CVE-2020-37119

CRITICAL
2026-02-05 [email protected]
9.8
CVSS 3.1
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CVSS Vector

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

3
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

Tags

Dns Buffer Overflow Nsauditor

Description

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.

Analysis

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 Context

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.

Affected Products

['Nsauditor 3.0.28', 'Nsauditor 3.2.1.0']

Remediation

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

Priority Score

69
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +49
POC: +20

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CVE-2020-37119 vulnerability details – vuln.today
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