PatchTheCVECVE-2003-1250: Efficient Networks 5861 DSL router, when running firmware 5.3.80 configured to block incoming TCP SYN, packets
CVE-2003-1250 is a medium-severity flaw (CVSS 5.0) affecting 5861 dsl router. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Efficient Networks 5861 DSL router, when running firmware 5.3.80 configured to block incoming TCP SYN, packets allows remote attackers to cause a denial of service (crash) via a flood of TCP SYN packets to the WAN interface using a port scanner such as nmap.
Why this priority
- No elevated risk signals yet
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 5.0 (Medium) |
| EPSS exploit chance | 1.8% (top 21%) |
| CISA exploited list | No |
| Published | 2003-12-31 |
| Last modified | 2026-06-16 |
Last updated 2026-06-16 · 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-2003-1250?
5861 dsl router: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2003-1250 being exploited?
CVE-2003-1250 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-2003-1250 affect?
CVE-2003-1250 affects 5861 dsl router. Severity is medium (CVSS 5.0). Efficient Networks 5861 DSL router, when running firmware 5.3.80 configured to block incoming TCP SYN, packets allows remote attackers to cause a denial of service (crash) via a flood of TCP SYN packets to the WAN interface using a port sca
How urgent is CVE-2003-1250?
Priority 37/100. No elevated risk signals yet.