3CX DesktopApp Supply Chain Compromise
CVE-2023-29059 refers to a supply-chain compromise of the 3CX DesktopApp in which legitimate, digitally signed Windows and macOS application builds were distributed with embedded malicious code. Affected versions include Windows Electron DesktopApp builds 18.12.407 and 18.12.416 shipped in Update 7, and macOS Electron DesktopApp builds 18.11.1213, 18.12.402, 18.12.407, and 18.12.416. On Windows, the malicious activity was delivered through a DLL sideloading chain involving 3CXDesktopApp.exe, a clean loader d3dcompiler_47.dll, and a maliciously patched ffmpeg.dll containing appended encrypted payload data and logic to retrieve additional encoded content from attacker-controlled infrastructure, including GitHub raw content paths. On macOS, the trojanized component was libffmpeg.dylib. The malicious ffmpeg library remained functional while executing added code, used a manifest/timestamp-based delay mechanism of up to roughly 28 days before contacting external infrastructure, and ultimately delivered follow-on payloads including a browser-targeting infostealer. The issue was exploited in the wild in March 2023.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability affecting vulnerable 3CX Desktop App 18.12.x versions, specifically 18.12.407 and 18.12.416, associated with the 3CX supply chain attack and potentially enabling unauthorized access, code execution, or further system compromise.
A specific vulnerability identifier referenced in the context of the 3CX supply chain attack detection content.
A code execution vulnerability affecting 3CX referenced as leveraged by threat actors.
A supply-chain compromise of the 3CX DesktopApp (Windows/macOS) in which digitally signed installers/bundled components were trojanized (notably via DLL sideloading using a maliciously patched ffmpeg.dll / libffmpeg.dylib) to contact attacker C2 and retrieve additional payloads (including an infostealer).
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.