CVE-2019-25572 — NordVPN 6

NordVPN 6.19.6 contains a denial of service vulnerability that allows local attackers to crash the application by submitting an excessively long string in the email input field. Attackers can paste a buffer of 100,000 characters into the email field during login to trigger an app

01What is this vulnerability?

NordVPN 6.19.6 contains a denial of service vulnerability that allows local attackers to crash the application by submitting an excessively long string in the email input field. Attackers can paste a buffer of 100,000 characters into the email field during login to trigger an application crash.

02Affected products

No structured affected-product list available — see references below for vendor advisories.

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2026-03-21T13:16:21.200
• Last modified: 2026-10-07T08:10:00.200

09References

• downloads.nordcdn.com — https://downloads.nordcdn.com/apps/windows/10/NordVPN/latest/NordVPNSetup.exe
• nordvpn.com — https://nordvpn.com/
• www.exploit-db.com — https://www.exploit-db.com/exploits/46343
• www.vulncheck.com — https://www.vulncheck.com/advisories/nordvpn-denial-of-service-via-email-field-b…