CVE-2023-27934Public exploitNetwork attack vector

Authenticated code execution via uninitialized deallocator pointer

Published May 8, 2023 · Updated Nov 4, 2025

Heap overflow in Apple macOS dcerpc before Ventura 13.3 and Monterey 12.6.4 allows remote authenticated users to execute arbitrary code. A MAYBE-flagged RPC call leaves an iovector count uninitialized in rpc__cn_call_end, so cleanup indexes beyond the call representation and invokes an uninitialized deallocator pointer. The network path requires SMB authentication; a regular local user can reach the same flaw through a UNIX socket, leading to a process crash or code execution.

CVSS severity7.5
High
EPSS probability1.79%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap overflow in Apple macOS dcerpc before Ventura 13.3 and Monterey 12.6.4 allows remote authenticated users to execute arbitrary code. A MAYBE-flagged RPC call leaves an iovector count uninitialized in rpc__cn_call_end, so cleanup indexes beyond the call representation and invokes an uninitialized deallocator pointer. The network path requires SMB authentication; a regular local user can reach the same flaw through a UNIX socket, leading to a process crash or code execution.

The record

CVE
CVE-2023-27934
Published
May 8, 2023
Updated
Nov 4, 2025
Vendor
Apple
Product
macOS
Classifications
CWE-457, T1210
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 8, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 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=unspecified <12.6
  2. Affected versionversion=unspecified <13.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Apple · macOSversion=unspecified <12.6; version=unspecified <13.3

Published CVSS scores

7.5Cisco TalosCVSS:3.1/AV:N/AC:H/PR:L/UI:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-457Use of Uninitialized Variable
T1210Exploitation of Remote Services

Public exploit references

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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