Buffer Overflow Vulnerability in Dnsmasq-utils by Dnsmasq
CVE-2020-37127

6.9MEDIUM

Key Information:

Vendor

Dnsmasq

Status
Dnsmasq-utils
Vendor
CVE Published:
5 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2020-37127?

Dnsmasq-utils version 2.79-1 contains a buffer overflow vulnerability in the dhcp_release utility. This flaw allows attackers to send carefully crafted input exceeding 16 characters, leading to a denial of service. By triggering a core dump, the dhcp_release process can be terminated, potentially disrupting network operations.

Affected Version(s)

dnsmasq-utils 2.79

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2020-37127 - Proof of Concept

References

https://www.exploit-db.com/exploits/48301
exploit
https://launchpad.net/ubuntu/+source/dnsmasq/2.79-1
product
https://www.vulncheck.com/advisories/dnsmasq-utils-dhcpre...
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Josue Encinar
.