PatchTheCVECVE-2025-6599: An uncontrolled resource consumption vulnerability in the web server of Zyxel DX3301-T0 firmware version 5.50(
CVE-2025-6599 is a medium-severity flaw (CVSS 5.3) affecting lte3301-plus firmware, nr5103 firmware, nr5103e firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
An uncontrolled resource consumption vulnerability in the web server of Zyxel DX3301-T0 firmware version 5.50(ABVY.6.3)C0 and earlier could allow an attacker to perform Slowloris‑style denial‑of‑service (DoS) attacks. Such attacks may temporarily block legitimate HTTP requests and partially disrupt access to the web management interface, while other networking services remain unaffected.
Why this priority
- Remotely exploitable, no login, no user action
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 5.3 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.3% (top 73%) |
| CISA exploited list | No |
| Weakness | CWE-400 |
| Published | 2025-11-18 |
| Last modified | 2026-10-18 |
Last updated 2026-10-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2025-6599?
lte3301-plus firmware: mitigate or apply the listed mitigation; nr5103 firmware: mitigate or apply the listed mitigation; nr5103e firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2025-6599 being exploited?
CVE-2025-6599 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2025-6599 affect?
CVE-2025-6599 affects lte3301-plus firmware, nr5103 firmware, nr5103e firmware. Severity is medium (CVSS 5.3). An uncontrolled resource consumption vulnerability in the web server of Zyxel DX3301-T0 firmware version 5.50(ABVY.6.3)C0 and earlier could allow an attacker to perform Slowloris‑style denial‑of‑service (DoS) attacks. Such attacks may tempo
How urgent is CVE-2025-6599?
Priority 30/100. Remotely exploitable, no login, no user action
Software pages
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