CVE-2021-41506

Exp

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.

Published: 2022-06-30 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-41506 is rated High Exploit Risk (82.4/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 2.11%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2021-41506

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2021-41506

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-27 1.75% 2.11% +0.35%
2 2026-06-15 1.13% 1.75% +0.62%
3 2026-03-10 — 1.13% —

Full EPSS history (19 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-41506

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
10.0 2.0 HIGH
AV:N/AC:L/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 10.0 [email protected]

Weakness enumeration for CVE-2021-41506

Affected software / configurations for CVE-2021-41506

Vendor Product Version Raw CPE
xiongmaitech ahb7008t-mh-v2_firmware 4.02.r11.7601.nat.onvif.20170420 cpe:2.3:o:xiongmaitech:ahb7008t-mh-v2_firmware:4.02.r11.7601.nat.onvif.20170420:*:*:*:*:*:*:*
xiongmaitech ahb7804r-els_firmware 4.02.r11.nat.onvif.20160422 cpe:2.3:o:xiongmaitech:ahb7804r-els_firmware:4.02.r11.nat.onvif.20160422:*:*:*:*:*:*:*
xiongmaitech ahb7804r-mh-v2_firmware 4.02.r11.7601.nat.onvif.20170424 cpe:2.3:o:xiongmaitech:ahb7804r-mh-v2_firmware:4.02.r11.7601.nat.onvif.20170424:*:*:*:*:*:*:*
xiongmaitech ahb7808r-ms-v2_firmware 4.02.r11.nat.onvif.20170327 cpe:2.3:o:xiongmaitech:ahb7808r-ms-v2_firmware:4.02.r11.nat.onvif.20170327:*:*:*:*:*:*:*
xiongmaitech ahb7808r-ms_firmware 4.02.r11.nat.onvif.20160328 cpe:2.3:o:xiongmaitech:ahb7808r-ms_firmware:4.02.r11.nat.onvif.20160328:*:*:*:*:*:*:*
xiongmaitech ahb7808t-ms-v2_firmware 4.02.r11.nat.onvifc.20161205 cpe:2.3:o:xiongmaitech:ahb7808t-ms-v2_firmware:4.02.r11.nat.onvifc.20161205:*:*:*:*:*:*:*
xiongmaitech ahb7804r-lms_firmware 4.02.r11.nat.20170301 cpe:2.3:o:xiongmaitech:ahb7804r-lms_firmware:4.02.r11.nat.20170301:*:*:*:*:*:*:*
xiongmaitech hi3518e_50h10l_s39_firmware 4.02.r12.nat.onvifs.20170727 cpe:2.3:o:xiongmaitech:hi3518e_50h10l_s39_firmware:4.02.r12.nat.onvifs.20170727:*:*:*:*:*:*:*

References for CVE-2021-41506

cvelogic Threat Intelligence