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CVE Record

CVE-2020-24772: In Dreamacro Clash for Windows v0.11.4, an attacker could embed a malicious iframe in a website with a craf...

In Dreamacro Clash for Windows v0.11.4, an attacker could embed a malicious iframe in a website with a crafted URL that would launch the Clash Windows client and force it to open a remote SMB share. Windows will perform NTLM authentication when opening the SMB share and that request can be relayed (using a tool like responder) for code execution (or captured for hash cracking).

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2020-24772 affects Dreamacro Clash for Windows v0.11.4. A malicious website could trigger the Windows client to open a remote SMB share, causing Windows to send NTLM authentication. That credential material could be relayed or cracked, potentially leading to account compromise or code execution.

Executive priority

Prioritize discovery and containment on Windows workstations because the business impact is credential exposure and possible code execution. Urgency is lower than a confirmed exploited KEV item, but the authentication-relay impact justifies prompt action where the product is present.

Technical view

The issue is described as a crafted URL embedded in an iframe that launches Clash for Windows and causes access to a remote SMB share. Windows then performs NTLM authentication to that share. The CVE record does not provide CVSS, CWE, patch details, or a list of affected versions beyond v0.11.4.

Likely exposure

Known exposure is Windows endpoints running Dreamacro Clash for Windows v0.11.4. The sources do not identify other affected versions, CPEs, or downstream products, so broader exposure should be treated as unconfirmed until vendor guidance is reviewed.

Exploitation context

CISA KEV status is false, and the provided sources do not claim active exploitation. The attack context is user interaction with a malicious webpage that can launch the client and trigger outbound SMB authentication, creating NTLM relay or credential-capture risk.

Researcher notes

Evidence is limited to the CVE description and a GitHub issue reference. No CVSS vector, CWE mapping, patch version, or active exploitation evidence is included in the supplied bundle. Avoid extending affected-version claims beyond Clash for Windows v0.11.4 without additional vendor evidence.

Mitigation direction

  • Identify endpoints running Clash for Windows v0.11.4.
  • Review Dreamacro guidance and issue history for fixed versions or workarounds.
  • Upgrade or remove affected installations where vendor guidance supports it.
  • Restrict outbound SMB from workstations where operationally feasible.
  • Harden NTLM use according to existing Windows security policy.

Validation and detection

  • Inventory installed Clash for Windows versions on managed endpoints.
  • Check whether affected systems can initiate outbound SMB to untrusted networks.
  • Review proxy/client launch associations for unexpected URL handling behavior.
  • Monitor authentication logs for unusual NTLM attempts to external SMB hosts.
  • Confirm remediation against vendor-published guidance when available.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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ATT&CK lookup starting points

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description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2020-24772 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.