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CVE-2021-21317— Denial of Service in uap-core

Quick assessment

Affected
ua-parser uap-core
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.

Uap-core中存在资源管理错误漏洞，该漏洞源于网络系统或产品对系统资源（如内存、磁盘空间、文件等）的管理不当。

CVSS 5.3 · Medium EPSS 2.52% · P84
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I. Basic Information for CVE-2021-21317

Vulnerability Information
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Vulnerability Title
Denial of Service in uap-core
Source: CVE Program / CVE List V5
Vulnerability Description
uap-core in an open-source npm package which contains the core of BrowserScope's original user agent string parser. In uap-core before version 0.11.0, some regexes are vulnerable to regular expression denial of service (REDoS) due to overlapping capture groups. This allows remote attackers to overload a server by setting the User-Agent header in an HTTP(S) request to maliciously crafted long strings. This is fixed in version 0.11.0. Downstream packages such as uap-python, uap-ruby etc which depend upon uap-core follow different version schemes.
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
Uap-core 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Uap-core中存在资源管理错误漏洞，该漏洞源于网络系统或产品对系统资源（如内存、磁盘空间、文件等）的管理不当。
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
ua-parser uap-core < 0.11.0 -

II. Public POCs for CVE-2021-21317

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III. Intelligence Information for CVE-2021-21317

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Patches & Fixes for CVE-2021-21317 (1)

Vendor Advisories for CVE-2021-21317 (1)

Other References for CVE-2021-21317 (1)

IV. Related Vulnerabilities

Same product: uap-core
Same vendor: ua-parser
Same weakness: CWE-400

V. Comments for CVE-2021-21317

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