CVE-2022-4636: Black Box KVM Firmware version 3.4.31307 on models ACR1000A-R-R2, ACR1000A-T-R2, ACR1002A-T, ACR1002A-R, and A
46
This month
HIGH 7.5REMOTEMITIGATEMITIGATEMITIGATE
CVE-2022-4636 is a high-severity flaw (CVSS 7.5) affecting acr1000a-r-r2 firmware, acr1000a-t-r2 firmware, acr1002a-r firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Black Box KVM Firmware version 3.4.31307 on models ACR1000A-R-R2, ACR1000A-T-R2, ACR1002A-T, ACR1002A-R, and ACR1020A-T is vulnerable to path traversal, which may allow an attacker to steal user credentials and other sensitive information through local file inclusion.
Why this priority
High severity
Remotely exploitable, no login, no user action
No fix is published yet: follow the downgrade or mitigation steps.
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
Published CVE record published
Updated Record last modified
blackbox acr1000a-r-r2 firmware MITIGATE
Affected: 3.4.31307
Fixed in: no fixed release known
Safe to downgrade to: a release before 3.4.31307
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.
blackbox acr1000a-t-r2 firmware MITIGATE
Affected: 3.4.31307
Fixed in: no fixed release known
Safe to downgrade to: a release before 3.4.31307
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.
blackbox acr1002a-r firmware MITIGATE
Affected: 3.4.31307
Fixed in: no fixed release known
Safe to downgrade to: a release before 3.4.31307
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.
blackbox acr1002a-t firmware MITIGATE
Affected: 3.4.31307
Fixed in: no fixed release known
Safe to downgrade to: a release before 3.4.31307
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.
blackbox acr1020a-t firmware MITIGATE
Affected: 3.4.31307
Fixed in: no fixed release known
Safe to downgrade to: a release before 3.4.31307
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.
Verify at the official sourceNVD · 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-2022-4636?
acr1000a-r-r2 firmware: mitigate or apply the listed mitigation; acr1000a-t-r2 firmware: mitigate or apply the listed mitigation; acr1002a-r firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2022-4636 being exploited?
CVE-2022-4636 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-2022-4636 affect?
CVE-2022-4636 affects acr1000a-r-r2 firmware, acr1000a-t-r2 firmware, acr1002a-r firmware. Severity is high (CVSS 7.5). Black Box KVM Firmware version 3.4.31307 on models ACR1000A-R-R2, ACR1000A-T-R2, ACR1002A-T, ACR1002A-R, and ACR1020A-T is vulnerable to path traversal, which may allow an attacker to steal user credentials and other sensitive information t
How urgent is CVE-2022-4636?
Priority 46/100. High severity; Remotely exploitable, no login, no user action
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