Is CVE-2021-41506 actively exploited?

Yes. CVE-2021-41506 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-41506 be exploited remotely?

The attack vector of CVE-2021-41506 has not been classified yet.

What is the CVSS score of CVE-2021-41506?

CVE-2021-41506 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-41506

UNKNOWNCISA KEVIN THE WILD

CVE-2021-41506

Published: April 11, 2026

EPSS:1.13%probability of exploitation in 30 daysPercentile:78.4th

Official 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.

NVD Source

Technical Analysis

CVE-2021-41506 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2021-41506 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.