Critical severity · published Feb 5, 2026
CVE-2020-37119
Nsauditor 3.2.1.0 - Buffer Overflow (SEH+ASLR bypass (3 bytes overwrite))
9.8
CVSS
0.7%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 53% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NS
Nsauditor · Nsasoft
3.2.1.0; 3.0.28 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-37119
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-37119
Exploit
https://www.exploit-db.com/exploits/48350
Product
https://www.nsauditor.com/
Broken Link
https://www.vulncheck.com/advisories/nsauditor-buffer-overflow-sehaslr-bypass-bytes-overwrite
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