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Description

Shenzhen TVT Digital Technology Co., Ltd. NVMS-9000 firmware (used by many white-labeled DVR/NVR/IPC products) contains hardcoded API credentials and an OS command injection flaw in its configuration services. The web/API interface accepts HTTP/XML requests authenticated with a fixed vendor credential string and passes user-controlled fields into shell execution contexts without proper argument sanitization. An unauthenticated remote attacker can leverage the hard-coded credential to access endpoints such as /editBlackAndWhiteList and inject shell metacharacters inside XML parameters, resulting in arbitrary command execution as root. The same vulnerable backend is also reachable in some models through a proprietary TCP service on port 4567 that accepts a magic GUID preface and base64-encoded XML, enabling the same command injection sink. Firmware releases from mid-February 2018 and later are reported to have addressed this issue. Exploitation evidence was observed by the Shadowserver Foundation on 2025-01-28 UTC.

PUBLISHED Reserved 2025-11-24 | Published 2025-11-24 | Updated 2025-11-25 | Assigner VulnCheck




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

Problem types

CWE-798 Use of Hard-coded Credentials

CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Product status

Default status
unaffected

Any version before mid-February firmware builds
affected

Timeline

2018-04-09:Vulnerability is publicly disclosed via Seebug

Credits

mcw0 finder

References

web.archive.org/...914/http://en.tvt.net.cn:80/news/227.html vendor-advisory patch mitigation

github.com/...VR_RCE_Backdoor_and_Information_Disclosure.txt technical-description exploit

qkl.seebug.org/vuldb/ssvid-97217 exploit

blogs.juniper.net/...loiting-tvt-shenzhen-dvrs-still-lingers related

www.vulncheck.com/...d-api-credentials-and-command-injection third-party-advisory

cve.org (CVE-2018-25126)

nvd.nist.gov (CVE-2018-25126)

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