CVE-2025-3935

HIGHNVD 8.19.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2025-06-02), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 8.1 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
8.1
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 3%CVSS: 8.1Exploit: NoneExposed: 0

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

ScreenConnect versions 25.2.3 and earlier versions may be susceptible to a ViewState code injection attack. ASP.NET Web Forms use ViewState to preserve page and control state, with data encoded using Base64 protected by machine keys.  It is important to note that to obtain these machine keys, privileged system level access must be obtained.

If these machine keys are compromised, attackers could create and send a malicious ViewState to the website, potentially leading to remote code execution on the server. 

The risk does not originate from a vulnerability introduced by ScreenConnect, but from platform level behavior.  This had no direct impact to ScreenConnect Client. ScreenConnect 2025.4 patch disables ViewState and removes any dependency on it.

CVSS v3
8.1
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: 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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS
87.5%
KEV
⚠ Exploited

Published

April 25, 2025

Last Modified

October 24, 2025

Advisory Details (1)

Auto-updated Jun 3, 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-2025-3935

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 48× in last 7d / 237× 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 450 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2025-3935?
CVE-2025-3935 is a high vulnerability published on April 25, 2025. ScreenConnect versions 25.2.3 and earlier versions may be susceptible to a ViewState code injection attack. ASP.NET Web Forms use ViewState to preserve page and control state, with data encoded using Base64 protected by machine keys. It is important to note that to obtain these machine keys,…
When was CVE-2025-3935 disclosed?
CVE-2025-3935 was first published in the National Vulnerability Database on April 25, 2025, with the most recent update on October 24, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-3935 actively exploited?
Yes. CISA added CVE-2025-3935 to the Known Exploited Vulnerabilities catalog on June 2, 2025, affecting ConnectWise ScreenConnect. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2025-3935?
CVE-2025-3935 has a CVSS v3 base score of 8.1 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2025-3935?
CVE-2025-3935 affects ConnectWise ScreenConnect. 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-2025-3935?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-3935, 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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