fkie_nvd - fkie_cve-2025-3935

FKIE_CVE-2025-3935

Vulnerability from fkie_nvd - Published: 2025-04-25 19:15 - Updated: 2025-10-24 13:55

Severity ?

8.1 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
7.2 (High) - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

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.

References

URL	Tags
7d616e1a-3288-43b1-a0dd-0a65d3e70a49	https://www.connectwise.com/company/trust/advisories	Vendor Advisory
7d616e1a-3288-43b1-a0dd-0a65d3e70a49	https://www.connectwise.com/company/trust/security-bulletins/screenconnect-security-patch-2025.4	Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-3935	US Government Resource

Impacted products

	Vendor	Product	Version
	connectwise	screenconnect	*

JSON

To clipboard

{
  "cisaActionDue": "2025-06-23",
  "cisaExploitAdd": "2025-06-02",
  "cisaRequiredAction": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.",
  "cisaVulnerabilityName": "ConnectWise ScreenConnect Improper Authentication Vulnerability",
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:connectwise:screenconnect:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "552C1CC0-4F75-4C28-ACEF-EF1C1AD50EC2",
              "versionEndExcluding": "25.2.4",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "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."
    },
    {
      "lang": "es",
      "value": "Las versiones 25.2.3 y anteriores de ScreenConnect pueden ser susceptibles a un ataque de inyecci\u00f3n de c\u00f3digo de ViewState. Los formularios web ASP.NET utilizan ViewState para preservar el estado de las p\u00e1ginas y los controles, con datos codificados en Base64 protegidos por claves de m\u00e1quina. Es importante tener en cuenta que para obtener estas claves de m\u00e1quina, se requiere acceso privilegiado al sistema. Si estas claves de m\u00e1quina se ven comprometidas, los atacantes podr\u00edan crear y enviar un ViewState malicioso al sitio web, lo que podr\u00eda provocar la ejecuci\u00f3n remota de c\u00f3digo en el servidor. El riesgo no se debe a una vulnerabilidad introducida por ScreenConnect, sino a un comportamiento a nivel de plataforma. Esto no tuvo un impacto directo en el cliente de ScreenConnect. El parche 2025.4 de ScreenConnect deshabilita ViewState y elimina cualquier dependencia de \u00e9l."
    }
  ],
  "id": "CVE-2025-3935",
  "lastModified": "2025-10-24T13:55:32.970",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "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"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 5.9,
        "source": "7d616e1a-3288-43b1-a0dd-0a65d3e70a49",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.2,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "HIGH",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.2,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2025-04-25T19:15:49.143",
  "references": [
    {
      "source": "7d616e1a-3288-43b1-a0dd-0a65d3e70a49",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://www.connectwise.com/company/trust/advisories"
    },
    {
      "source": "7d616e1a-3288-43b1-a0dd-0a65d3e70a49",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://www.connectwise.com/company/trust/security-bulletins/screenconnect-security-patch-2025.4"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "US Government Resource"
      ],
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-3935"
    }
  ],
  "sourceIdentifier": "7d616e1a-3288-43b1-a0dd-0a65d3e70a49",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-502"
        }
      ],
      "source": "7d616e1a-3288-43b1-a0dd-0a65d3e70a49",
      "type": "Secondary"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2025-04-25 18:27 – Updated: 2025-10-21 22:55

Summary

Severity ?

8.1 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE

CWE-502 - Deserialization of Untrusted Data

Assigner

ConnectWise

References

URL

Tags

	https://www.connectwise.com/company/trust/securit…
	https://www.connectwise.com/company/trust/advisories

Impacted products

	Vendor	Product	Version
	ConnectWise	ScreenConnect	Affected: <25.2.3

Show details on NVD website

JSON

To clipboard

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            "other": {
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                "id": "CVE-2025-3935",
                "options": [
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                    "Exploitation": "active"
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                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-06-06T03:55:32.340641Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          },
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            "other": {
              "content": {
                "dateAdded": "2025-06-02",
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        "providerMetadata": {
          "dateUpdated": "2025-10-21T22:55:17.656Z",
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        "references": [
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            "tags": [
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            "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-3935"
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        "title": "CISA ADP Vulnrichment"
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    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "platforms": [
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          ],
          "product": "ScreenConnect",
          "vendor": "ConnectWise",
          "versions": [
            {
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      "impacts": [
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          "capecId": "CAPEC-115",
          "descriptions": [
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              "lang": "en",
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      "metrics": [
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          "scenarios": [
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        }
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    "dateReserved": "2025-04-25T14:32:25.365Z",
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}

Sightings

Author	Source	Type	Date

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.

Detection rules are retrieved from Rulezet.

Action not permitted

FKIE_CVE-2025-3935

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

Tags

Sightings

Nomenclature