CVE-2025-21134: Adobe Illustrator iPad RCE Vulnerability

CVE-2025-21134 Overview

CVE-2025-21134 is an integer underflow vulnerability [CWE-191] affecting Adobe Illustrator on iPad versions 3.0.7 and earlier. An attacker can achieve arbitrary code execution in the context of the current user by crafting a malicious file. Exploitation requires user interaction: the victim must open the malicious file in the vulnerable application. Adobe published the issue on January 14, 2025, and addressed it in security advisory APSB25-04.

Critical Impact

Successful exploitation results in arbitrary code execution within the user's session on the iPad, compromising the confidentiality, integrity, and availability of the affected application context.

Affected Products

• Adobe Illustrator on iPad 3.0.7 and earlier
• CPE: cpe:2.3:a:adobe:illustrator_on_ipad:*:*:*:*:*:*:*:*
• Component: adobe:illustrator_on_ipad

Discovery Timeline

• 2025-01-14 - CVE-2025-21134 published to NVD
• 2025-01-14 - Adobe releases security advisory APSB25-04
• 2025-09-09 - Last updated in NVD database

Technical Details for CVE-2025-21134

Vulnerability Analysis

The flaw is an integer underflow (wrap or wraparound) condition classified under [CWE-191]. Integer underflow occurs when an arithmetic operation produces a value below the minimum representable value for the integer type, wrapping around to a large value. In file-parsing code paths, this typically affects length, offset, or size calculations driven by attacker-controlled fields in a document.

When the wrapped value is subsequently used to allocate buffers, compute memory offsets, or bound copy operations, downstream memory corruption can occur. Adobe's advisory states the issue can lead to arbitrary code execution in the context of the current user. The affected component is the Illustrator on iPad application processing crafted document files.

Root Cause

The root cause is missing or insufficient validation of a numeric value used in size or boundary arithmetic during file parsing. A specially crafted input causes the underlying calculation to underflow, producing an out-of-range value that the application treats as valid. Adobe has not published the exact code path or file format field involved.

Attack Vector

The attack vector is local and requires user interaction. An attacker delivers a malicious Illustrator file through email, messaging, cloud storage, or a web download. When the victim opens the file in Illustrator on iPad 3.0.7 or earlier, the parser triggers the underflow and the attacker achieves code execution as the current user. No network connection to the attacker is required during exploitation.

No public proof-of-concept code is available. The vulnerability mechanism is documented in the Adobe Security Advisory APSB25-04.

Detection Methods for CVE-2025-21134

Indicators of Compromise

• Unexpected Illustrator file attachments received via email, messaging, or cloud-share links targeting iPad users.
• Illustrator on iPad processes crashing or terminating abnormally when opening external .ai or related vector files.
• Outbound network connections initiated by Illustrator immediately after a file open event, which deviate from normal application behavior.

Detection Strategies

• Inventory iPad fleet installations of Adobe Illustrator and flag any device running version 3.0.7 or earlier through mobile device management (MDM) reporting.
• Inspect file delivery channels (email gateways, MDM-managed file shares, content collaboration platforms) for Illustrator file types originating from untrusted senders.
• Correlate MDM application telemetry with anomalous post-open behavior such as application crashes or unusual process activity.

Monitoring Recommendations

• Enable crash and exception reporting on managed iPads to capture abnormal Illustrator terminations indicative of failed exploitation attempts.
• Monitor MDM compliance dashboards for Illustrator versions and enforce automatic updates from the App Store.
• Track delivery of vector graphics files to high-risk user groups such as designers and creative teams.

How to Mitigate CVE-2025-21134

Immediate Actions Required

• Update Adobe Illustrator on iPad to the version listed in Adobe Security Advisory APSB25-04 on all managed devices.
• Use MDM policies to enforce automatic application updates from the Apple App Store across the iPad fleet.
• Instruct users not to open Illustrator files from untrusted or unsolicited sources until devices are patched.

Patch Information

Adobe released a fixed version of Illustrator on iPad in security advisory APSB25-04. Administrators should consult the Adobe Security Advisory APSB25-04 for the exact fixed build number and apply it through the App Store or MDM-managed deployment.

Workarounds

• Restrict the delivery of Illustrator file types to iPad users through email gateway and MDM file-sharing policies until patching is complete.
• Require users to preview vector files on patched desktop systems before opening them on iPad.
• Where business needs allow, temporarily remove Illustrator on iPad from devices that cannot be updated promptly.

# Example MDM query to identify vulnerable Illustrator installations
# (pseudocode - adapt to your MDM platform's query syntax)
SELECT device_id, user, app_version
FROM managed_apps
WHERE bundle_id = 'com.adobe.IllustratorMobile'
  AND app_version <= '3.0.7';