Critical severity · published Jul 16, 2025
CVE-2025-7673
A buffer overflow vulnerability in the URL parser of the zhttpd web server in Zyxel VMG8825-T50K firmware versions prior to V5.50(ABOM.5)C0 could allow an unauthenticated attacker…
9.8
CVSS
0.7%
EPSS
No
On KEV
Description
A buffer overflow vulnerability in the URL parser of the zhttpd web server in Zyxel VMG8825-T50K firmware versions prior to V5.50(ABOM.5)C0 could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and potentially execute arbitrary code by sending a specially crafted HTTP request.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 51% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EF
Emg3525-t50b Firmware · Zyxel
before 5.50\(abpm.4\)c0; before 5.50\(absl.0\)b8 · source: NVD
EF
Emg5523-t50b Firmware · Zyxel
before 5.50\(abpm.4\)c0; before 5.50\(absl.0\)b8 · source: NVD
EF
Emg5723-t50k Firmware · Zyxel
before 5.50\(abom.5\)c0 · source: NVD
EF
Emg6726-b10a Firmware · Zyxel
before 5.13\(abnp.6\).c · source: NVD
EF
Ex3510-b0 Firmware · Zyxel
before 5.17\(abup.3\)c0 · source: NVD
EF
Ex5510-b0 Firmware · Zyxel
before 5.15\(abqx.3\)c0 · source: NVD
VF
Vmg1312-t20b Firmware · Zyxel
before 5.50\(absb.3\)c0 · source: NVD
VF
Vmg3625-t50b Firmware · Zyxel
before 5.50\(abpm.4\)c0 · source: NVD
VF
Vmg3925-b10b Firmware · Zyxel
before 5.13\(aavf.16\)c · source: NVD
VF
Vmg3925-b10c Firmware · Zyxel
before 5.13\(aavf.16\)c · source: NVD
VF
Vmg3927-b50a Firmware · Zyxel
before 5.15\(abmt.5\)c0 · source: NVD
VF
Vmg3927-b50b Firmware · Zyxel
before 5.13\(ably.6\)c0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-7673
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-7673
Vendor Advisory
https://www.zyxel.com/service-provider/global/en/zyxel-security-advisory-remote-code-execution-and-denial-service-vulnerabilities-cpe
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