CVE-2021-23859: An unauthenticated attacker is able to send a special HTTP request, that causes a service to crash

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CRITICAL 9.1REMOTEUPGRADEUPGRADEUPGRADE

CVE-2021-23859 is a critical-severity flaw (CVSS 9.1) affecting bosch video management system, video recording manager, access easy controller firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 Score

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 37%)
CISA exploited list	No
Weakness	CWE-703, CWE-755
Published	2021-12-08
Last modified	2026-06-17

Publisher (CNA): Robert Bosch GmbH · Vendor: bosch

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-12-08 22:15 UTCPublished CVE record published
2026-06-17 03:38 UTCUpdated Record last modified

bosch bosch video management system UPGRADE

Affected: <= 9.0 · >= 10.0 and < 10.0.2 · 10.1 · 11.0

Fixed in: 10.0.2

Safe to downgrade to: a release before 10.0

1. Check installed version

apt-cache policy bosch-video-management-system || rpm -q bosch-video-management-system || bosch-video-management-system --version

2. UPGRADE to 10.0.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade bosch-video-management-system

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade bosch-video-management-system

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 10.0 (Debian / Ubuntu)

apt-cache madison bosch-video-management-system sudo apt install bosch-video-management-system=<VERSION_BEFORE_10.0> sudo apt-mark hold bosch-video-management-system

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list bosch-video-management-system sudo dnf downgrade bosch-video-management-system-<VERSION_BEFORE_10.0> sudo dnf versionlock add bosch-video-management-system

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

bosch video recording manager UPGRADE

Affected: <= 3.81 · >= 3.82 and <= 3.82.0057 · >= 3.83 and <= 3.83.0021 · >= 4.0 and <= 4.00.0070

Fixed in: newer than 4.00.0070

Safe to downgrade to: a release before 3.82

1. Check installed version

apt-cache policy video-recording-manager || rpm -q video-recording-manager || video-recording-manager --version

2. UPGRADE to newer than 4.00.0070 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade video-recording-manager

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade video-recording-manager

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 3.82 (Debian / Ubuntu)

apt-cache madison video-recording-manager sudo apt install video-recording-manager=<VERSION_BEFORE_3.82> sudo apt-mark hold video-recording-manager

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list video-recording-manager sudo dnf downgrade video-recording-manager-<VERSION_BEFORE_3.82> sudo dnf versionlock add video-recording-manager

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

bosch access easy controller firmware UPGRADE

Affected: <= 2.9.1.0

Fixed in: newer than 2.9.1.0

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

bosch access professional edition UPGRADE

Affected: <= 3.8.0

Fixed in: newer than 3.8.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy access-professional-edition || rpm -q access-professional-edition || access-professional-edition --version

2. UPGRADE to newer than 3.8.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade access-professional-edition

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade access-professional-edition

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

bosch building integration system UPGRADE

Affected: <= 4.9

Fixed in: newer than 4.9

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy building-integration-system || rpm -q building-integration-system || building-integration-system --version

2. UPGRADE to newer than 4.9 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade building-integration-system

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade building-integration-system

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

bosch video recording manager exporter UPGRADE

Affected: >= 2.1 and <= 2.10.0008

Fixed in: newer than 2.10.0008

Safe to downgrade to: a release before 2.1

1. Check installed version

apt-cache policy video-recording-manager-exporter || rpm -q video-recording-manager-exporter || video-recording-manager-exporter --version

2. UPGRADE to newer than 2.10.0008 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade video-recording-manager-exporter

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade video-recording-manager-exporter

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.1 (Debian / Ubuntu)

apt-cache madison video-recording-manager-exporter sudo apt install video-recording-manager-exporter=<VERSION_BEFORE_2.1> sudo apt-mark hold video-recording-manager-exporter

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list video-recording-manager-exporter sudo dnf downgrade video-recording-manager-exporter-<VERSION_BEFORE_2.1> sudo dnf versionlock add video-recording-manager-exporter

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-23859?

bosch video management system: upgrade to 10.0.2; video recording manager: upgrade to newer than 4.00.0070; access easy controller firmware: upgrade to newer than 2.9.1.0. Exact commands for each OS are on this page.

Is CVE-2021-23859 being exploited?

CVE-2021-23859 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-23859 affect?

CVE-2021-23859 affects bosch video management system, video recording manager, access easy controller firmware. Severity is critical (CVSS 9.1). 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

How urgent is CVE-2021-23859?

Priority 53/100. Critical severity; Remotely exploitable, no login, no user action

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References

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