CVE-2020-25014

Name: CVE-2020-25014
Creator: NVD / NIST
Published: 2020-11-27T18:15:11.563+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 4.26%

Last modified Jun 17, 2026

CVE-2020-25014 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A stack-based buffer overflow in fbwifi_continue.cgi on Zyxel UTM and VPN series of gateways running firmware version V4.30 through to V4.55 allows remote unauthenticated attackers to execute arbitrary code via a crafted http packet.. EPSS estimates a 4.26% chance of exploitation in the next 30 days.

Description

A stack-based buffer overflow in fbwifi_continue.cgi on Zyxel UTM and VPN series of gateways running firmware version V4.30 through to V4.55 allows remote unauthenticated attackers to execute arbitrary code via a crafted http packet.

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

4.26%

89.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Zyxel	Zld	>= 4.30, <= 4.55
Zyxel	Access Points Firmware	<= 6.10
Zyxel	Access Points Firmware	6.10
Zyxel	Access Points Firmware	All versions

References

https://businessforum.zyxel.com/categories/security-news-and-releaseRelease Notes, Vendor Advisory
https://www.zyxel.com/support/Zyxel-security-advisory-for-buffer-overflow-vulnerability.shtmlVendor Advisory
https://businessforum.zyxel.com/categories/security-news-and-releaseRelease Notes, Vendor Advisory
https://www.zyxel.com/support/Zyxel-security-advisory-for-buffer-overflow-vulnerability.shtmlVendor Advisory

Timeline

Published: Nov 27, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-25014?

How severe is CVE-2020-25014?

CVE-2020-25014 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 4.26% probability of exploitation in the next 30 days.

How do I fix CVE-2020-25014?

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-2020-25014?

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

Scan your code now

Source: NVD / NIST