What’s Vulnerable › Vulnerabilities

CVE-2021-41506

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-06-30 · updated 2026-06-17
• Weakness: CWE-287

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.

Affected products

• Xiongmaitech Ahb7008T-Mh-V2 Firmware: 4.02.r11.7601.nat.onvif.20170420
• Xiongmaitech Ahb7804R-Els Firmware: 4.02.r11.nat.onvif.20160422
• Xiongmaitech Ahb7804R-Lms Firmware: 4.02.r11.nat.20170301
• 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 Hi3518E 50H10L S39 Firmware: 4.02.r12.nat.onvifs.20170727

References

• https://github.com/Snawoot/hisilicon-dvr-telnet
• https://github.com/tothi/hs-dvr-telnet
• https://habr.com/en/post/486856/
• https://www.xiongmaitech.com/en/index.php/news/info/12/68
• https://github.com/Snawoot/hisilicon-dvr-telnet
• https://github.com/tothi/hs-dvr-telnet
• https://habr.com/en/post/486856/
• https://www.xiongmaitech.com/en/index.php/news/info/12/68

Get alerted when CVE-2021-41506 or the next vulnerability affects your stack