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CVE-2025-7673

CRITICALCVSS 9.8/10EPSS 0.55%

Last modified

CVE-2025-7673 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 0.55% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.55%

41.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
ZyxelEmg3525-T50b Firmware< 5.50\(abpm.4\)c0
ZyxelEmg3525-T50b Firmware< 5.50\(absl.0\)b8
ZyxelEmg5523-T50b Firmware< 5.50\(abpm.4\)c0
ZyxelEmg5523-T50b Firmware< 5.50\(absl.0\)b8
ZyxelEmg5723-T50k Firmware< 5.50\(abom.5\)c0
ZyxelEmg6726-B10a Firmware< 5.13\(abnp.6\).c
ZyxelEx3510-B0 Firmware< 5.17\(abup.3\)c0
ZyxelEx5510-B0 Firmware< 5.15\(abqx.3\)c0
ZyxelVmg1312-T20b Firmware< 5.50\(absb.3\)c0
ZyxelVmg3625-T50b Firmware< 5.50\(abpm.4\)c0
ZyxelVmg3925-B10b Firmware< 5.13\(aavf.16\)c
ZyxelVmg3925-B10c Firmware< 5.13\(aavf.16\)c
ZyxelVmg3927-B50a Firmware< 5.15\(abmt.5\)c0
ZyxelVmg3927-B60a Firmware< 5.15\(abmt.5\)c0
ZyxelVmg3927-B50b Firmware< 5.13\(ably.6\)c0
ZyxelVmg3927-T50k Firmware< 5.50\(abom.5\)c0
ZyxelVmg4005-B50b Firmware< 5.13\(abrl.5\)c0
ZyxelVmg4927-B50a Firmware< 5.13\(ably.6\)c0
ZyxelVmg8623-T50b Firmware< 5.50\(abpm.4\)c0
ZyxelVmg8825-B50a Firmware< 5.15\(abmt.5\)c0
ZyxelVmg8825-B60a Firmware< 5.15\(abmt.5\)c0
ZyxelVmg8825-Bx0b Firmware< 5.17\(abny.5\)c0
ZyxelVmg8825-T50k Firmware< 5.50\(abom.5\)c0
ZyxelVmg8924-B10d Firmware< 5.13\(abgq.6\)c0
ZyxelXmg3927-B50a Firmware< 5.15\(abmt.5\)c0
ZyxelXmg8825-B50a Firmware< 5.17\(abmt.5\)c0

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is 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.
How severe is CVE-2025-7673?
CVE-2025-7673 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.55% probability of exploitation in the next 30 days.
How do I fix CVE-2025-7673?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-7673?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST