CVE-2024-1305

Kernel code execution via unchecked length addition

Published Jul 8, 2024 · Updated Aug 23, 2024

Integer overflow in TAP-Windows6 9.26 and earlier allows local users to crash Windows or execute code in kernel space via crafted writes. TapSharedSendPacket adds attacker-controlled PacketLength and PrefixLength values without checking for 32-bit overflow, allocates an undersized buffer, and then overflows it. Reachability requires access to issue a write to the installed TAP device; OpenVPN GUI 2.6.9 and earlier is affected through its bundled tap-windows6 module.

CVSS severity9.8
Critical
EPSS probability15.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in TAP-Windows6 9.26 and earlier allows local users to crash Windows or execute code in kernel space via crafted writes. TapSharedSendPacket adds attacker-controlled PacketLength and PrefixLength values without checking for 32-bit overflow, allocates an undersized buffer, and then overflows it. Reachability requires access to issue a write to the installed TAP device; OpenVPN GUI 2.6.9 and earlier is affected through its bundled tap-windows6 module.

The record

CVE
CVE-2024-1305
Published
Jul 8, 2024
Updated
Aug 23, 2024
Vendor
OpenVPN Inc.
Product
OpenVPN GUI
Classifications
CWE-190, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 8, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 23, 2024Record 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=0 <=2.6.9
  2. Affected versionversion=2.6.9 and earlier

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

OpenVPN Inc. · OpenVPN GUIversion=0 <=2.6.9; version=2.6.9 and earlier
OpenVPN Inc. · TAP-Windows6version=0 <=9.26; version=9.26 or earlier

Published CVSS scores

9.8CISA-ADPCVSS: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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1068Exploitation for Privilege Escalation

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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Your stack

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