CVE-2026-84471Network attack vectorHinoki check available

Authenticated crash or disclosure via TLS buffer double-free

Published Oct 14, 2026 · Updated Oct 14, 2026

Double-free in OpenVPN TLS session handling allows remote authenticated users to crash the service or read memory via crafted packets. The incomplete check_session_buf_not_used() guard leaves output-buffer aliases referencing freed TLS storage during retiring-key cleanup. Affected releases are 2.6.0 through 2.6.22 and 2.7_alpha1 through 2.7.6; exploitation requires TLS session promotion or expiry.

CVSS severity5.9
Medium
EPSS probability0.41%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Double-free in OpenVPN TLS session handling allows remote authenticated users to crash the service or read memory via crafted packets. The incomplete check_session_buf_not_used() guard leaves output-buffer aliases referencing freed TLS storage during retiring-key cleanup. Affected releases are 2.6.0 through 2.6.22 and 2.7_alpha1 through 2.7.6; exploitation requires TLS session promotion or expiry.

The record

CVE
CVE-2026-84471
Published
Oct 14, 2026
Updated
Oct 14, 2026
Vendor
OpenVPN Technologies, Inc.
Product
OpenVPN
Classifications
T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 14, 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=2.6.0 <=2.6.22
  2. Affected versionversion=2.7_alpha1 <=2.7.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenVPN Technologies, Inc. · OpenVPNversion=2.6.0 <=2.6.22; version=2.7_alpha1 <=2.7.7

Published CVSS scores

9.0TenableCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:U/RC:C
9.8TenableCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
5.9Amazon LinuxCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5TenableAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8TenableCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

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