Multiple vulnerabilities in Zyxel firewalls and APs
Security Bulletin
This security bulletin contains information about 4 vulnerabilities.
1) NULL pointer dereference
EUVDB-ID: #VU86610
Risk: Low
CVSSv3.1: 5.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2023-6397
CWE-ID:
CWE-476 - NULL Pointer Dereference
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error. A remote attacker on the local network can use a specially crafted RAR compressed file and perform a denial of service (DoS) attack.
MitigationInstall updates from vendor's website.
Vulnerable software versionsATP series: 4.32 - 5.37 Patch 1
USG FLEX series: 4.50 - 5.37 Patch 1
External linksQ & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Format string error
EUVDB-ID: #VU86615
Risk: Low
CVSSv3.1: 5 [CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2023-6399
CWE-ID:
CWE-134 - Use of Externally-Controlled Format String
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a format string error. A remote user on the local network can supply a specially crafted input that contains format string specifiers and cause a denial of service condition on the target system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsATP series: 5.10 - 5.37 Patch 1
USG FLEX series: 5.10 - 5.37 Patch 1
USG FLEX 50W: 5.10 - 5.37 Patch 1
USG20W-VPN: 5.10 - 5.37 Patch 1
External linksQ & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
3) Format string error
EUVDB-ID: #VU86619
Risk: High
CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2023-6764
CWE-ID:
CWE-134 - Use of Externally-Controlled Format String
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a format string error in a function of the IPSec VPN feature. A remote attacker can supply a specially crafted input that contains format string specifiers and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsATP series: 4.32 - 5.37 Patch 1
USG FLEX series: 4.50 - 5.37 Patch 1
USG FLEX 50W: 4.16 - 5.37 Patch 1
USG20W-VPN: 4.16 - 5.37 Patch 1
External linksQ & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
4) OS Command Injection
EUVDB-ID: #VU86621
Risk: Low
CVSSv3.1: 6.3 [CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2023-6398
CWE-ID:
CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Exploit availability: No
DescriptionThe vulnerability allows a remote user to execute arbitrary shell commands on the target system.
The vulnerability exists due to improper input validation in the file upload binary. A remote administrator can pass specially crafted data to the application and execute arbitrary OS commands on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsATP series: 4.32 - 5.37 Patch 1
USG FLEX series: 4.50 - 5.37 Patch 1
USG FLEX 50W: 4.16 - 5.37 Patch 1
USG20W-VPN: 4.16 - 5.37 Patch 1
NWA50AX-PRO: 6.65(ACGE.1)
NWA90AX-PRO: 6.65(ACGF.1)
NWA50AX: 6.29(ABYW.3)
NWA55AXE: 6.29(ABZL.3)
NWA90AX: 6.29(ACCV.3)
NWA110AX: 6.65(ABTG.1)
NWA210AX: 6.65(ABTD.1)
NWA220AX-6E: 6.65(ACCO.1)
NWA1123ACv3: 6.65(ABVT.1)
WAC500: 6.65(ABVS.1)
WAC500H: 6.65(ABWA.1)
WAX300H: 6.60(ACHF.1)
WAX510D: 6.65(ABTF.1)
WAX610D: 6.65(ABTE.1)
WAX620D-6E: 6.65(ACCN.1)
WAX630S: 6.65(ABZD.1)
WAX640S-6E: 6.65(ACCM.1)
WAX650S: 6.65(ABRM.1)
WAX655E: 6.65(ACDO.1)
WBE660S: 6.65(ACGG.1)
External linksQ & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
