CVE-2017-20203NetSarang v5.0 Malicious Backdoor Supply Chain Compromise
Updated under an hour ago ()
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It affects NetSarang Computer, Inc. Xmanager Enterprise and 4 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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NetSarang Xmanager Enterprise 5.0 Build 1232, Xmanager 5.0 Build 1045, Xshell 5.0 Build 1322, Xftp 5.0 Build 1218, and Xlpd 5.0 Build 1220 contain a malicious nssock2.dll that implements a multi-stage, DNS-based backdoor. The dormant library contacts a C2 DNS server via a specially crafted TXT record for a month‑generated domain. After receiving a decryption key, it then downloads and executes arbitrary code, creates an encrypted virtual file system (VFS) in the registry, and grants the attacker full remote code execution, data exfiltration, and persistence. NetSarang released builds for each product line that remediated the compromise: Xmanager Enterprise Build 1236, Xmanager Build 1049, Xshell Build 1326, Xftp Build 1222, and Xlpd Build 1224. Kaspersky Lab identified an instance of exploitation in the wild in August 2017.
- CVSS
- 9.3 CRITICAL (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
- Weakness (CWE)
- CWE-506
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Nov 21, 2025
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
NetSarang Computer, Inc. Xmanager Enterprise netsarang_computer:xmanager_enterprise (from the name) | 5.0 Build 1232 | CNA record |
NetSarang Computer, Inc. Xmanager netsarang_computer:xmanager (from the name) | 5.0 Build 1045 | CNA record |
NetSarang Computer, Inc. Xshell netsarang_computer:xshell (from the name) | 5.0 Build 1322 | CNA record |
NetSarang Computer, Inc. Xftp netsarang_computer:xftp (from the name) | 5.0 Build 1218 | CNA record |
NetSarang Computer, Inc. Xlpd netsarang_computer:xlpd (from the name) | 5.0 Build 1220 | CNA record |
References
- https://web.archive.org/web/20181022035109/https://www.netsarang.com/news/security_exploit_in_july_18_2017_build.htmlvendor-advisory, patch
- https://usa.kaspersky.com/about/press-releases/shadowpad-attackers-hid-backdoor-in-software-used-by-hundreds-of-large-companies-worldwidetechnical-description
- https://securelist.com/shadowpad-in-corporate-networks/81432/technical-description
- https://www.vulncheck.com/advisories/netsarang-malicious-backdoor-supply-chain-compromisethird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.