CVE-2023-4398: Integer Overflow
First published: Tue Nov 28 2023(Updated: )
An integer overflow vulnerability in the source code of the QuickSec IPSec toolkit used in the VPN feature of the Zyxel ATP series firmware versions 4.32 through 5.37, USG FLEX series firmware versions 4.50 through 5.37, USG FLEX 50(W) series firmware versions 4.16 through 5.37, USG20(W)-VPN series firmware versions 4.16 through 5.37, and VPN series firmware versions 4.30 through 5.37, could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions on an affected device by sending a crafted IKE packet.
Credit: security@zyxel.com.tw
| Affected Software | Affected Version | How to fix |
|---|---|---|
| All of | ||
| Zyxel ZLD Firmware | >=4.32<=5.37 | |
| Any of | ||
| Zyxel ATP100 Firmware | ||
| Zyxel ATP100W Firmware | ||
| Zyxel ATP200 firmware | ||
| Zyxel ATP500 Firmware | ||
| Zyxel ATP700 Firmware | ||
| Zyxel ATP800 Firmware | ||
| All of | ||
| Zyxel ZLD Firmware | >=4.50<=5.37 | |
| Any of | ||
| Zyxel USG FLEX 100 | ||
| Zyxel USG FLEX 100w firmware | ||
| Zyxel USG FLEX 200 firmware | ||
| Zyxel USG FLEX 50 | ||
| Zyxel USG FLEX 500 firmware | ||
| Zyxel USG FLEX 50(W) series firmware | ||
| Zyxel USG FLEX 700 firmware | ||
| All of | ||
| Zyxel ZLD Firmware | >=4.16<=5.37 | |
| Any of | ||
| Zyxel USG20 | ||
| Zyxel VPN50 | ||
| All of | ||
| Zyxel ZLD Firmware | >=4.30<=5.37 | |
| Any of | ||
| Zyxel VPN100 Firmware | ||
| Zyxel VPN1000 Firmware | ||
| Zyxel Zywall VPN300 | ||
| Zyxel VPN50 Firmware |
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Reference Links
Frequently Asked Questions
What is CVE-2023-4398?
CVE-2023-4398 is an integer overflow vulnerability in the source code of the QuickSec IPSec toolkit used in the VPN feature of certain Zyxel ATP series firmware versions.
Which Zyxel products are affected by CVE-2023-4398?
Zyxel ATP series firmware versions 4.32 through 5.37, USG FLEX series firmware versions 4.50 through 5.37, USG FLEX 50(W) series firmware versions 4.16 through 5.37, and USG20(W)-VPN series firmware versions are affected.
What is the severity of CVE-2023-4398?
CVE-2023-4398 has a severity rating of 7.5 (high).
How can I fix CVE-2023-4398?
To fix CVE-2023-4398, update the firmware of the affected Zyxel products to versions 5.37 (for ATP series), 5.37 (for USG FLEX series), or 5.37 (for USG FLEX 50(W) series).
Where can I find more information about CVE-2023-4398?
You can find more information about CVE-2023-4398 in the Zyxel Security Advisory for Multiple Vulnerabilities in Firewalls and APs.
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- agent/software-canonical-lookup-request
- vendor/zyxel
- canonical/zyxel zld firmware
- version/zyxel zld firmware/4.32
- version/zyxel zld firmware/5.37
- canonical/zyxel atp100 firmware
- canonical/zyxel atp100w firmware
- canonical/zyxel atp200 firmware
- canonical/zyxel atp500 firmware
- canonical/zyxel atp700 firmware
- canonical/zyxel atp800 firmware
- version/zyxel zld firmware/4.50
- canonical/zyxel usg flex 100
- canonical/zyxel usg flex 100w firmware
- canonical/zyxel usg flex 200 firmware
- canonical/zyxel usg flex 50
- canonical/zyxel usg flex 500 firmware
- canonical/zyxel usg flex 50(w) series firmware
- canonical/zyxel usg flex 700 firmware
- version/zyxel zld firmware/4.16
- canonical/zyxel usg20
- canonical/zyxel vpn50
- version/zyxel zld firmware/4.30
- canonical/zyxel vpn100 firmware
- canonical/zyxel vpn1000 firmware
- canonical/zyxel zywall vpn300
- canonical/zyxel vpn50 firmware