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# C3RB3R Ransomware Exploits Unpatched Synology NAS Firmware
- URL: https://www.cyberdelegate.com/c3rb3r-ransomware-exploits-unpatched-synology-nas-firmware/
- Published: 2026-11-13T19:14:04.000Z
- Updated: 2026-11-13T19:14:04.000Z
- Description: Synology warns that outdated DSM versions leave NAS devices vulnerable to C3RB3R ransomware, urging immediate updates and network hardening.
- Author: The CyberDiplomat
- Tags: Ransomware & Data Breaches, Global, ransomware, Synology, NAS, CVE-2024-10441, CVE-2024-50629, CVE-2024-10445, #crawler

Synology has issued an urgent advisory after a wave of C3RB3R ransomware infections targeting Network Attached Storage (NAS) units that run outdated DiskStation Manager (DSM) firmware. The campaign leverages three known vulnerabilities – CVE‑2024‑10441, CVE‑2024‑50629 and CVE‑2024‑10445 – to gain remote code execution, read limited files and write data via the update mechanism. The ransomware encrypts stored files and demands payment in Bitcoin, with reports from South Korea indicating a typical ransom of roughly 0.037 BTC (about $3,000) per device.

## What triggered the outbreak

On 29 October 2026 Synology released advisory Synology‑SA‑24:20, listing the three CVEs and assigning internal identifiers ZDI‑CAN‑25403, ZDI‑CAN‑25613 and ZDI‑CAN‑25617\. The notice highlighted that any DSM build released before the December 2024 security patch – specifically versions earlier than 6.2.4‑25556‑8, 7.1.1‑42962‑7, 7.2‑64570‑4, 7.2.1‑69057‑6 and 7.2.2‑72806‑1 – is susceptible. Attackers exploit these flaws to infiltrate the management web interface, then deploy the ransomware payload.

![C3RB3R Ransomware Attack Flow](https://storage.ghost.io/c/ee/93/ee93f1a0-380d-4eb2-907e-2d9a0aade34c/content/images/2026/11/cluster_1668.figF.png)

Illustrates how C3RB3R ransomware infects and encrypts Synology NAS devices.

## How the ransomware spreads

The initial breach relies on remote code execution (CVE‑2024‑10441) to install a malicious component. Once inside, the adversary can read configuration files (CVE‑2024‑50629) and alter them via the update function (CVE‑2024‑10445), allowing the ransomware to encrypt user data across both home and enterprise NAS deployments. Victims have reported that the ransomware locks the entire storage volume, displaying a note demanding Bitcoin payment for decryption.

## Impact on users

Owners of Synology NAS devices that have not applied the December 2024 patch are at risk, regardless of whether the unit is used for personal backups or critical business data. In France, a Reddit user identified a compromised DS918+ model and linked the infection directly to CVE‑2024‑10441\. Korean users have confirmed ransom demands, while Synology’s own guidance urges customers to block external access to the management interface while the threat is active.

## What you should do

- **Update immediately:** Apply the latest DSM firmware released after December 2024\. Synology recommends enabling automatic updates to avoid future gaps.
- **Restrict remote access:** Disable or firewall the web management portal from the internet until the device is fully patched.
- **Back up securely:** Maintain offline or air‑gapped copies of critical data to mitigate the impact of encryption.
- **Monitor for abuse:** Be alert for phishing emails that reference personal files or ask for Bitcoin payments, as attackers may use leaked information to craft targeted scams.

While the exact number of compromised devices remains unknown, the advisory stresses that the vulnerabilities have existed since at least November 2024, and many users may have missed the critical fix. Prompt remediation not only protects data but also reduces the ransomware’s ability to spread further.

### Sources

- [CVE-2024-10441 (NVD)](https://nvd.nist.gov/vuln/detail/CVE-2024-10441?ref=cyberdelegate.com)
- [CVE-2024-10445 (NVD)](https://nvd.nist.gov/vuln/detail/CVE-2024-10445?ref=cyberdelegate.com)
- [CVE-2024-50629 (NVD)](https://nvd.nist.gov/vuln/detail/CVE-2024-50629?ref=cyberdelegate.com)
- [CVE-2026-13639 (NVD)](https://nvd.nist.gov/vuln/detail/CVE-2026-13639?ref=cyberdelegate.com)
- [CVE-2026-13684 (NVD)](https://nvd.nist.gov/vuln/detail/CVE-2026-13684?ref=cyberdelegate.com)
- [synology.com (official)](https://www.synology.com/en-global/company/news/article/C3RB3R/Synology%20urges%20users%20to%20update%20DSM%20following%20ransomware%20attacks%20on%20outdated%20DSM%20versions?ref=cyberdelegate.com)
- [synology.com (official)](https://www.synology.com/en-global/security/advisory/Synology%5FSA%5F24%5F20?ref=cyberdelegate.com)
- [synology.com (official)](https://www.synology.com/en-global/security/advisory/Synology%5FSA%5F24%5F23?ref=cyberdelegate.com)
- [synology.com (official)](https://www.synology.com/zh-tw/security/advisory/Synology%5FSA%5F24%5F20?ref=cyberdelegate.com)
- [BleepingComputer](https://www.bleepingcomputer.com/news/security/synology-warns-customers-of-ongoing-c3rb3r-ransomware-attacks/?ref=cyberdelegate.com)
- [France: rançongiciel (bing)](https://fr.cnet.com/cyberattaque/6136/ransomware-c3rb3r-mon-nas-synology-a-ete-chiffre-voici-comment-proteger-le-votre?ref=cyberdelegate.com)
- [South Korea: 랜섬웨어 (bing)](https://biz.chosun.com/it-science/ict/2026/10/30/JTZ6W2OV2FD6PCGHDD45GFSUXU/?ref=cyberdelegate.com)
- [France: rançongiciel (bing)](https://mezha.net/fr/news/mezha-0b7937717da36e2448caea37%5Fun-rancongiciel-frappe-un-synology-ds918/?ref=cyberdelegate.com)
- [France: rançongiciel (bing)](https://www.menow.fr/son-nas-est-pris-en-otage-le-correctif-oublie-existait-depuis-pres-de-deux-ans/?ref=cyberdelegate.com)

*This brief was prepared with AI assistance from the sources above and reviewed by our editors.*