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CVE-2021-47960 affects Synology SSL VPN Client versions before 1.4.5-0684. The vulnerability is a files or directories accessible to external parties issue in which a local HTTP server bound to the loopback interface exposes files within the client's installation directory. A remote attacker can leverage browser-based access to this localhost service by inducing the victim to interact with a crafted web page while the vulnerable client is present. Successful exploitation allows retrieval of sensitive files from the installation directory, including configuration files, certificates, and logs, resulting in information disclosure.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
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.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An improper access control vulnerability in Synology SSL VPN Client that allows remote attackers to read sensitive files from the client installation directory via user interaction with a malicious web page.
A files-or-directories-accessible-to-external-parties vulnerability in Synology SSL VPN Client that can expose sensitive files from the installation directory via a local HTTP server bound to loopback, requiring user interaction with a crafted web page.
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.