What is the CVSS score of CVE-2020-37119?

CVE-2020-37119 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

Which versions of DNS are affected by CVE-2020-37119?

Nsauditor versions 3.0.28 and 3.2.1.0 contain a critical remote code execution vulnerability with a 9.8 CVSS score that allows attackers to execute arbitrary code through the DNS Lookup tool.

Is there a public PoC exploit available for CVE-2020-37119?

Yes, a public proof-of-concept exploit is available for CVE-2020-37119. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2020-37119?

Within 24 hours: Inventory all systems running Nsauditor 3.0.28 or 3.2.1.0 and assess whether they are network-accessible or used by untrusted users. Within 7 days: Implement network segmentation to restrict access to affected systems, disable the DNS Lookup tool if operationally feasible, and monitor for exploitation attempts. Within 30 days: Contact the vendor for patch availability, evaluate alternative DNS tools, or plan migration away from Nsauditor if no patch is released.

DNS CVE-2020-37119

CRITICAL

Stack-based Buffer Overflow (CWE-121)

2026-02-05 disclosure@vulncheck.com

DNS Buffer Overflow Nsauditor

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

PoC Detected

Feb 09, 2026 - 22:08 vuln.today

Public exploit code

CVE Published

Feb 05, 2026 - 17:16 nvd

CRITICAL 9.8

DescriptionCVE.org

Nsauditor 3.0.28 and 3.2.1.0 contains a buffer overflow vulnerability in the DNS Lookup tool that allows attackers to execute arbitrary code by overwriting memory. Attackers can craft a malicious DNS query payload to trigger a three-byte overwrite, bypass ASLR, and execute shellcode through a carefully constructed exploit.

AnalysisAI

Stack-based buffer overflow in Nsauditor Network Auditing Tool 3.0.28 and 3.2.1.0 in the DNS Lookup tool allows attackers to execute arbitrary code via crafted input. PoC available.

Technical ContextAI

CWE-121 stack overflow in Nsauditor's DNS Lookup tool. Oversized input to the DNS query field overwrites the stack frame, enabling control of the instruction pointer.

RemediationAI

Update Nsauditor to a patched version. Validate input length in DNS lookup fields.

CVE-2020-37119 vulnerability details – vuln.today

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DNS CVE-2020-37119

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Technical ContextAI

RemediationAI

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External POC / Exploit Code