CVE-2024-21411Network attack vector

Remote code execution via missing Today tab isolation

Published Mar 12, 2024 · Updated May 3, 2025

Remote code execution in Microsoft Skype for Consumer before 8.113 allows remote attackers to execute code after user interaction. The Today tab lacks context isolation, allowing attacker-controlled page or file content to execute in the Skype process. The target must visit a malicious page or open a malicious file; successful exploitation grants code execution with the user's privileges.

CVSS severity8.8
High
EPSS probability2.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Remote code execution in Microsoft Skype for Consumer before 8.113 allows remote attackers to execute code after user interaction. The Today tab lacks context isolation, allowing attacker-controlled page or file content to execute in the Skype process. The target must visit a malicious page or open a malicious file; successful exploitation grants code execution with the user's privileges.

The record

CVE
CVE-2024-21411
Published
Mar 12, 2024
Updated
May 3, 2025
Vendor
Microsoft
Product
Skype for Consumer
Classifications
CWE-453, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 12, 2024CVE publishedPublication date reported by the CVE source.
  2. May 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0 <8.113

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Skype for Consumerversion=1.0.0 <8.113

Published CVSS scores

8.8MicrosoftCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-453Insecure Default Variable Initialization
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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