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CVE-2019-19631: An issue was discovered in Big Switch Big Monitoring Fabric 6.2 through 6.2.4, 6.3 through 6.3.9, 7.0 through

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This month
HIGH 8.8UPGRADEUPGRADEUPGRADE

CVE-2019-19631 is a high-severity flaw (CVSS 8.8) affecting big cloud fabric, big monitoring fabric, multi-cloud director. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in Big Switch Big Monitoring Fabric 6.2 through 6.2.4, 6.3 through 6.3.9, 7.0 through 7.0.3, and 7.1 through 7.1.3; Big Cloud Fabric 4.5 through 4.5.5, 4.7 through 4.7.7, 5.0 through 5.0.1, and 5.1 through 5.1.4; and Multi-Cloud Director through 1.1.0. A read-only user can access sensitive information via an API endpoint that reveals session cookies of authenticated administrators, leading to privilege escalation.

Why this priority

  • High severity
  • Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score8.8 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededLow
User interactionNone
EPSS exploit chance1.7% (top 22%)
CISA exploited listNo
WeaknessCWE-200
Published2020-01-24
Last modified2026-06-17
Publisher (CNA): MITRE · Vendor: bigswitch

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

Am I affected?

Timeline

bigswitch big cloud fabric UPGRADE
Affected: >= 4.5 and < 4.5.5 · >= 4.7 and < 4.7.7 · >= 5.0 and < 5.0.1 · >= 5.1 and < 5.1.4
Fixed in: 4.5.5, 4.7.7, 5.0.1, 5.1.4
Safe to downgrade to: a release before 4.5
1. Check installed version
apt-cache policy big-cloud-fabric || rpm -q big-cloud-fabric || big-cloud-fabric --version
2. UPGRADE to 4.5.5 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade big-cloud-fabric
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade big-cloud-fabric
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 4.5 (Debian / Ubuntu)
apt-cache madison big-cloud-fabric sudo apt install big-cloud-fabric=<VERSION_BEFORE_4.5> sudo apt-mark hold big-cloud-fabric
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list big-cloud-fabric sudo dnf downgrade big-cloud-fabric-<VERSION_BEFORE_4.5> sudo dnf versionlock add big-cloud-fabric
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.
bigswitch big monitoring fabric UPGRADE
Affected: >= 6.2 and < 6.2.4 · >= 6.3 and < 6.3.9 · >= 7.0 and < 7.0.3 · >= 7.1 and < 7.1.4
Fixed in: 6.2.4, 6.3.9, 7.0.3, 7.1.4
Safe to downgrade to: a release before 6.2
1. Check installed version
apt-cache policy big-monitoring-fabric || rpm -q big-monitoring-fabric || big-monitoring-fabric --version
2. UPGRADE to 6.2.4 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade big-monitoring-fabric
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade big-monitoring-fabric
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 6.2 (Debian / Ubuntu)
apt-cache madison big-monitoring-fabric sudo apt install big-monitoring-fabric=<VERSION_BEFORE_6.2> sudo apt-mark hold big-monitoring-fabric
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list big-monitoring-fabric sudo dnf downgrade big-monitoring-fabric-<VERSION_BEFORE_6.2> sudo dnf versionlock add big-monitoring-fabric
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.
bigswitch multi-cloud director UPGRADE
Affected: < 1.1.0
Fixed in: 1.1.0
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy multi-cloud-director || rpm -q multi-cloud-director || multi-cloud-director --version
2. UPGRADE to 1.1.0 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade multi-cloud-director
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade multi-cloud-director
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
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-2019-19631?

big cloud fabric: upgrade to 4.5.5, 4.7.7, 5.0.1, 5.1.4; big monitoring fabric: upgrade to 6.2.4, 6.3.9, 7.0.3, 7.1.4; multi-cloud director: upgrade to 1.1.0. Exact commands for each OS are on this page.

Is CVE-2019-19631 being exploited?

CVE-2019-19631 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-2019-19631 affect?

CVE-2019-19631 affects big cloud fabric, big monitoring fabric, multi-cloud director. Severity is high (CVSS 8.8). An issue was discovered in Big Switch Big Monitoring Fabric 6.2 through 6.2.4, 6.3 through 6.3.9, 7.0 through 7.0.3, and 7.1 through 7.1.3; Big Cloud Fabric 4.5 through 4.5.5, 4.7 through 4.7.7, 5.0 through 5.0.1, and 5.1 through 5.1.4; and

How urgent is CVE-2019-19631?

Priority 55/100. High severity; Public exploit reference

Related CVEs

References

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