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CVE-2025-13943

8.8 · HIGH
Published Feb 24, 2026 zyxel CWE-78

Overview

CVE-2025-13943 is a high-severity vulnerability affecting zyxel ex5601-t1_firmware. It was published on February 24, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical Description

A post-authentication command injection vulnerability in the log file download function of the Zyxel EX3301-T0 firmware versions through 5.50(ABVY.7)C0 could allow an authenticated attacker to execute operating system (OS) commands on an affected device.

Remediation

Check the references section for vendor advisories and patches from zyxel. Update ex5601-t1_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

Vendor Product Versions Status
zyxel ex5601-t1_firmware >= 0, < 5.70\(acdz.5.1\)c0 Affected
zyxel ex7501-b0_firmware >= 0, < 5.18\(achn.3.1\)c0 Affected
zyxel ex7710-b0_firmware >= 0, < 5.18\(acak.1.6\)c0 Affected
zyxel gm4100-b0_firmware >= 0, < 5.18\(accl.2\)c0 Affected
zyxel pm7500-00_firmware >= 0, < 5.61\(ackk.1.2\)c0 Affected
zyxel vmg3625-t50b_firmware >= 0, < 5.50\(abpm.9.7\)c0 Affected
zyxel vmg4005-b50a_firmware >= 0, < 5.17\(abqa.3.2\)c0 Affected
zyxel vmg4005-b60a_firmware >= 0, < 5.17\(abqa.3.2\)c0 Affected
zyxel ax7501-b1_firmware >= 0, < 5.17\(abpc.7.1\)c0 Affected
zyxel pe3301-00_firmware >= 0, < 5.63\(acmt.2.1\)c0 Affected

References

Ref www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-null-pointer-dereference-and-command-injection-vulnerabilities-in-certain-4g-lte-5g-nr-cpe-dsl-ethernet-cpe-fiber-onts-security-routers-and-wireless-extenders-02-24-2026

Frequently Asked Questions

What is CVE-2025-13943?

CVE-2025-13943 is a high-severity vulnerability affecting zyxel ex5601-t1_firmware. It was published on February 24, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2025-13943?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-13943?

Check the references section for vendor advisories and patches from zyxel. Update ex5601-t1_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-13943?

CyberStrike's AI-powered security agents can automatically detect CVE-2025-13943 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.

How CyberStrike Helps

Autonomous Discovery

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Continuous Pentesting

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Code Review

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HackBrowser

Browser-based exploitation validates findings with real proof-of-concept.
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