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CVE detail

CVE-2025-3935

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 8.1 · HighBuzz score 49.1KEV listed

Buzz score

Why this CVE is surfacing

Buzz score total 49.1

This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.

Buzz score components · mention 16.1 · diversity 8.0 · KEV 25.0 · OTX 0.0 · PoC 0.0
Mention score
16.1
4 evidence mentions in the snapshot
Diversity score
8.0
3 sources across 1 categories
KEV score
25.0
Known exploited vulnerability present
OTX score
0.0
0 OTX pulses
PoC score
0.0
0 repos · best confidence N/A
Best PoC traction
0
Maximum stars on a matched PoC repo

Why it matters now

Mention timeline

Total mentions
0
within the 30d window
Peak daily
0
highest bucket

Evidence

Source links by recency

Newest mentions first
4 source links · newest first
  • U.S. CISA adds ASUS RT-AX55 devices, Craft CMS, and ConnectWise ScreenConnect flaws to its Known Exploited Vulnerabilities catalogSecurity Affairs

    U.S. Cybersecurity and Infrastructure Security Agency (CISA) adds ASUS RT-AX55 devices, Craft CMS, and ConnectWise ScreenConnect flaws to its Known Exploited Vulnerabilities catalog. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added ASUS RT-AX55 devices, Craft CMS, and ConnectWise ScreenConnect flaws to its Known Exploited Vulnerabilities (KEV) catalog. Below are the descriptions for these flaws: Last […]

    newssecurityaffairs.comJun 3, 2025, 7:34 PM
  • Attackers breached ConnectWise, compromised customer ScreenConnect instancesHelp Net Security

    A suspected “sophisticated nation state actor” has compromised ScreenConnect cloud instances of a “very small number” of ConnectWise customers, the company has revealed on Wednesday. “We have not observed any additional suspicious activity in ScreenConnect cloud instances since the patch was released on April 24,” they added on Friday. The patch in question fixes CVE-2025-3935, a ViewState deserialization vulnerability affecting ScreenConnect versions 25.2.3 and earlier, which can allow attackers to inject malicious code and achieve … More →

    newswww.helpnetsecurity.comJun 2, 2025, 5:04 PM
  • ConnectWise Discloses Suspected State-Sponsored HackSecurityWeek

    The IT software provider says ScreenConnect users were impacted by the attack, which exploited a high-severity ASP.NET vulnerability.

    newswww.securityweek.comMay 30, 2025, 10:36 AM
  • ConnectWise suffered a cyberattack carried out by a sophisticated nation state actorSecurity Affairs

    ConnectWise detected suspicious activity linked to a nation-state actor, impacting a small number of its ScreenConnect customers. ConnectWise revealed it had detected suspicious activity linked to an advanced nation-state actor. The company confirmed that the attack impacted a small number of its ScreenConnect customers. “ConnectWise recently learned of suspicious activity within our environment that we […]

    newssecurityaffairs.comMay 30, 2025, 8:02 AM

Exploit code

Public exploit repository references

Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.

0 repository references · best confidence N/A · max 0 stars
No public PoC repositories have been matched yet.

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