Buffer overflow in ZyXEL Communications Corp. products - CVE-2025-7673
Published: July 18, 2025
Vulnerability identifier: #VU113043
CSH Severity: High
CVSS v4: 9.3 [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]
CVE-ID: CVE-2025-7673
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error in the URL parser of the zhttpd web server. 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.
Affected software
VMG4005-B50B
VMG8924-B10D
VMG4927-B50A
VMG3927-B50B
EMG6726-B10A
VMG3925-B10B/B10C
EX5510-B0
VMG3927-B50A_B60A
XMG8825-B50A
XMG3927-B50A
VMG8825-B50A_B60A
EX3510-B0
VMG8825-Bx0B
EMG5523-T50B
EMG3525-T50B
VMG1312-T20B
VMG3625-T50B
VMG8623-T50B
VMG3927-T50K
EMG5723-T50K
VMG8825-T50K
VMG8924-B10D
VMG4927-B50A
VMG3927-B50B
EMG6726-B10A
VMG3925-B10B/B10C
EX5510-B0
VMG3927-B50A_B60A
XMG8825-B50A
XMG3927-B50A
VMG8825-B50A_B60A
EX3510-B0
VMG8825-Bx0B
EMG5523-T50B
EMG3525-T50B
VMG1312-T20B
VMG3625-T50B
VMG8623-T50B
VMG3927-T50K
EMG5723-T50K
VMG8825-T50K
How to mitigate CVE-2025-7673
Install updates from vendor's website.
VMG4005-B50B - update to V5.13(ABRL.5)C0
VMG8924-B10D - update to V5.13(ABGQ.6)C0
VMG4927-B50A - update to V5.13(ABLY.6)C0
VMG3927-B50B - update to 5.13(ABLY.6)C0
EMG6726-B10A - update to V5.13 (ABNP.6).C0
VMG3925-B10B/B10C - update to V5.13(AAVF.16)C0
EX5510-B0 - update to V5.15(ABQX.3)C0
VMG3927-B50A_B60A - update to V5.15(ABMT.5)C0
XMG8825-B50A - update to V5.15(ABMT.5)C0
XMG3927-B50A - update to V5.15(ABMT.5)C0
VMG8825-B50A_B60A - update to V5.15(ABMT.5)C0
EX3510-B0 - update to V5.17(ABUP.3)C0
VMG8825-Bx0B - update to 5.17(ABNY.5)C0
EMG5523-T50B - addressed in versions V5.50(ABSL.0)b8, V5.50(ABPM.4)C0
EMG3525-T50B - addressed in versions V5.50(ABSL.0)b8, V5.50(ABPM.4)C0
VMG1312-T20B - update to V5.50(ABSB.3)C0
VMG3625-T50B - update to V5.50(ABPM.4)C0
VMG8623-T50B - update to V5.50(ABPM.4)C0
VMG3927-T50K - update to V5.50(ABOM.5)C0
EMG5723-T50K - update to V5.50(ABOM.5)C0
VMG8825-T50K - update to V5.50(ABOM.5)C0
VMG8924-B10D - update to V5.13(ABGQ.6)C0
VMG4927-B50A - update to V5.13(ABLY.6)C0
VMG3927-B50B - update to 5.13(ABLY.6)C0
EMG6726-B10A - update to V5.13 (ABNP.6).C0
VMG3925-B10B/B10C - update to V5.13(AAVF.16)C0
EX5510-B0 - update to V5.15(ABQX.3)C0
VMG3927-B50A_B60A - update to V5.15(ABMT.5)C0
XMG8825-B50A - update to V5.15(ABMT.5)C0
XMG3927-B50A - update to V5.15(ABMT.5)C0
VMG8825-B50A_B60A - update to V5.15(ABMT.5)C0
EX3510-B0 - update to V5.17(ABUP.3)C0
VMG8825-Bx0B - update to 5.17(ABNY.5)C0
EMG5523-T50B - addressed in versions V5.50(ABSL.0)b8, V5.50(ABPM.4)C0
EMG3525-T50B - addressed in versions V5.50(ABSL.0)b8, V5.50(ABPM.4)C0
VMG1312-T20B - update to V5.50(ABSB.3)C0
VMG3625-T50B - update to V5.50(ABPM.4)C0
VMG8623-T50B - update to V5.50(ABPM.4)C0
VMG3927-T50K - update to V5.50(ABOM.5)C0
EMG5723-T50K - update to V5.50(ABOM.5)C0
VMG8825-T50K - update to V5.50(ABOM.5)C0