4.1

CVE-2026-63649: openvpn Permissive List of Allowed Inputs

CVSS: 4.1v4.0MediumAwaiting analysis
AliasesUBUNTU-CVE-2026-63649
Published 14-08-2026Last modified 17-08-2026
Open JSON

Vulnerability summary

CVE-2026-63649 is a medium (CVSS 4.1) Permissive List of Allowed Inputs vulnerability in openvpn. EPSS estimates a 0.33% chance of exploitation in the next 30 days, higher than 24.5% of scored vulnerabilities.

Overall risk
16/100
0100
Low · default modelHow is this calculated?
CVSS score
4.1/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.33%
0%100%
Low · +0.09 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 14-08-2026
    PublishedVulnerability first disclosed.
  2. 17-08-2026
    Last modifiedVulnerability information updated.

Description

The Windows interactive service in OpenVPN 2.4.0 through 2.6.21 and 2.7_alpha1 through 2.7.5 allows local authenticated users to bypass the trusted configuration directory constraint and load arbitrary configuration files via crafted options that bypass whitelist checks

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.33%

Chance of exploitation in the next 30 days

Percentile

25%

Versus all other CVEs

30-day change

+0.09 pp

From 0.24% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.33%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Openvpn1 product
  • openvpn≥ 2.4.0, < 2.6.22 | ≥ 2.7_alpha1, < 2.7.6
Ubuntu1 product
  • openvpnAll versions (No fix recorded)

2 vendors · 2 products

References

5 links