CVE-2025-13943
Post-auth command injection in Zyxel EX3301-T0 log download allows OS command execution.
Is CVE-2025-13943 being exploited?
Not confirmed. CVE-2025-13943 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 1.4% probability of exploitation in the next 30 days.
How severe is CVE-2025-13943?
CVE-2025-13943 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2025-13943?
Yes. A fix has been recorded for CVE-2025-13943. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2025-13943 affect?
CVE-2025-13943 affects Zyxel EX3301-T0 firmware up to 5.50(ABVY.7)C0. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2025-13943?
Patch when available; restrict admin access and isolate affected devices
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated attacker can execute OS commands on the device via log download function.
Immediate action required
- affected<= 5.50
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.