What is CVE-2025-59691?

CVE-2025-59691 is a low-severity vulnerability in Purevpn, classified under Incorrect Resource Transfer Between Spheres. CVSS score: 3.7/10. Published 2025-09-18.

How severe is CVE-2025-59691?

Low severity. CVSS v3 base score is 3.7 out of 10.

Is CVE-2025-59691 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Purevpn

CVE-2025-59691

PureVPN client applications on Linux through September 2025 allow IPv6 traffic to leak outside the VPN tunnel upon network events such as Wi-Fi reconnect or system resume. In the CLI client, the VPN auto-reconnects and claims to be connected, but IPv6 traffic is no longer routed or blocked. In the GUI client, the IPv6 connection remains functional after disconnection until the user clicks Reconnect. In both cases, the real IPv6 address is exposed to external services, violating user privacy and defeating the advertised IPv6 leak protection. This affects CLI 2.0.1 and GUI 2.10.0.

EPSS: 0.002 (10.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Purevpn — versions CLI 2.0.1, GUI 2.10.0

Weakness classification (CWE)

CWE-669 — Incorrect Resource Transfer Between Spheres

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

cve@mitre.org

Frequently asked questions

What is CVE-2025-59691?: CVE-2025-59691 is a low-severity vulnerability in Purevpn, classified under Incorrect Resource Transfer Between Spheres. CVSS score: 3.7/10. Published 2025-09-18.
How severe is CVE-2025-59691?: Low severity. CVSS v3 base score is 3.7 out of 10.
Is CVE-2025-59691 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.