Authenticated Command Injection in Zyxel EX3301-T0 Log File Download CGI
CVE-2025-13943 is a post-authentication command injection vulnerability affecting Zyxel EX3301-T0 firmware through version 5.50(ABVY.7)C0. The flaw is in the device's log file download function / log export CGI, where insufficient neutralization of attacker-controlled input allows an authenticated user to inject and execute operating system commands on the underlying device. The issue is network-reachable after authentication and has been described by Zyxel as enabling OS command execution on affected devices.
Are you exposed to this one?
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
23 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An authenticated command injection vulnerability in Zyxel log export CGI that can lead to remote code execution.
An authenticated command injection vulnerability in Zyxel log export CGI that can lead to remote code execution.
Unknown (listed as a trending CVE affecting Zyxel products).
Unknown (listed as a trending CVE affecting Zyxel; no technical details provided in the content).
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.