Multiple vulnerabilities in Zyxel firewalls
| Risk | High |
| Patch available | YES |
| Number of vulnerabilities | 2 |
| CVE-ID | CVE-2023-33009 CVE-2023-33010 |
| CWE-ID | CWE-119 |
| Exploitation vector | Network |
| Public exploit |
Vulnerability #1 is being exploited in the wild. Vulnerability #2 is being exploited in the wild. |
| Vulnerable software Subscribe |
ATP series Hardware solutions / Routers for home users USG FLEX series Client/Desktop applications / Antivirus software/Personal firewalls VPN series Client/Desktop applications / Antivirus software/Personal firewalls USG series Client/Desktop applications / Antivirus software/Personal firewalls USG FLEX 50W Hardware solutions / Firmware USG20W-VPN Hardware solutions / Firmware ZyWALL Other software / Other software solutions |
| Vendor | ZyXEL Communications Corp. |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
1) Buffer overflow
EUVDB-ID: #VU76514
Risk: High
CVSSv3.1:
CVE-ID: CVE-2023-33009
CWE-ID:
Exploit availability:
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error in the notification function. A remote attacker can trigger memory corruption 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 - 5.36 Patch 1
USG FLEX series: 4.50 - 5.36 Patch 1
USG FLEX 50W: 4.25 - 5.36 Patch 1
USG20W-VPN: 4.25 - 5.36 Patch 1
VPN series: 4.30 - 5.36 Patch 1
ZyWALL: 4.25 - 4.73 Patch 1
USG series: 4.25 - 4.73 Patch 1
Fixed software versionsCPE2.3 External links
http://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-buffer-overflow-vulnerabilities-of-firewalls
http://www.zyxel.com/global/en/support/security-advisories/zyxels-guidance-for-the-recent-attacks-on-the-zywall-devices
Q & A
Can this vulnerability be exploited remotely?
How the attacker can exploit this vulnerability?
Is there known malware, which exploits this vulnerability?
2) Buffer overflow
EUVDB-ID: #VU76515
Risk: High
CVSSv3.1:
CVE-ID: CVE-2023-33010
CWE-ID:
Exploit availability:
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error in the ID processing function. A remote attacker can trigger memory corruption 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 - 5.36 Patch 1
USG FLEX series: 4.50 - 5.36 Patch 1
USG FLEX 50W: 4.25 - 5.36 Patch 1
USG20W-VPN: 4.25 - 5.36 Patch 1
VPN series: 4.30 - 5.36 Patch 1
ZyWALL: 4.25 - 4.73 Patch 1
USG series: 4.25 - 4.73 Patch 1
Fixed software versionsCPE2.3 External links
http://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-buffer-overflow-vulnerabilities-of-firewalls
http://www.zyxel.com/global/en/support/security-advisories/zyxels-guidance-for-the-recent-attacks-on-the-zywall-devices
Q & A
Can this vulnerability be exploited remotely?
How the attacker can exploit this vulnerability?
Is there known malware, which exploits this vulnerability?
