CVE-2021-23859 | Denial of Service and Authentication Bypass Vulnerability in multiple Bosch products

An unauthenticated attacker is able to send a special HTTP request, that causes a service to crash. In case of a standalone VRM or BVMS with VRM installation this crash also opens the possibility to send further unauthenticated commands to the service. On some products the interface is only local accessible lowering the CVSS base score. For a list of modified CVSS scores, please see the official Bosch Advisory Appendix chapter Modified CVSS Scores for CVE-2021-23859

Published: 2021-12-08 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-23859 is rated Moderate Risk (57.1/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 0.97%). Review affected assets and schedule remediation.

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

Exploit prediction scoring system (EPSS) score for CVE-2021-23859

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 2026-06-15 0.29% 0.97% +0.68%
2 2025-03-30 0.60% 0.29% -0.32%
3 2025-03-29 — 0.60% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-23859

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.1 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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:N)
Doesn’t really leak secrets in a meaningful 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 5.2 [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P 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:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2021-23859

Affected software / configurations for CVE-2021-23859

Vendor Product Version Raw CPE
bosch bosch_video_management_system <= 9.0 cpe:2.3:a:bosch:bosch_video_management_system:*:*:*:*:*:*:*:*
bosch bosch_video_management_system >= 10.0, < 10.0.2 cpe:2.3:a:bosch:bosch_video_management_system:*:*:*:*:*:*:*:*
bosch bosch_video_management_system 10.1 cpe:2.3:a:bosch:bosch_video_management_system:10.1:*:*:*:*:*:*:*
bosch bosch_video_management_system 11.0 cpe:2.3:a:bosch:bosch_video_management_system:11.0:*:*:*:*:*:*:*
bosch video_recording_manager <= 3.81 cpe:2.3:a:bosch:video_recording_manager:*:*:*:*:*:*:*:*
bosch video_recording_manager >= 3.82, <= 3.82.0057 cpe:2.3:a:bosch:video_recording_manager:*:*:*:*:*:*:*:*
bosch video_recording_manager >= 3.83, <= 3.83.0021 cpe:2.3:a:bosch:video_recording_manager:*:*:*:*:*:*:*:*
bosch video_recording_manager >= 4.0, <= 4.00.0070 cpe:2.3:a:bosch:video_recording_manager:*:*:*:*:*:*:*:*
bosch access_easy_controller_firmware <= 2.9.1.0 cpe:2.3:o:bosch:access_easy_controller_firmware:*:*:*:*:*:*:*:*
bosch access_professional_edition <= 3.8.0 cpe:2.3:a:bosch:access_professional_edition:*:*:*:*:*:*:*:*
bosch building_integration_system <= 4.9 cpe:2.3:a:bosch:building_integration_system:*:*:*:*:*:*:*:*
bosch video_recording_manager_exporter >= 2.1, <= 2.10.0008 cpe:2.3:a:bosch:video_recording_manager_exporter:*:*:*:*:*:*:*:*

References for CVE-2021-23859

cvelogic Threat Intelligence