CVE-2024-41879: Adobe Acrobat Reader RCE Vulnerability

CVE-2024-41879 Overview

CVE-2024-41879 is an out-of-bounds write vulnerability [CWE-787] affecting Adobe Acrobat Reader versions 127.0.2651.105 and earlier. The flaw allows attackers to execute arbitrary code in the context of the current user when a victim opens a malicious PDF document. Exploitation requires user interaction, limiting large-scale automated attacks but remaining effective in targeted phishing campaigns. The vulnerability also impacts Microsoft Edge, which integrates Acrobat-based PDF rendering components.

Critical Impact
Successful exploitation leads to arbitrary code execution with the privileges of the user opening the crafted PDF, enabling malware deployment, credential theft, and lateral movement.

Affected Products

Adobe Acrobat Reader versions 127.0.2651.105 and earlier
Microsoft Edge (PDF rendering component)
Systems processing untrusted PDF files with vulnerable Acrobat versions

Discovery Timeline

2024-08-26 - CVE-2024-41879 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-41879

Vulnerability Analysis

The vulnerability is an out-of-bounds write condition classified under [CWE-787]. Acrobat Reader writes data past the boundaries of an allocated memory buffer during PDF parsing. This memory corruption can overwrite adjacent structures such as function pointers, object metadata, or heap control data. Attackers craft PDF files containing malformed objects that trigger the write primitive during document processing. Once heap layout is manipulated, the attacker gains control of execution flow. Because Acrobat Reader parses complex document structures including embedded fonts, JavaScript, and multimedia streams, the attack surface for boundary condition errors is significant.

Root Cause

The root cause is improper validation of size or index values when writing to a buffer during PDF object parsing. The vulnerable code path fails to enforce boundary checks before performing memory writes, allowing attacker-controlled data to corrupt adjacent memory. This class of flaw remains common in native code handling untrusted binary formats.

Attack Vector

The attack vector is local and requires user interaction. An attacker delivers a malicious PDF through phishing email, drive-by download, or a compromised file share. When the victim opens the file in Acrobat Reader or a Chromium-based browser using the Acrobat rendering component, the malformed PDF triggers the out-of-bounds write. Code executes with the privileges of the current user.

See the Microsoft Security Update Guide for CVE-2024-41879 for vendor-authored technical details. No public proof-of-concept exploit is available at this time.

Detection Methods for CVE-2024-41879

Indicators of Compromise

Unexpected child processes spawned by AcroRd32.exe or Acrobat.exe, such as cmd.exe, powershell.exe, or rundll32.exe
Crash events referencing Acrobat Reader modules in the Windows Application event log
Suspicious PDF files delivered via email attachments or downloaded from untrusted domains
Outbound network connections initiated by Acrobat Reader processes to unknown hosts

Detection Strategies

Monitor process lineage for Acrobat Reader spawning shell interpreters or scripting hosts
Inspect PDF files for malformed object streams, unusual JavaScript payloads, or oversized stream lengths
Correlate email gateway telemetry with endpoint file execution events to identify malicious PDF delivery

Monitoring Recommendations

Enable enhanced logging on endpoint detection tooling for memory corruption events tied to Acrobat processes
Track version inventory across managed endpoints to identify hosts running Acrobat Reader 127.0.2651.105 or earlier
Alert on PDF files opened from user download directories immediately followed by process injection or persistence activity

How to Mitigate CVE-2024-41879

Immediate Actions Required

Update Adobe Acrobat Reader to a version newer than 127.0.2651.105 on all endpoints
Apply the corresponding Microsoft Edge update per the Microsoft Security Update Guide for CVE-2024-41879
Block inbound PDF attachments from untrusted external senders at the email gateway until patching completes
Enable Protected View and Protected Mode in Acrobat Reader to sandbox PDF processing

Patch Information

Adobe released fixes for affected Acrobat Reader versions. Microsoft distributed corresponding updates for Edge through its standard update channels. Reference the Microsoft Security Update Guide for CVE-2024-41879 for build numbers and deployment guidance.

Workarounds

Configure Acrobat Reader to open PDF files in Protected View by default for all files from untrusted locations
Disable JavaScript execution in Acrobat Reader through the Enhanced Security settings
Restrict PDF handler associations to sandboxed viewers where possible
Deploy application allow-listing to prevent Acrobat processes from launching command interpreters

bash

# Registry example: Force Protected View for all files in Acrobat Reader
reg add "HKCU\Software\Adobe\Acrobat Reader\DC\TrustManager" /v iProtectedView /t REG_DWORD /d 2 /f

# Disable JavaScript in Acrobat Reader
reg add "HKCU\Software\Adobe\Acrobat Reader\DC\JSPrefs" /v bEnableJS /t REG_DWORD /d 0 /f