CVE-2020-22253
About
Xiongmai Technology Co devices AHB7008T-MH-V2, AHB7804R-ELS, AHB7804R-MH-V2, AHB7808R-MS-V2, AHB7808R-MS, AHB7808T-MS-V2, AHB7804R-LMS, and HI3518E_50H10L_S39 were all discovered to have port 9530 open which allows unauthenticated attackers to make arbitrary Telnet connections with the victim device.
Rainforest analyst review
Across a range of Xiongmai DVR and surveillance devices, port 9530 sits open and lets an unauthenticated attacker open arbitrary Telnet connections to the device. In effect it's a backdoor-shaped exposure: reach the port, get an interactive path onto the box, no credentials required.
This is textbook botnet fuel. Cheap networked video devices are exactly what Mirai-class malware sweeps the internet for, and an unauthenticated path to device control at scale is the whole business model of those operations. Once on the device, the attacker has a foothold for further scanning, DDoS conscription, or lateral movement.
Our focus is reachability of that port and the sprawl problem these devices represent. They get deployed by the dozen, tracked by no one, and left facing the internet. The work is finding where port 9530 is exposed across affected models, then segmenting or blocking it, because inventory is the hard part, not understanding the bug.
References
Related CVEs
No related CVEs.
Frequently asked questions
What is CVE-2020-22253?
Xiongmai Technology Co devices AHB7008T-MH-V2, AHB7804R-ELS, AHB7804R-MH-V2, AHB7808R-MS-V2, AHB7808R-MS, AHB7808T-MS-V2, AHB7804R-LMS, and HI3518E_50H10L_S39 were all discovered to have port 9530 open which allows unauthenticated attackers to make arbitrary Telnet connections with the victim device.
How severe is CVE-2020-22253?
CVE-2020-22253 carries a CVSS 3.1 base score of 9.8, rated critical. On the Rainforest Risk Index — which weighs the severity alongside how easy the flaw is to reach and how broad its impact is — it scores 99 out of 100, in the critical band.
How is CVE-2020-22253 exploited?
According to the CVSS vector (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H): attack vector Network, attack complexity Low, privileges required None, user interaction None. Impact on confidentiality High, integrity High and availability High.
Which products are affected by CVE-2020-22253?
Public advisories list the following as affected: ahb7008t-mh-v2, ahb7008t-mh-v2 firmware, ahb7804r-els, ahb7804r-els firmware, ahb7804r-lms, ahb7804r-lms firmware, +10. Check the references on this page for the exact versions each vendor confirms.
How do I fix CVE-2020-22253?
Apply the fix the vendor published — the references on this page link to the primary advisories and patches. When patching can't happen right away, reduce the exposure of the affected component and watch it for exploitation attempts. Rainforest customers see this vulnerability correlated to their own assets and prioritized by real exposure, not by score alone.
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