Denial of Service Vulnerability in Nord VPN by Nord Security
CVE-2018-25368

8.7HIGH

Key Information:

Vendor

Nordvpn

Status
Nordvpn
Vendor
CVE Published:
25 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2018-25368?

Nord VPN version 6.14.31 is susceptible to a denial of service vulnerability that can be exploited by attackers without authentication. This vulnerability arises when an attacker inputs an excessively long string into the password field, leading to an application crash during authentication attempts. By submitting a buffer of repeated characters, attackers can disrupt the normal operation of the application, creating potential service downtime for users.

Affected Version(s)

NordVPN 0 <= 6.14.31

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-2018-25368 - Proof of Concept

References

https://www.exploit-db.com/exploits/45304
exploit
https://nordvpn.com/download/
product
https://www.vulncheck.com/advisories/nord-vpn-denial-of-s...
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
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

L0RD (borna nematzadeh)
.