weakness: CWE-121

V. Comments for CVE-2020-5234

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