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Vulnerability record · CVE-2021-41506 · published 30 June 2022

CVE-2021-41506: Xiongmaitech ahb7008t-mh-v2 firmware improper authentication vulnerability

Xiongmaitech · Ahb7008t Mh V2 Firmware

Xiaongmai AHB7008T-MH-V2, AHB7804R-ELS, AHB7804R-MH-V2, AHB7808R-MS-V2, AHB7808R-MS, AHB7808T-MS-V2, AHB7804R-LMS, HI3518_50H10L_S39 V4.02.R11.7601.Nat.Onvif.20170420, V4.02.R11.Nat.Onvif.20160422, V4.02.R11.7601.Nat.Onvif.20170424, V4.02.R11.Nat.Onvif.20170327, V4.02.R11.Nat.Onvif.20161205, V4.02.R11.Nat.20170301, V4.02.R12.Nat.OnvifS.20170727 is affected by a backdoor in the macGuarder and dvrHelper binaries of DVR/NVR/IP camera firmware due to static root account credentials in the system.

9.8 CVSS 3.1 Critical EPSS 2.3% · top 16.8% CWE-287 · Improper authentication
9.8CVSS 3.1 base score, v2 10.0
2.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
8Affected product versions listed by NVD
8References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Xiaongmai AHB7008T-MH-V2, AHB7804R-ELS, AHB7804R-MH-V2, AHB7808R-MS-V2, AHB7808R-MS, AHB7808T-MS-V2, AHB7804R-LMS, HI3518_50H10L_S39 V4.02.R11.7601.Nat.Onvif.20170420, V4.02.R11.Nat.Onvif.20160422, V4.02.R11.7601.Nat.Onvif.20170424, V4.02.R11.Nat.Onvif.20170327, V4.02.R11.Nat.Onvif.20161205, V4.02.R11.Nat.20170301, V4.02.R12.Nat.OnvifS.20170727 is affected by a backdoor in the macGuarder and dvrHelper binaries of DVR/NVR/IP camera firmware due to static root account credentials in the system.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

8 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/Snawoot/hisilicon-dvr-telnet Third Party Advisory
https://github.com/tothi/hs-dvr-telnet Third Party Advisory
https://habr.com/en/post/486856/ ExploitThird Party Advisory
https://www.xiongmaitech.com/en/index.php/news/info/12/68 Vendor Advisory
https://github.com/Snawoot/hisilicon-dvr-telnet Third Party Advisory
https://github.com/tothi/hs-dvr-telnet Third Party Advisory
https://habr.com/en/post/486856/ ExploitThird Party Advisory
https://www.xiongmaitech.com/en/index.php/news/info/12/68 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-41506), CISA KEV, FIRST EPSS (scores of 2026-10-16). This page is refreshed as NVD updates the record.