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CVE-2020-1921

Quick assessment

Affected
Facebook HHVM
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.

Katy Voor HHVM是 （Katy Voor）开源的一个应用软件。提供一个开放源代码的虚拟机，旨在执行用Hack编写的程序。 HHVM 存在安全漏洞，该漏洞源于crypt函数允许输入salt的大小为null终止缓冲区，而不验证偏移量是否在缓冲区内。以下产品及版本受到影响：HHVM versions prior to 4.56.3, all versions between 4.57.0 and 4.80.1, all versions between 4.81.0 and 4.93.1, and

AI Predicted 7.5 Difficulty: Easy EPSS 1.21% · P67
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I. Basic Information for CVE-2020-1921

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
In the crypt function, we attempt to null terminate a buffer using the size of the input salt without validating that the offset is within the buffer. This issue affects HHVM versions prior to 4.56.3, all versions between 4.57.0 and 4.80.1, all versions between 4.81.0 and 4.93.1, and versions 4.94.0, 4.95.0, 4.96.0, 4.97.0, 4.98.0.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
Katy Voor HHVM 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Katy Voor HHVM是 （Katy Voor）开源的一个应用软件。提供一个开放源代码的虚拟机，旨在执行用Hack编写的程序。 HHVM 存在安全漏洞，该漏洞源于crypt函数允许输入salt的大小为null终止缓冲区，而不验证偏移量是否在缓冲区内。以下产品及版本受到影响：HHVM versions prior to 4.56.3, all versions between 4.57.0 and 4.80.1, all versions between 4.81.0 and 4.93.1, and
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
Facebook HHVM 4.98.1 ~ unspecified -

II. Public POCs for CVE-2020-1921

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III. Intelligence Information for CVE-2020-1921

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Patches & Fixes for CVE-2020-1921 (1)

Security Blog Posts for CVE-2020-1921 (1)

Same Patch Batch · Facebook · 2021-03-10 · 7 CVEs total

CVE-2020-1916 Katy Voor HHVM 缓冲区错误漏洞
CVE-2020-1917 Katy Voor HHVM 缓冲区错误漏洞
CVE-2020-1918 Katy Voor HHVM 缓冲区错误漏洞
CVE-2020-1919 Katy Voor HHVM 缓冲区错误漏洞
CVE-2021-24025 Katy Voor HHVM 输入验证错误漏洞
CVE-2021-24030 Facebook Gameroom 参数注入漏洞

IV. Related Vulnerabilities

Same product: HHVM
Same vendor: Facebook
Same weakness: CWE-121

V. Comments for CVE-2020-1921

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