CVE-2025-24356

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 38% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.5Exploit: NoneExposed: 0

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

fastd is a VPN daemon which tunnels IP packets and Ethernet frames over UDP. When receiving a data packet from an unknown IP address/port combination, fastd will assume that one of its connected peers has moved to a new address and initiate a reconnect by sending a handshake packet. This "fast reconnect" avoids having to wait for a session timeout (up to ~90s) until a new connection is established. Even a 1-byte UDP packet just containing the fastd packet type header can trigger a much larger handshake packet (~150 bytes of UDP payload). Including IPv4 and UDP headers, the resulting amplification factor is roughly 12-13. By sending data packets with a spoofed source address to fastd instances reachable on the internet, this amplification of UDP traffic might be used to facilitate a Distributed Denial of Service attack. This vulnerability is fixed in v23.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
47.3%
KEV
Not listed

Published

January 27, 2025

Last Modified

August 27, 2025

References (8)

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 45× 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. 2026-07-22 14:07 UTCEPSS rescore
  2. 2026-07-22 14:07 UTCEPSS rescore
  3. 2026-07-21 15:24 UTCEPSS rescore
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  20. 2026-07-11 08:27 UTCEPSS rescore
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  22. 2026-07-09 19:09 UTCEPSS rescore
  23. 2026-07-08 15:14 UTCEPSS rescore
  24. 2026-07-07 12:21 UTCOSV refresh
  25. 2026-07-06 16:26 UTCEPSS rescore
Show 64 more
  1. 2026-07-06 02:22 UTCEPSS rescore
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  3. 2026-07-05 02:30 UTCEPSS rescore
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  5. 2026-07-01 15:06 UTCEPSS rescore
  6. 2026-06-30 23:21 UTCEPSS rescore
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  8. 2026-06-29 14:06 UTCEPSS rescore
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  11. 2026-06-28 04:55 UTCEPSS rescore
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  13. 2026-06-27 03:08 UTCEPSS rescore
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  15. 2026-06-25 13:49 UTCEPSS rescore
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  17. 2026-06-24 14:04 UTCEPSS rescore
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  19. 2026-06-23 21:32 UTCEPSS rescore
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  21. 2026-06-22 14:25 UTCEPSS rescore
  22. 2026-06-22 14:25 UTCEPSS rescore
  23. 2026-06-21 14:56 UTCEPSS rescore
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  25. 2026-06-21 01:59 UTCEPSS rescore
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  27. 2026-06-19 19:25 UTCEPSS rescore
  28. 2026-06-19 19:25 UTCEPSS rescore
  29. 2026-06-18 23:35 UTCOSV refresh
  30. 2026-06-18 17:52 UTCEPSS rescore
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  32. 2026-06-17 17:52 UTCEPSS rescore
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  35. 2026-06-15 17:48 UTCEPSS rescore
  36. 2026-06-14 23:17 UTCEPSS rescore
  37. 2026-06-13 22:59 UTCEPSS rescore
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  39. 2026-06-11 13:59 UTCEPSS rescore
  40. 2026-06-10 22:18 UTCEPSS rescore
  41. 2026-06-10 13:22 UTCEPSS rescore
  42. 2026-06-08 14:16 UTCEPSS rescore
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  44. 2026-06-07 15:24 UTCEPSS rescore
  45. 2026-06-07 15:24 UTCEPSS rescore
  46. 2026-06-06 13:47 UTCEPSS rescore
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  48. 2026-06-05 22:46 UTCEPSS rescore
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  50. 2026-06-05 06:10 UTCEPSS rescore
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  52. 2026-06-04 13:11 UTCEPSS rescore
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  54. 2026-06-02 20:12 UTCEPSS rescore
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  56. 2026-06-01 13:51 UTCEPSS rescore
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  58. 2026-05-31 22:30 UTCEPSS rescore
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  60. 2026-05-31 00:16 UTCEPSS rescore
  61. 2026-05-31 00:16 UTCEPSS rescore
  62. 2026-05-30 12:39 UTCEG score recompute
  63. 2026-05-30 07:23 UTCOSV refresh
  64. 2026-05-29 13:44 UTCEPSS rescore

Frequently asked(5)

What is CVE-2025-24356?
CVE-2025-24356 is a high vulnerability published on January 27, 2025. fastd is a VPN daemon which tunnels IP packets and Ethernet frames over UDP. When receiving a data packet from an unknown IP address/port combination, fastd will assume that one of its connected peers has moved to a new address and initiate a reconnect by sending a handshake packet. This "fast…
When was CVE-2025-24356 disclosed?
CVE-2025-24356 was first published in the National Vulnerability Database on January 27, 2025, with the most recent update on August 27, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-24356 actively exploited?
CVE-2025-24356 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 47.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-24356?
CVE-2025-24356 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2025-24356?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-24356, 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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