CVE-2025-3935 (GCVE-0-2025-3935)

Vulnerability from cvelistv5 – Published: 2025-04-25 18:27 – Updated: 2026-02-26 18:28
VLAI CISA Previdian
Title
ScreenConnect Exposure to ASP.NET ViewState Code Injection
Summary
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.
Severity
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: active Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-06-06 03:55 UTC
CWE
  • CWE-502 - Deserialization of Untrusted Data
Assigner
ConnectWise CNA under the mitre root
CNA scorecard – unranked: 4 records in the last 180 days, 10 needed details
References
Impacted products
Vendor Product Version CPE status
ConnectWise ScreenConnect Affected: <25.2.3
guessed Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 9e9e1dad-6765-40a9-a72e-d33c215eeac1

Vulnerability ID: CVE-2025-3935

Status: Confirmed

Status Updated: 2025-06-02 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2025-06-02
Asserted: 2025-06-02
Scope
Notes: ConnectWise ScreenConnect Improper Authentication Vulnerability | Affected: ConnectWise / ScreenConnect | Description: ConnectWise ScreenConnect contains an improper authentication vulnerability. This vulnerability could allow a ViewState code injection attack, which could allow remote code execution if machine keys are compromised. | Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. | Due date: 2025-06-23 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://www.connectwise.com/company/trust/security-bulletins/screenconnect-security-patch-2025.4 ; https://nvd.nist.gov/vuln/detail/CVE-2025-3935
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-287
Feed CISA Known Exploited Vulnerabilities Catalog
Product ScreenConnect
Due Date 2025-06-23
Date Added 2025-06-02
Vendorproject ConnectWise
Vulnerabilityname ConnectWise ScreenConnect Improper Authentication Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 12:25 UTC | Updated: 2026-11-04 13:37 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 0f8bbc34-4f69-4f58-af71-13daf9046077

Vulnerability ID: CVE-2025-3935

Status: Confirmed

Status Updated: 2026-06-01 10:31 UTC

Exploited: Yes

Timestamps
First Seen: 2026-06-01
Asserted: 2026-06-01
Scope
Notes: KEVIntel entry: ScreenConnect Exposure to ASP.NET ViewState Code Injection | Affected: ConnectWise / ScreenConnect | CVSS: 8.1 (HIGH) | EPSS: 0.03348 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title ScreenConnect Exposure to ASP.NET ViewState Code Injection
Vendor ConnectWise
Product ScreenConnect
Added Date 2026-06-01T10:31:13.860Z
Cvss Score 8.1
Epss Score 0.03348
Cvss Severity HIGH
Epss Percentile 0.8711
Used In Malware unknown
Ahead Of Cisa Kev 
{
  "count": 1,
  "unit": "day"
}
Not Yet In Cisa Kev False
References
Created: 2026-06-23 14:03 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website
To clipboard 

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              "value": "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.\u00a0\nIt is important to note that to obtain these machine keys, privileged system level access must be obtained. \n\n\n\nIf 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.\u00a0\n\n\n\nThe risk does not originate from a vulnerability introduced by ScreenConnect, but from platform level behavior.\u00a0 This had no direct impact to ScreenConnect Client.\u00a0ScreenConnect 2025.4 patch disables ViewState and removes any dependency on it."
            }
          ],
          "impacts": [
            {
              "capecId": "CAPEC-115",
              "descriptions": [
                {
                  "lang": "en",
                  "value": "CAPEC-115 Authentication Bypass"
                }
              ]
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 8.1,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-502",
                  "description": "CWE-502 Deserialization of Untrusted Data",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2025-09-03T16:31:13.339Z",
            "orgId": "7d616e1a-3288-43b1-a0dd-0a65d3e70a49",
            "shortName": "ConnectWise"
          },
          "references": [
            {
              "url": "https://www.connectwise.com/company/trust/security-bulletins/screenconnect-security-patch-2025.4"
            },
            {
              "url": "https://www.connectwise.com/company/trust/advisories"
            }
          ],
          "solutions": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "\u003cp\u003e\u003c/p\u003e\u003cb\u003eCloud:\u0026nbsp;\u003c/b\u003eNo action is required. \u003cbr\u003e\u003cbr\u003e\u003cb\u003eOn-premises:\u0026nbsp;\u003c/b\u003eUpgrade to the latest stable version.\u003cbr\u003e\n\n\n\n\n\n\n\n\n\n\u003cp\u003eDetails and guidance can be found here:\n\n\u003ca target=\"_blank\" rel=\"nofollow\" href=\"https://www.connectwise.com/company/trust/security-bulletins/screenconnect-security-patch-2025.4\"\u003eScreenConnect 25.2.4 Security Patch\u003c/a\u003e\n\n\u003c/p\u003e\n\n\n\n\n\u003cbr\u003e"
                }
              ],
              "value": "Cloud:\u00a0No action is required. \n\nOn-premises:\u00a0Upgrade to the latest stable version.\n\n\n\n\n\n\n\n\n\n\nDetails and guidance can be found here:\n\n ScreenConnect 25.2.4 Security Patch https://www.connectwise.com/company/trust/security-bulletins/screenconnect-security-patch-2025.4"
            }
          ],
          "source": {
            "discovery": "UNKNOWN"
          },
          "title": "ScreenConnect Exposure to ASP.NET ViewState Code Injection",
          "x_generator": {
            "engine": "Vulnogram 0.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "7d616e1a-3288-43b1-a0dd-0a65d3e70a49",
        "assignerShortName": "ConnectWise",
        "cveId": "CVE-2025-3935",
        "datePublished": "2025-04-25T18:27:44.244Z",
        "dateReserved": "2025-04-25T14:32:25.365Z",
        "dateUpdated": "2025-10-21T22:55:17.656Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


Solutions

CNA · ConnectWise
Cloud: No action is required. On-premises: Upgrade to the latest stable version. Details and guidance can be found here: ScreenConnect 25.2.4 Security Patch https://www.connectwise.com/company/trust/security-bulletins/screenconnect-security-patch-2025.4

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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.