CVE-2019-25572Public exploit

Application crash via oversized login email input

Published Mar 21, 2026 · Updated Mar 21, 2026

Denial of service in NordVPN 6.19.6 for Windows allows local users to crash the application via an oversized login email value. The login form accepts a pasted 100,000-character string in the email field and processes it without an effective length bound, terminating the client. Access to the local Windows login interface is required; the documented consequence is a client crash, not data disclosure or modification.

CVSS severity6.9
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in NordVPN 6.19.6 for Windows allows local users to crash the application via an oversized login email value. The login form accepts a pasted 100,000-character string in the email field and processes it without an effective length bound, terminating the client. Access to the local Windows login interface is required; the documented consequence is a client crash, not data disclosure or modification.

The record

CVE
CVE-2019-25572
Published
Mar 21, 2026
Updated
Mar 21, 2026
Vendor
nordvpn S.A.
Product
NordVPN
Classifications
CWE-1260, T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.19.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

nordvpn S.A. · NordVPNversion=6.19.6

Published CVSS scores

6.9VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
6.2VulnCheckCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1260Improper Handling of Overlap Between Protected Memory Ranges
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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