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CVE-2019-19331

Quick assessment

Affected
CZ.NIC knot-resolver
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.

Knot Resolver是一款缓存DNS解析器实现，它包括解析器库和守护程序。 Knot Resolver 4.3.0之前版本中存在安全漏洞。攻击者可利用该漏洞造成拒绝服务。

AI Predicted 7.5 Difficulty: Easy EPSS 2.17% · P82
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I. Basic Information for CVE-2019-19331

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
knot-resolver before version 4.3.0 is vulnerable to denial of service through high CPU utilization. DNS replies with very many resource records might be processed very inefficiently, in extreme cases taking even several CPU seconds for each such uncached message. For example, a few thousand A records can be squashed into one DNS message (limit is 64kB).
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
Source: CVE Program / CVE List V5
Vulnerability Title
Knot Resolver 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Knot Resolver是一款缓存DNS解析器实现，它包括解析器库和守护程序。 Knot Resolver 4.3.0之前版本中存在安全漏洞。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
CZ.NIC knot-resolver 4.3.0 -

II. Public POCs for CVE-2019-19331

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III. Intelligence Information for CVE-2019-19331

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Vendor Advisories for CVE-2019-19331 (1)

Mailing List Discussions for CVE-2019-19331 (1)

Other References for CVE-2019-19331 (1)

IV. Related Vulnerabilities

Same product: knot-resolver
Same vendor: CZ.NIC
Same weakness: CWE-407

V. Comments for CVE-2019-19331

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