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 to cause denial-of-service (DoS) conditions and potentially execute arbitrary code by sending a specially crafted HTTP request.

Published: 2025-07-16 Last update: 2026-01-14 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-7673 is rated High Risk (68.2/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 1.42%). High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-7673

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-12 0.66% 1.42% +0.76%
2 2026-04-11 0.50% 0.66% +0.16%
3 2026-04-01 — 0.50% —

Full EPSS history (16 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-7673

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]

Weakness enumeration for CVE-2025-7673

Affected software / configurations for CVE-2025-7673

Vendor Product Version Raw CPE
zyxel emg3525-t50b_firmware < 5.50\(abpm.4\)c0 cpe:2.3:o:zyxel:emg3525-t50b_firmware:*:*:*:*:emea:*:*:*
zyxel emg3525-t50b_firmware < 5.50\(absl.0\)b8 cpe:2.3:o:zyxel:emg3525-t50b_firmware:*:*:*:*:america:*:*:*
zyxel emg5523-t50b_firmware < 5.50\(abpm.4\)c0 cpe:2.3:o:zyxel:emg5523-t50b_firmware:*:*:*:*:emea:*:*:*
zyxel emg5523-t50b_firmware < 5.50\(absl.0\)b8 cpe:2.3:o:zyxel:emg5523-t50b_firmware:*:*:*:*:america:*:*:*
zyxel emg5723-t50k_firmware < 5.50\(abom.5\)c0 cpe:2.3:o:zyxel:emg5723-t50k_firmware:*:*:*:*:*:*:*:*
zyxel emg6726-b10a_firmware < 5.13\(abnp.6\).c cpe:2.3:o:zyxel:emg6726-b10a_firmware:*:*:*:*:*:*:*:*
zyxel ex3510-b0_firmware < 5.17\(abup.3\)c0 cpe:2.3:o:zyxel:ex3510-b0_firmware:*:*:*:*:*:*:*:*
zyxel ex5510-b0_firmware < 5.15\(abqx.3\)c0 cpe:2.3:o:zyxel:ex5510-b0_firmware:*:*:*:*:*:*:*:*
zyxel vmg1312-t20b_firmware < 5.50\(absb.3\)c0 cpe:2.3:o:zyxel:vmg1312-t20b_firmware:*:*:*:*:*:*:*:*
zyxel vmg3625-t50b_firmware < 5.50\(abpm.4\)c0 cpe:2.3:o:zyxel:vmg3625-t50b_firmware:*:*:*:*:*:*:*:*
zyxel vmg3925-b10b_firmware < 5.13\(aavf.16\)c cpe:2.3:o:zyxel:vmg3925-b10b_firmware:*:*:*:*:*:*:*:*
zyxel vmg3925-b10c_firmware < 5.13\(aavf.16\)c cpe:2.3:o:zyxel:vmg3925-b10c_firmware:*:*:*:*:*:*:*:*
zyxel vmg3927-b50a_firmware < 5.15\(abmt.5\)c0 cpe:2.3:o:zyxel:vmg3927-b50a_firmware:*:*:*:*:*:*:*:*
zyxel vmg3927-b60a_firmware < 5.15\(abmt.5\)c0 cpe:2.3:o:zyxel:vmg3927-b60a_firmware:*:*:*:*:*:*:*:*
zyxel vmg3927-b50b_firmware < 5.13\(ably.6\)c0 cpe:2.3:o:zyxel:vmg3927-b50b_firmware:*:*:*:*:*:*:*:*
zyxel vmg3927-t50k_firmware < 5.50\(abom.5\)c0 cpe:2.3:o:zyxel:vmg3927-t50k_firmware:*:*:*:*:*:*:*:*
zyxel vmg4005-b50b_firmware < 5.13\(abrl.5\)c0 cpe:2.3:o:zyxel:vmg4005-b50b_firmware:*:*:*:*:*:*:*:*
zyxel vmg4927-b50a_firmware < 5.13\(ably.6\)c0 cpe:2.3:o:zyxel:vmg4927-b50a_firmware:*:*:*:*:*:*:*:*
zyxel vmg8623-t50b_firmware < 5.50\(abpm.4\)c0 cpe:2.3:o:zyxel:vmg8623-t50b_firmware:*:*:*:*:*:*:*:*
zyxel vmg8825-b50a_firmware < 5.15\(abmt.5\)c0 cpe:2.3:o:zyxel:vmg8825-b50a_firmware:*:*:*:*:*:*:*:*
zyxel vmg8825-b60a_firmware < 5.15\(abmt.5\)c0 cpe:2.3:o:zyxel:vmg8825-b60a_firmware:*:*:*:*:*:*:*:*
zyxel vmg8825-bx0b_firmware < 5.17\(abny.5\)c0 cpe:2.3:o:zyxel:vmg8825-bx0b_firmware:*:*:*:*:*:*:*:*
zyxel vmg8825-t50k_firmware < 5.50\(abom.5\)c0 cpe:2.3:o:zyxel:vmg8825-t50k_firmware:*:*:*:*:*:*:*:*
zyxel vmg8924-b10d_firmware < 5.13\(abgq.6\)c0 cpe:2.3:o:zyxel:vmg8924-b10d_firmware:*:*:*:*:*:*:*:*
zyxel xmg3927-b50a_firmware < 5.15\(abmt.5\)c0 cpe:2.3:o:zyxel:xmg3927-b50a_firmware:*:*:*:*:*:*:*:*
zyxel xmg8825-b50a_firmware < 5.17\(abmt.5\)c0 cpe:2.3:o:zyxel:xmg8825-b50a_firmware:*:*:*:*:*:*:*:*

References for CVE-2025-7673

cvelogic Threat Intelligence