PatchTheCVECVE-2003-0450: Cistron RADIUS daemon (radiusd-cistron) 1.6.6 and earlier allows remote attackers to cause a denial of service
CVE-2003-0450 is a high-severity flaw (CVSS 7.5) affecting radius daemon. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Cistron RADIUS daemon (radiusd-cistron) 1.6.6 and earlier allows remote attackers to cause a denial of service and possibly execute arbitrary code via a large value in an NAS-Port attribute, which is interpreted as a negative number and causes a buffer overflow.
Why this priority
- High severity
- EPSS top 9%: very likely to be exploited
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.5 (High) |
| EPSS exploit chance | 4.2% (top 9%) |
| CISA exploited list | No |
| Published | 2003-08-07 |
| 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-2003-0450?
radius daemon: upgrade to newer than 1.6.6. Exact commands for each OS are on this page.
Is CVE-2003-0450 being exploited?
CVE-2003-0450 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-2003-0450 affect?
CVE-2003-0450 affects radius daemon. Severity is high (CVSS 7.5). Cistron RADIUS daemon (radiusd-cistron) 1.6.6 and earlier allows remote attackers to cause a denial of service and possibly execute arbitrary code via a large value in an NAS-Port attribute, which is interpreted as a negative number and cau
How urgent is CVE-2003-0450?
Priority 54/100. High severity; EPSS top 9%: very likely to be exploited; Public exploit reference