CVE-2002-0518

NONECVSS 0.0
0.0
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No confirmed exploitation signals yet
CISA-KEV: Not listedEPSS: 2%CVSS: —Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

The SYN cache (syncache) and SYN cookie (syncookie) mechanism in FreeBSD 4.5 and earlier allows remote attackers to cause a denial of service (crash) (1) via a SYN packet that is accepted using syncookies that causes a null pointer to be referenced for the socket's TCP options, or (2) by killing and restarting a process that listens on the same socket, which does not properly clear the old inpcb pointer on restart.

CVSS v3
—
EG Score
0.0(none)
EPSS
82.6%
KEV
Not listed

Published

August 12, 2002

Last Modified

June 16, 2026

References (10)

Data Freshness Timeline

(refreshed 3× in last 7d / 18× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-13 06:07 UTCEPSS rescore
  2. 2026-07-11 08:22 UTCEPSS rescore
  3. 2026-07-08 15:08 UTCEPSS rescore
  4. 2026-07-04 06:26 UTCEPSS rescore
  5. 2026-07-02 14:00 UTCEPSS rescore
  6. 2026-06-29 14:02 UTCEPSS rescore
  7. 2026-06-28 14:02 UTCEPSS rescore
  8. 2026-06-27 03:04 UTCEPSS rescore
  9. 2026-06-24 14:01 UTCEPSS rescore
  10. 2026-06-23 21:29 UTCEPSS rescore
  11. 2026-06-22 14:22 UTCEPSS rescore
  12. 2026-06-21 01:56 UTCEPSS rescore
  13. 2026-06-19 19:22 UTCEPSS rescore
  14. 2026-06-18 17:49 UTCEPSS rescore
  15. 2026-06-18 17:49 UTCEPSS rescore
  16. 2026-06-17 17:49 UTCEPSS rescore
  17. 2026-06-16 17:49 UTCEPSS rescore
  18. 2026-06-14 23:13 UTCEPSS rescore
  19. 2026-06-13 22:56 UTCEPSS rescore
  20. 2026-06-12 23:07 UTCEPSS rescore
  21. 2026-06-11 13:55 UTCEPSS rescore
  22. 2026-06-10 22:13 UTCEPSS rescore
  23. 2026-06-10 13:17 UTCEPSS rescore
  24. 2026-06-08 14:13 UTCEPSS rescore
  25. 2026-06-07 15:21 UTCEPSS rescore
Show 30 more
  1. 2026-06-06 13:44 UTCEPSS rescore
  2. 2026-06-05 06:07 UTCEPSS rescore
  3. 2026-06-04 13:09 UTCEPSS rescore
  4. 2026-06-02 20:10 UTCEPSS rescore
  5. 2026-06-01 13:48 UTCEPSS rescore
  6. 2026-05-31 22:27 UTCEPSS rescore
  7. 2026-05-31 19:14 UTCEG score recompute
  8. 2026-05-31 19:14 UTCGHSA enrichment
  9. 2026-05-31 00:13 UTCEPSS rescore
  10. 2026-05-31 00:13 UTCEPSS rescore
  11. 2026-05-29 13:40 UTCEPSS rescore
  12. 2026-05-28 13:42 UTCEPSS rescore
  13. 2026-05-28 13:42 UTCEPSS rescore
  14. 2026-05-28 13:42 UTCEPSS rescore
  15. 2026-05-28 13:42 UTCEPSS rescore
  16. 2026-05-27 13:37 UTCEPSS rescore
  17. 2026-05-27 13:37 UTCEPSS rescore
  18. 2026-05-26 13:41 UTCEPSS rescore
  19. 2026-05-26 13:41 UTCEPSS rescore
  20. 2026-05-26 13:41 UTCEPSS rescore
  21. 2026-05-26 07:16 UTCEPSS rescore
  22. 2026-05-26 07:16 UTCEPSS rescore
  23. 2026-05-24 16:42 UTCEPSS rescore
  24. 2026-05-22 21:15 UTCEPSS rescore
  25. 2026-05-21 22:38 UTCEPSS rescore
  26. 2026-05-20 22:36 UTCEPSS rescore
  27. 2026-05-20 11:20 UTCEPSS rescore
  28. 2026-05-20 11:20 UTCEPSS rescore
  29. 2026-05-18 21:29 UTCEPSS rescore
  30. 2026-05-18 21:29 UTCEPSS rescore

Frequently asked(4)

What is CVE-2002-0518?
CVE-2002-0518 is a none vulnerability published on August 12, 2002. The SYN cache (syncache) and SYN cookie (syncookie) mechanism in FreeBSD 4.5 and earlier allows remote attackers to cause a denial of service (crash) (1) via a SYN packet that is accepted using syncookies that causes a null pointer to be referenced for the socket's TCP options, or (2) by killing…
When was CVE-2002-0518 disclosed?
CVE-2002-0518 was first published in the National Vulnerability Database on August 12, 2002, with the most recent update on June 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2002-0518 actively exploited?
CVE-2002-0518 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 82.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-2002-0518?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2002-0518, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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