CVE-2020-8963 is a critical-severity flaw (CVSS 9.8) affecting sr9850 firmware, sr9750 firmware, sc9705 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
TimeTools SC7105 1.0.007, SC9205 1.0.007, SC9705 1.0.007, SR7110 1.0.007, SR9210 1.0.007, SR9750 1.0.007, SR9850 1.0.007, T100 1.0.003, T300 1.0.003, and T550 1.0.003 devices allow remote attackers to execute arbitrary OS commands via shell metacharacters in the t3.cgi srmodel or srtime parameter.
Why this priority
Critical severity
Public exploit reference
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
timetoolsltd sr9850 firmware MITIGATE
Affected: 1.0.007
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.0.007
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.
timetoolsltd sr9750 firmware MITIGATE
Affected: 1.0.007
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.0.007
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.
timetoolsltd sc9705 firmware MITIGATE
Affected: 1.0.007
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.0.007
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.
timetoolsltd sr9210 firmware MITIGATE
Affected: 1.0.007
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.0.007
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.
timetoolsltd sc9205 firmware MITIGATE
Affected: 1.0.007
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.0.007
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.
timetoolsltd sr7110 firmware MITIGATE
Affected: 1.0.007
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.0.007
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-2020-8963?
sr9850 firmware: mitigate or apply the listed mitigation; sr9750 firmware: mitigate or apply the listed mitigation; sc9705 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2020-8963 being exploited?
CVE-2020-8963 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-2020-8963 affect?
CVE-2020-8963 affects sr9850 firmware, sr9750 firmware, sc9705 firmware. Severity is critical (CVSS 9.8). TimeTools SC7105 1.0.007, SC9205 1.0.007, SC9705 1.0.007, SR7110 1.0.007, SR9210 1.0.007, SR9750 1.0.007, SR9850 1.0.007, T100 1.0.003, T300 1.0.003, and T550 1.0.003 devices allow remote attackers to execute arbitrary OS commands via shell
How urgent is CVE-2020-8963?
Priority 66/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action
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