CVE-2021-41506

Name: CVE-2021-41506
Creator: NVD / NIST
Published: 2022-06-30T13:15:08.35+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.75%

Last modified Jun 17, 2026

CVE-2021-41506 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 1.75% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

1.75%

75.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-287

Affected Software

Vendor	Product	Versions
Xiongmaitech	Ahb7008t-Mh-V2 Firmware	4.02.r11.7601.nat.onvif.20170420
Xiongmaitech	Ahb7804r-Els Firmware	4.02.r11.nat.onvif.20160422
Xiongmaitech	Ahb7804r-Mh-V2 Firmware	4.02.r11.7601.nat.onvif.20170424
Xiongmaitech	Ahb7808r-Ms-V2 Firmware	4.02.r11.nat.onvif.20170327
Xiongmaitech	Ahb7808r-Ms Firmware	4.02.r11.nat.onvif.20160328
Xiongmaitech	Ahb7808t-Ms-V2 Firmware	4.02.r11.nat.onvifc.20161205
Xiongmaitech	Ahb7804r-Lms Firmware	4.02.r11.nat.20170301
Xiongmaitech	Hi3518e 50h10l S39 Firmware	4.02.r12.nat.onvifs.20170727

References

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

Timeline

Published: Jun 30, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-41506?

How severe is CVE-2021-41506?

CVE-2021-41506 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.75% probability of exploitation in the next 30 days.

How do I fix CVE-2021-41506?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-41506?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST