Remote code execution in Zyxel routers
| Risk | High |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | N/A |
| CWE-ID | CWE-20 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software |
EMG3525-T50B Hardware solutions / Routers for home users EMG5523-T50B Hardware solutions / Routers for home users EMG5723-T50K Hardware solutions / Routers for home users EMG6726-B10A Hardware solutions / Routers for home users EX3510-B0 Hardware solutions / Routers for home users EX5510-B0 Hardware solutions / Routers for home users VMG3625-T50B Hardware solutions / Routers for home users VMG3925-B10B/B10C Hardware solutions / Routers for home users VMG3927-B50A_B60A Hardware solutions / Routers for home users VMG3927-B50B Hardware solutions / Routers for home users VMG3927-T50K Hardware solutions / Routers for home users VMG4005-B50B Hardware solutions / Routers for home users VMG4927-B50A Hardware solutions / Routers for home users VMG8623-T50B Hardware solutions / Routers for home users VMG8825-B50A_B60A Hardware solutions / Routers for home users VMG8825-Bx0B Hardware solutions / Routers for home users VMG8825-T50K Hardware solutions / Routers for home users VMG8924-B10D Hardware solutions / Routers for home users XMG3927-B50A Hardware solutions / Routers for home users XMG8825-B50A Hardware solutions / Routers for home users VMG1312-T20B Hardware solutions / Routers for home users |
| Vendor | ZyXEL Communications Corp. |
Security Bulletin
This security bulletin contains one high risk vulnerability.
1) Input validation error
EUVDB-ID: #VU49097
Risk: High
CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]
CVE-ID: N/A
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to insufficient validation of user-supplied input when processing HTTP requests in zhttpd webserver. A remote attacker can send specially crafted HTTP request to the affected device and execute arbitrary code on the system.
Successful exploitation of the vulnerability will result in a complete compromise of the router.
Install updates from vendor's website.
Note, some of the firmware updates are scheduled to be released during 2021.
EMG3525-T50B: before V5.50(ABSL.0)b8
EMG5523-T50B: before V5.50(ABSL.0)b8
EMG5723-T50K: before V5.50(ABOM.5)C0
EMG6726-B10A: before V5.13 (ABNP.6).C0
EX3510-B0: before V5.17(ABUP.3)C0
EX5510-B0: before V5.15(ABQX.3)C0
VMG3625-T50B: before V5.50(ABPM.4)C0
VMG3925-B10B/B10C: before V5.13(AAVF.16)C0
VMG3927-B50A_B60A: before V5.15(ABMT.5)C0
VMG3927-B50B: before V5.13(ABLY.6)C0
VMG3927-T50K: before V5.50(ABOM.5)C0
VMG4005-B50B: before V5.13(ABRL.5)C0
VMG4927-B50A: before V5.13(ABLY.6)C0
VMG8623-T50B: before V5.50(ABPM.4)C0
VMG8825-B50A_B60A: before V5.15(ABMT.5)C0
VMG8825-Bx0B: before V5.15(ABNY.5)C0
VMG8825-T50K: before V5.50(ABOM.5)C0
VMG8924-B10D: before V5.13(ABGQ.6)C0
XMG3927-B50A: before V5.15(ABMT.5)C0
XMG8825-B50A: before V5.15(ABMT.5)C0
VMG1312-T20B: before V5.50(ABSB.3)C0
CPE2.3- cpe:2.3:h:zyxel_communications_corp:emg3525-t50b:*:*:*:*:*:*:*:*
- cpe:2.3:h:zyxel_communications_corp:emg5523-t50b:*:*:*:*:*:*:*:*
- cpe:2.3:h:zyxel_communications_corp:emg5723-t50k:*:*:*:*:*:*:*:*
- cpe:2.3:h:zyxel_communications_corp:emg6726-b10a:*:*:*:*:*:*:*:*
- cpe:2.3:h:zyxel_communications_corp:ex3510-b0:*:*:*:*:*:*:*:*
- cpe:2.3:h:zyxel_communications_corp:ex5510-b0:*:*:*:*:*:*:*:*
- cpe:2.3:h:zyxel_communications_corp:vmg3625-t50b:*:*:*:*:*:*:*:*
- cpe:2.3:h:zyxel_communications_corp:vmg3925-b10b_b10c:*:*:*:*:*:*:*:*
- cpe:2.3:h:zyxel_communications_corp:vmg3927-b50a_b60a:*:*:*:*:*:*:*:*
- cpe:2.3:h:zyxel_communications_corp:vmg3927-b50b:*:*:*:*:*:*:*:*
- cpe:2.3:h:zyxel_communications_corp:vmg3927-t50k:*:*:*:*:*:*:*:*
- cpe:2.3:h:zyxel_communications_corp:vmg4005-b50b:*:*:*:*:*:*:*:*
- cpe:2.3:h:zyxel_communications_corp:vmg4927-b50a:*:*:*:*:*:*:*:*
- cpe:2.3:h:zyxel_communications_corp:vmg8623-t50b:*:*:*:*:*:*:*:*
- cpe:2.3:h:zyxel_communications_corp:vmg8825-b50a_b60a:*:*:*:*:*:*:*:*
- cpe:2.3:h:zyxel_communications_corp:vmg8825-bx0b:*:*:*:*:*:*:*:*
- cpe:2.3:h:zyxel_communications_corp:vmg8825-t50k:*:*:*:*:*:*:*:*
- cpe:2.3:h:zyxel_communications_corp:vmg8924-b10d:*:*:*:*:*:*:*:*
- cpe:2.3:h:zyxel_communications_corp:xmg3927-b50a:*:*:*:*:*:*:*:*
- cpe:2.3:h:zyxel_communications_corp:xmg8825-b50a:*:*:*:*:*:*:*:*
- cpe:2.3:h:zyxel_communications_corp:vmg1312-t20b:*:*:*:*:*:*:*:*
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.
