CVE-2025-20271

HIGHNVD 8.68.6—
EchelonGraph scoreMEDIUM confidence

Score 8.6 from GitHub Security Advisory (severity: HIGH) published 2025-06-18. NVD baseline CVSS 8.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.6
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.6Exploit: NoneExposed: 0

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

A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gateway devices could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition in the Cisco AnyConnect service on an affected device. This vulnerability is due to variable initialization errors when an SSL VPN session is established. An attacker could exploit this vulnerability by sending a sequence of crafted HTTPS requests to an affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to restart, resulting in the failure of all established SSL VPN sessions and forcing remote users to initiate a new VPN connection and re-authenticate. A sustained attack could prevent new SSL VPN connections from being established, effectively making the Cisco AnyConnect VPN service unavailable for all legitimate users.

CVSS v3
8.6
EG Score
8.6(medium)
EPSS
38.6%
KEV
Not listed

Published

June 18, 2025

Last Modified

April 15, 2026

References (1)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 41× 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.

Showing the most recent 100 of 116 total refreshes for this CVE.

  1. 2026-07-22 14:07 UTCEPSS rescore
  2. 2026-07-22 14:07 UTCEPSS rescore
  3. 2026-07-21 15:24 UTCEPSS rescore
  4. 2026-07-19 14:30 UTCEPSS rescore
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  6. 2026-07-19 02:28 UTCEPSS rescore
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  8. 2026-07-18 10:03 UTCEPSS rescore
  9. 2026-07-16 17:02 UTCEPSS rescore
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  11. 2026-07-15 16:57 UTCEPSS rescore
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  13. 2026-07-15 01:59 UTCEPSS rescore
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  15. 2026-07-13 22:29 UTCEPSS rescore
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  17. 2026-07-13 06:12 UTCEPSS rescore
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  24. 2026-07-07 13:45 UTCEPSS rescore
  25. 2026-07-06 02:22 UTCEPSS rescore
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  1. 2026-07-06 02:22 UTCEPSS rescore
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  4. 2026-07-01 15:06 UTCEPSS rescore
  5. 2026-06-30 23:21 UTCEPSS rescore
  6. 2026-06-29 14:06 UTCEPSS rescore
  7. 2026-06-28 14:07 UTCEPSS rescore
  8. 2026-06-28 14:07 UTCEPSS rescore
  9. 2026-06-28 04:55 UTCEPSS rescore
  10. 2026-06-27 03:08 UTCEPSS rescore
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  12. 2026-06-25 13:49 UTCEPSS rescore
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  19. 2026-06-21 14:56 UTCEPSS rescore
  20. 2026-06-21 14:56 UTCEPSS rescore
  21. 2026-06-21 01:59 UTCEPSS rescore
  22. 2026-06-21 01:59 UTCEPSS rescore
  23. 2026-06-19 19:25 UTCEPSS rescore
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  25. 2026-06-18 17:52 UTCEPSS rescore
  26. 2026-06-18 17:52 UTCEPSS rescore
  27. 2026-06-17 17:52 UTCEPSS rescore
  28. 2026-06-16 17:52 UTCEPSS rescore
  29. 2026-06-15 17:48 UTCEPSS rescore
  30. 2026-06-14 23:17 UTCEPSS rescore
  31. 2026-06-13 22:59 UTCEPSS rescore
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  33. 2026-06-12 23:11 UTCEPSS rescore
  34. 2026-06-11 13:59 UTCEPSS rescore
  35. 2026-06-10 22:18 UTCEPSS rescore
  36. 2026-06-10 13:21 UTCEPSS rescore
  37. 2026-06-08 14:16 UTCEPSS rescore
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  39. 2026-06-07 15:24 UTCEPSS rescore
  40. 2026-06-06 13:47 UTCEPSS rescore
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  42. 2026-06-05 22:46 UTCEPSS rescore
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  44. 2026-06-05 06:10 UTCEPSS rescore
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  46. 2026-06-04 13:11 UTCEPSS rescore
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  48. 2026-06-02 20:12 UTCEPSS rescore
  49. 2026-06-02 20:12 UTCEPSS rescore
  50. 2026-06-01 13:51 UTCEPSS rescore
  51. 2026-06-01 13:51 UTCEPSS rescore
  52. 2026-05-31 22:30 UTCEPSS rescore
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  54. 2026-05-31 00:16 UTCEPSS rescore
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  56. 2026-05-29 13:44 UTCEPSS rescore
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  61. 2026-05-27 13:40 UTCEPSS rescore
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  65. 2026-05-26 13:43 UTCEPSS rescore
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  69. 2026-05-26 07:18 UTCEPSS rescore
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  72. 2026-05-26 07:18 UTCEPSS rescore
  73. 2026-05-24 16:56 UTCEPSS rescore
  74. 2026-05-23 15:20 UTCEPSS rescore
  75. 2026-05-22 21:16 UTCEPSS rescore

Frequently asked(5)

What is CVE-2025-20271?
CVE-2025-20271 is a high vulnerability published on June 18, 2025. A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gateway devices could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition in the Cisco AnyConnect service on an affected device. This vulnerability is due…
When was CVE-2025-20271 disclosed?
CVE-2025-20271 was first published in the National Vulnerability Database on June 18, 2025, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-20271 actively exploited?
CVE-2025-20271 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 38.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-20271?
CVE-2025-20271 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2025-20271?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-20271, 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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