Remote code execution in Zyxel products
| Risk | High |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2022-34747 |
| CWE-ID | CWE-134 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
NAS326 Hardware solutions / Routers for home users NAS540 Hardware solutions / Routers for home users NAS542 Hardware solutions / Routers for home users |
| Vendor | ZyXEL Communications Corp. |
Security Bulletin
This security bulletin contains one high risk vulnerability.
1) Format string error
EUVDB-ID: #VU67062
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-2022-34747
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. A remote attacker can use a specially crafted UDP packet 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 versionsNAS326: 5.21(AAZF.11)C0
NAS540: 5.21(AATB.8)C0
NAS542: 5.21(ABAG.8)C0
External linkshttp://www.zyxel.com/support/Zyxel-security-advisory-for-format-string-vulnerability-in-NAS.shtml
Q & 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.
