CVE-2024-34121: Adobe Illustrator RCE Vulnerability

CVE-2024-34121 Overview

CVE-2024-34121 is an integer overflow vulnerability [CWE-190] in Adobe Illustrator affecting versions 28.6, 27.9.5, and earlier. The flaw allows arbitrary code execution in the context of the current user when a victim opens a malicious file. The issue affects Adobe Illustrator on both Microsoft Windows and Apple macOS platforms. Adobe addressed the vulnerability in security advisory APSB24-66.

Critical Impact
Attackers can execute arbitrary code with the privileges of the current user by tricking a victim into opening a crafted Illustrator file, potentially leading to full compromise of the affected workstation.

Affected Products

Adobe Illustrator 28.6 and earlier (2024 release)
Adobe Illustrator 27.9.5 and earlier (2023 release)
Microsoft Windows and Apple macOS host operating systems

Discovery Timeline

2024-09-13 - CVE-2024-34121 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-34121

Vulnerability Analysis

The vulnerability is an Integer Overflow or Wraparound flaw [CWE-190] triggered during the parsing of a malicious file in Adobe Illustrator. When Illustrator processes attacker-controlled data, an arithmetic operation exceeds the storage capacity of its integer type and wraps around to a smaller value. This miscalculation drives downstream memory operations, corrupting the process heap and enabling arbitrary code execution within the Illustrator process context.

The attack is local and requires user interaction: the victim must open the crafted file. No prior authentication is needed. Successful exploitation grants the attacker the same privileges as the user running Illustrator, which is typically a standard desktop user account. Confidentiality, integrity, and availability of the endpoint are all impacted.

Root Cause

The root cause is inadequate validation of numeric fields used to compute buffer sizes or offsets during file parsing. When a malformed field forces an arithmetic wrap, Illustrator allocates or indexes memory based on the truncated value. Subsequent copy or write operations exceed the intended bounds, corrupting adjacent heap structures and function pointers that attackers can hijack.

Attack Vector

An attacker crafts a malicious Illustrator project or asset file, such as an .ai, .eps, .svg, or related format, and delivers it through phishing, watering-hole sites, or shared design assets. When the victim opens the file in a vulnerable version of Illustrator, the parser triggers the integer overflow. See Adobe Security Advisory APSB24-66 for parser-level details.

Detection Methods for CVE-2024-34121

Indicators of Compromise

Unexpected child processes spawned by Illustrator.exe on Windows or Adobe Illustrator on macOS, particularly shells, script interpreters, or rundll32.exe.
Illustrator process crashes with heap corruption signatures logged in Windows Event Log or macOS crash reports shortly after opening an external file.
Outbound network connections initiated by the Illustrator process to previously unseen domains or IP addresses.
Creation of executables, scheduled tasks, or LaunchAgents by the Illustrator process in user-writable directories.

Detection Strategies

Hunt for anomalous parent-child process relationships where Illustrator spawns command interpreters or LOLBins.
Alert on Illustrator writing to autorun locations such as HKCU\Software\Microsoft\Windows\CurrentVersion\Run or ~/Library/LaunchAgents/.
Correlate Illustrator crash events with subsequent process creation or file-write telemetry on the same host.

Monitoring Recommendations

Enable full endpoint telemetry for the Illustrator process, including process, file, registry, and network events.
Track Illustrator version inventory across the fleet and flag hosts running versions at or below 28.6 and 27.9.5.
Monitor mail and web gateways for inbound Illustrator file formats from external senders and quarantine for sandbox detonation.

How to Mitigate CVE-2024-34121

Immediate Actions Required

Update Adobe Illustrator to the fixed versions listed in APSB24-66 on all Windows and macOS endpoints.
Instruct users not to open Illustrator files received from untrusted or unverified sources until patching is complete.
Verify that Adobe Creative Cloud auto-update is enabled to receive future Illustrator security releases.

Patch Information

Adobe released fixed builds of Illustrator alongside security bulletin APSB24-66 on September 10, 2024. Administrators should deploy the update through Adobe Creative Cloud, the Adobe Admin Console, or existing software distribution tooling such as Microsoft Intune or Jamf. Confirm remediation by verifying installed Illustrator versions exceed 28.6 and 27.9.5.

Workarounds

Restrict Illustrator file handling to trusted internal sources and block inbound .ai attachments at the mail gateway until patching completes.
Run Illustrator under standard user accounts, not administrators, to limit the impact of code execution.
Detonate untrusted design files in an isolated sandbox or virtual machine before opening them on production workstations.

bash

# Verify installed Illustrator version on macOS
defaults read "/Applications/Adobe Illustrator 2024/Adobe Illustrator.app/Contents/Info.plist" CFBundleShortVersionString

# Verify installed Illustrator version on Windows (PowerShell)
Get-ItemProperty "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*" |
  Where-Object { $_.DisplayName -like "Adobe Illustrator*" } |
  Select-Object DisplayName, DisplayVersion