CVE-2025-34252Known exploitationNetwork attack vector

Remote code execution via DNS-activated malicious library

Published Oct 7, 2025 · Updated Oct 7, 2025

Embedded malicious code in five NetSarang 5.0 applications allows remote attackers to execute code through a DNS-activated backdoor. The signed nssock2.dll in Xmanager Enterprise Build 1232, Xmanager Build 1045, Xshell Build 1322, Xftp Build 1218, and Xlpd Build 1220 queries month-derived domains and accepts a TXT-delivered key that decrypts its second stage. Execution requires installation and launch of a trojanized build; once activated, the library downloads and runs code and stores encrypted payloads in a registry-backed VFS.

CVSS severity9.3
Critical
EPSS probabilityUnavailable
No score available in this record
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Embedded malicious code in five NetSarang 5.0 applications allows remote attackers to execute code through a DNS-activated backdoor. The signed nssock2.dll in Xmanager Enterprise Build 1232, Xmanager Build 1045, Xshell Build 1322, Xftp Build 1218, and Xlpd Build 1220 queries month-derived domains and accepts a TXT-delivered key that decrypts its second stage. Execution requires installation and launch of a trojanized build; once activated, the library downloads and runs code and stores encrypted payloads in a registry-backed VFS.

The record

CVE
CVE-2025-34252
Published
Oct 7, 2025
Updated
Oct 7, 2025
Vendor
NetSarang Computer, Inc.
Product
Xshell
Classifications
CWE-506, T1112, T1105, T1195.002, T1071.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2017Exploitation reportedActivated ShadowPad payload in a Hong Kong company
  2. Oct 7, 2025CVE publishedPublication date reported by the CVE source.
  3. Oct 7, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.0 Build 1322

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

NetSarang Computer, Inc. · Xshellversion=5.0 Build 1322
NetSarang Computer, Inc. · Xmanager Enterpriseversion=5.0 Build 1232
NetSarang Computer, Inc. · Xlpdversion=5.0 Build 1220
NetSarang Computer, Inc. · Xmanagerversion=5.0 Build 1045
NetSarang Computer, Inc. · Xftpversion=5.0 Build 1218

Published CVSS scores

9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-506Embedded Malicious Code
T1112Modify Registry
T1105Ingress Tool Transfer
T1195.002Compromise Software Supply Chain
T1071.004DNS

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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