VulnTideExploited vulnerabilities, by vendor. Data as of .
Not in CISA KEVReported exploited: VulnCheck KEV since Published CVSS 9.8 criticalEPSS 0.7% probability of exploitation in 30 days
Zyxel

CVE-2025-7673: A buffer overflow vulnerability in the URL parser of the zhttpd web server in Zyxel VMG8825-T50K firmware versions pr…

Is it exploited?

Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of .

VulnCheck KEV lists it since . It cites 1 public report, the first from .

How likely is exploitation in the next 30 days?
0.7%

EPSS score, percentile 51.2 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?
9.8 Critical

CVSS v3.1 base score, given by the CNA

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

Advisories and patches (1)

Which versions are affected?

Affected

  • < V5.50(ABOM.5)C0

Versions by product

Source: CISA KEV 2026.10.29, as of ; VulnCheck KEV, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.

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.

Source: CVE List, as of . About the data.

What to do

Advisories and patches

This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

Versions by product, as listed in the CVE record (1 product)
Zyxel VMG8825-T50K firmware
StatusVersions
Affected< V5.50(ABOM.5)C0

Versions not listed are: unaffected.

Source: CVE List, as of . About the data.

Weakness

CWE-120
  • CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.

Timeline

DateEvent
CVE record published
CVE record last updated

Known exploited Zyxel vulnerabilities

  • CVE-2026-7273: Zyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerability (added )
  • CVE-2024-40890: Zyxel DSL CPE OS Command Injection Vulnerability (added )
  • CVE-2024-40891: Zyxel DSL CPE OS Command Injection Vulnerability (added )
  • CVE-2024-11667: Zyxel Multiple Firewalls Path Traversal Vulnerability (added )
  • CVE-2017-6884: Zyxel EMG2926 Routers Command Injection Vulnerability (added )