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 1. Home
 2. Support Overview
 3. Security Advisories
 4. Zyxel security advisory for multiple vulnerabilities in firewalls and APs


ZYXEL SECURITY ADVISORY FOR MULTIPLE VULNERABILITIES IN FIREWALLS AND APS

CVES: CVE-2023-6397, CVE-2023-6398, CVE-2023-6399, CVE-2023-6764

SUMMARY

Zyxel has released patches addressing multiple vulnerabilities in some firewall
and access point (AP) versions. Users are advised to install the patches for
optimal protection.

WHAT ARE THE VULNERABILITIES?

CVE-2023-6397

A null pointer dereference vulnerability in some firewall versions could allow a
LAN-based attacker to cause denial-of-service (DoS) conditions by downloading a
crafted RAR compressed file onto a LAN-side host if the firewall has the
“Anti-Malware” feature enabled.

CVE-2023-6398

A post-authentication command injection vulnerability in the file upload binary
in some firewall and AP versions could allow an authenticated attacker with
administrator privileges to execute some operating system (OS) commands on an
affected device via FTP.

CVE-2023-6399

A format string vulnerability in some firewall versions could allow an
authenticated IPSec VPN user to cause DoS conditions against the “deviceid”
daemon by sending a crafted hostname to an affected device if it has the “Device
Insight” feature enabled.

CVE-2023-6764

A format string vulnerability in a function of the IPSec VPN feature in some
firewall versions could allow an attacker to achieve unauthorized remote code
execution by sending a sequence of specially crafted payloads containing an
invalid pointer; however, such an attack would require detailed knowledge of an
affected device’s memory layout and configuration.

WHAT VERSIONS ARE VULNERABLE—AND WHAT SHOULD YOU DO?

After a thorough investigation, we have identified the vulnerable products that
are within their vulnerability support period and released updates to address
the vulnerabilities, as shown in the following tables.


Table 1. Firewalls affected by CVE-2023-6397, CVE-2023-6398, CVE-2023-6399, and
CVE-2023-6764

Firewall series Affected version Patch availability CVE-2023-6397 CVE-2023-6398
CVE-2023-6399 CVE-2023-6764 ATP ZLD V4.32 to V5.37 Patch 1 ZLD V4.32 to V5.37
Patch 1 ZLD V5.10 to V5.37 Patch 1 ZLD V4.32 to V5.37 Patch 1 ZLD V5.37 Patch 2
USG FLEX ZLD V4.50 to V5.37 Patch 1 ZLD V4.50 to V5.37 Patch 1 ZLD V5.10 to
V5.37 Patch 1 ZLD V4.50 to V5.37 Patch 1 ZLD V5.37 Patch 2 USG FLEX
50(W)/USG20(W)-VPN Not affected ZLD V4.16 to V5.37 Patch 1 ZLD V5.10 to V5.37
Patch 1 ZLD V4.16 to V5.37 Patch 1 ZLD V5.37 Patch 2 USG FLEX H Not affected uOS
V1.10 to V1.10 Patch 1 uOS V1.10 to V1.10 Patch 1 Not affected Hotfix is
available*
Standard patch uOS V1.20 in April 2024


Table 2. APs affected by CVE-2023-6398

AP model Affected version Patch availability NWA50AX 6.29(ABYW.3) and earlier
6.29(ABYW.4) NWA55AXE 6.29(ABZL.3) and earlier 6.29(ABZL.4) NWA90AX 6.29(ACCV.3)
and earlier 6.29(ACCV.4) NWA110AX 6.65(ABTG.1) and earlier 6.70(ABTG.2) NWA210AX
6.65(ABTD.1) and earlier 6.70(ABTD.2) NWA220AX-6E 6.65(ACCO.1) and earlier
6.70(ACCO.1) NWA1123ACv3 6.65(ABVT.1) and earlier 6.70(ABVT.1) WAC500
6.65(ABVS.1) and earlier 6.70(ABVS.1) WAC500H 6.65(ABWA.1) and earlier
6.70(ABWA.1) WAX300H 6.60(ACHF.1) and earlier 6.70(ACHF.1) WAX510D 6.65(ABTF.1)
and earlier 6.70(ABTF.2) WAX610D 6.65(ABTE.1) and earlier 6.70(ABTE.2)
WAX620D-6E 6.65(ACCN.1) and earlier 6.70(ACCN.1) WAX630S 6.65(ABZD.1) and
earlier 6.70(ABZD.2) WAX640S-6E 6.65(ACCM.1) and earlier 6.70(ACCM.1) WAX650S
6.65(ABRM.1) and earlier 6.70(ABRM.2) WAX655E 6.65(ACDO.1) and earlier
6.70(ACDO.1) WBE660S 6.65(ACGG.1) and earlier 6.70(ACGG.2) NWA50AX-PRO
6.65(ACGE.1) and earlier Hotfix is available upon request*
Standard patch 6.80(ACGE.0) in July 2024 NWA90AX-PRO 6.65(ACGF.1) and earlier
Hotfix is available upon request*
Standard patch 6.80(ACGF.0) in July 2024

*Please reach out to your local Zyxel support team for the file.

GOT A QUESTION?

Please contact your local service rep or visit Zyxel’s Community for further
information or assistance.

ACKNOWLEDGMENT

Thanks to Lays and atdog from TRAPA Security for reporting the issues to us.

REVISION HISTORY

2024-2-20: Initial release
2024-2-21: Updated the affected model list and patch availability


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