CVE-2023-29330Network attack vector

Remote code execution via meeting-triggered use-after-free

Published Aug 8, 2023 · Updated Aug 10, 2026

Use-after-free in Microsoft Teams clients allows remote attackers to execute code by luring a user into an attacker-controlled meeting. Microsoft identifies a use-after-free but has not disclosed the affected component or the operation that reuses freed memory. Exploitation requires the victim to join the meeting and runs code in that victim's user context; affected bounds differ across Android, iOS, Windows, and macOS clients.

CVSS severity8.8
High
EPSS probability1.98%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Microsoft Teams clients allows remote attackers to execute code by luring a user into an attacker-controlled meeting. Microsoft identifies a use-after-free but has not disclosed the affected component or the operation that reuses freed memory. Exploitation requires the victim to join the meeting and runs code in that victim's user context; affected bounds differ across Android, iOS, Windows, and macOS clients.

The record

CVE
CVE-2023-29330
Published
Aug 8, 2023
Updated
Aug 10, 2026
Vendor
Microsoft
Product
Microsoft Teams for Android
Classifications
CWE-416, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 8, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 2026Record 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 <1.0.0.2023070204

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft Teams for Androidversion=1.0.0 <1.0.0.2023070204
Microsoft · Microsoft Teams for Desktopversion=1.0.0 <1.6.00.18681
Microsoft · Microsoft Teams for iOSversion=2.0.0 <5.12.1
Microsoft · Microsoft Teams for Macversion=1.0.0.0 <1.6.00.17554

Published CVSS scores

7.7Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
8.8Microsoft CorporationCVSS: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-416Use After Free
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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