CVE-2025-6543

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2025-06-30), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 sources updated this weekExploited in the wild
9.8EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • 564 internet-exposed hosts are running an affected version right now
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 10%CVSS: 9.8Exploit: cisa kev · ssvc active · epss top5pct · public exploitExposed: 564

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

Memory overflow vulnerability leading to unintended control flow and Denial of Service in NetScaler ADC and NetScaler Gateway when configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server

Live · internet exposure

564 internet-exposed hosts are running an affected version of CVE-2025-6543 right now.

across 15 countries (Australia, Lithuania, United Kingdom, Bulgaria, United States)top: netscaler_gateway
See the live KEV-Exposure radar →Found passively from public internet-scan data — aggregate, host-redacted.

EchelonGraph is the only CVE feed that fuses live vulnerability intelligence with its own live internet-exposure radar — so you see not just that a CVE is exploited, but how much of the internet is exposed to it right now.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
84(Attend)
EG Risk 84/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
10%
EPSS %ILE
95%
KEV
⚠ Exploited

Published

June 25, 2025

Last Modified

June 17, 2026

Advisory Details (2)

Auto-updated Jul 26, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-6543
generic

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https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694788

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 41× in last 7d / 225× 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 446 total refreshes for this CVE.

  1. 2026-07-27 05:58 UTCGHSA enrichment
  2. 2026-07-27 01:55 UTCGHSA enrichment
  3. 2026-07-26 21:53 UTCGHSA enrichment
  4. 2026-07-26 17:52 UTCGHSA enrichment
  5. 2026-07-26 13:50 UTCEG score recompute
  6. 2026-07-26 13:49 UTCGHSA enrichment
  7. 2026-07-26 09:48 UTCGHSA enrichment
  8. 2026-07-26 05:47 UTCGHSA enrichment
  9. 2026-07-26 01:46 UTCEG score recompute
  10. 2026-07-26 01:46 UTCGHSA enrichment
  11. 2026-07-25 14:17 UTCEPSS rescore
  12. 2026-07-25 14:17 UTCEPSS rescore
  13. 2026-07-24 14:17 UTCEPSS rescore
  14. 2026-07-23 14:18 UTCEPSS rescore
  15. 2026-07-23 14:18 UTCEPSS rescore
  16. 2026-07-23 03:01 UTCEG score recompute
  17. 2026-07-22 21:39 UTCEG score recompute
  18. 2026-07-22 21:39 UTCGHSA enrichment
  19. 2026-07-22 19:40 UTCCISA KEV update
  20. 2026-07-22 17:38 UTCEG score recompute
  21. 2026-07-22 17:38 UTCGHSA enrichment
  22. 2026-07-22 14:08 UTCEPSS rescore
  23. 2026-07-22 13:36 UTCGHSA enrichment
  24. 2026-07-22 09:35 UTCGHSA enrichment
  25. 2026-07-22 05:34 UTCGHSA enrichment
Show 75 more
  1. 2026-07-22 01:33 UTCGHSA enrichment
  2. 2026-07-21 21:31 UTCGHSA enrichment
  3. 2026-07-21 17:27 UTCEG score recompute
  4. 2026-07-21 17:27 UTCGHSA enrichment
  5. 2026-07-21 15:24 UTCEPSS rescore
  6. 2026-07-21 14:37 UTCCISA KEV update
  7. 2026-07-21 13:25 UTCGHSA enrichment
  8. 2026-07-21 09:24 UTCGHSA enrichment
  9. 2026-07-21 05:23 UTCGHSA enrichment
  10. 2026-07-21 01:22 UTCGHSA enrichment
  11. 2026-07-20 21:20 UTCGHSA enrichment
  12. 2026-07-20 17:18 UTCEG score recompute
  13. 2026-07-20 17:18 UTCGHSA enrichment
  14. 2026-07-20 17:08 UTCEPSS rescore
  15. 2026-07-20 13:17 UTCGHSA enrichment
  16. 2026-07-20 09:16 UTCGHSA enrichment
  17. 2026-07-20 05:14 UTCGHSA enrichment
  18. 2026-07-19 21:12 UTCGHSA enrichment
  19. 2026-07-19 17:11 UTCEG score recompute
  20. 2026-07-19 17:11 UTCGHSA enrichment
  21. 2026-07-19 14:30 UTCEPSS rescore
  22. 2026-07-19 14:30 UTCEPSS rescore
  23. 2026-07-19 13:09 UTCGHSA enrichment
  24. 2026-07-19 09:08 UTCGHSA enrichment
  25. 2026-07-19 05:07 UTCEG score recompute
  26. 2026-07-19 05:07 UTCGHSA enrichment
  27. 2026-07-19 02:28 UTCEPSS rescore
  28. 2026-07-19 02:28 UTCEPSS rescore
  29. 2026-07-19 01:06 UTCGHSA enrichment
  30. 2026-07-18 21:05 UTCGHSA enrichment
  31. 2026-07-18 17:04 UTCGHSA enrichment
  32. 2026-07-18 13:03 UTCEG score recompute
  33. 2026-07-18 13:03 UTCGHSA enrichment
  34. 2026-07-18 10:04 UTCEPSS rescore
  35. 2026-07-18 10:04 UTCEPSS rescore
  36. 2026-07-18 09:01 UTCGHSA enrichment
  37. 2026-07-18 05:00 UTCGHSA enrichment
  38. 2026-07-18 00:58 UTCGHSA enrichment
  39. 2026-07-17 20:57 UTCGHSA enrichment
  40. 2026-07-17 16:56 UTCGHSA enrichment
  41. 2026-07-17 12:54 UTCGHSA enrichment
  42. 2026-07-17 08:53 UTCEG score recompute
  43. 2026-07-17 08:53 UTCGHSA enrichment
  44. 2026-07-17 04:51 UTCGHSA enrichment
  45. 2026-07-17 00:49 UTCGHSA enrichment
  46. 2026-07-16 20:49 UTCGHSA enrichment
  47. 2026-07-16 17:04 UTCCISA KEV update
  48. 2026-07-16 17:02 UTCEPSS rescore
  49. 2026-07-16 17:02 UTCEPSS rescore
  50. 2026-07-16 16:47 UTCGHSA enrichment
  51. 2026-07-16 12:42 UTCGHSA enrichment
  52. 2026-07-16 08:40 UTCGHSA enrichment
  53. 2026-07-16 04:39 UTCGHSA enrichment
  54. 2026-07-16 00:37 UTCGHSA enrichment
  55. 2026-07-15 20:36 UTCGHSA enrichment
  56. 2026-07-15 16:57 UTCEPSS rescore
  57. 2026-07-15 16:57 UTCEPSS rescore
  58. 2026-07-15 16:49 UTCCISA KEV update
  59. 2026-07-15 16:35 UTCGHSA enrichment
  60. 2026-07-15 15:04 UTCCISA KEV update
  61. 2026-07-15 12:33 UTCGHSA enrichment
  62. 2026-07-15 08:33 UTCGHSA enrichment
  63. 2026-07-15 04:31 UTCGHSA enrichment
  64. 2026-07-15 02:00 UTCEPSS rescore
  65. 2026-07-15 01:59 UTCEPSS rescore
  66. 2026-07-15 00:29 UTCGHSA enrichment
  67. 2026-07-14 20:28 UTCGHSA enrichment
  68. 2026-07-14 18:05 UTCCISA KEV update
  69. 2026-07-14 16:27 UTCGHSA enrichment
  70. 2026-07-14 12:26 UTCGHSA enrichment
  71. 2026-07-14 08:25 UTCGHSA enrichment
  72. 2026-07-14 04:24 UTCGHSA enrichment
  73. 2026-07-14 00:23 UTCGHSA enrichment
  74. 2026-07-13 20:22 UTCGHSA enrichment
  75. 2026-07-13 17:07 UTCCISA KEV update

Publicly available exploits

(2 references)

Working exploit code is in the public domain (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCabrewer251/CVE-2025-6543_CitrixNetScaler_PoC
    First seen Jul 3, 2025

    Multi-host, multi-port scanner and auditor for CVE-2025-6543-affected NetScaler devices. Supports SNMP and SSH enumeration with optional CSV reporting and exploit stubs.

    Open source ↗
  • GitHub PoCgrupooruss/Citrix-cve-2025-6543
    First seen Jun 26, 2025

    Script para determinar si Citrix es vulnerable al CVE-2025-6543

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2025-6543?
CVE-2025-6543 is a critical vulnerability published on June 25, 2025. Memory overflow vulnerability leading to unintended control flow and Denial of Service in NetScaler ADC and NetScaler Gateway when configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server
When was CVE-2025-6543 disclosed?
CVE-2025-6543 was first published in the National Vulnerability Database on June 25, 2025, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-6543 actively exploited?
Yes. CISA added CVE-2025-6543 to the Known Exploited Vulnerabilities catalog on June 30, 2025, affecting Citrix NetScaler ADC and Gateway. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2025-6543?
CVE-2025-6543 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2025-6543?
CVE-2025-6543 affects Citrix NetScaler ADC and Gateway. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2025-6543?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-6543, 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.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2025-6543

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