CVE-1999-0240
CVE-1999-0240 is a high-severity vulnerability with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.
Key facts
- Severity: High (CVSS 2.0 base score 7.5)
- EPSS exploit prediction: 1% (67th percentile)
- Actively exploited: Not listed in CISA KEV
- Published:
- Last modified:
Description
Some filters or firewalls allow fragmented SYN packets with IP reserved bits in violation of their implemented policy.
Frequently asked questions
- What is CVE-1999-0240?
- Some filters or firewalls allow fragmented SYN packets with IP reserved bits in violation of their implemented policy.
- How severe is CVE-1999-0240?
- CVE-1999-0240 has a CVSS 2.0 base score of 7.5, rated high severity.
- Is CVE-1999-0240 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-1999-0240?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-1999-0240 published?
- CVE-1999-0240 was published on 1999-01-01 and last updated on 2026-06-16.