PatchTheCVECVE-2019-15631: Remote Code Execution vulnerability in MuleSoft Mule CE/EE 3.x and API Gateway 2.x released before October 31,
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CRITICAL 9.8REMOTEUPGRADEUPGRADEUPGRADE
CVE-2019-15631 is a critical-severity flaw (CVSS 9.8) affecting api gateway, mule runtime, mule runtime. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Remote Code Execution vulnerability in MuleSoft Mule CE/EE 3.x and API Gateway 2.x released before October 31, 2019 allows remote attackers to execute arbitrary code.
Why this priority
- Critical severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 2.3% (top 16%) |
| CISA exploited list | No |
| Published | 2019-12-02 |
| Last modified | 2026-06-17 |
Publisher (CNA): Salesforce, Inc. · Vendor: mulesoft
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
mulesoft api gateway UPGRADE
Affected: >= 2.0.0 and <= 2.2.12
Fixed in: newer than 2.2.12
Safe to downgrade to: a release before 2.0.0
1. Check installed version
apt-cache policy api-gateway || rpm -q api-gateway || api-gateway --version
2. UPGRADE to newer than 2.2.12 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade api-gateway
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade api-gateway
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 2.0.0 (Debian / Ubuntu)
apt-cache madison api-gateway
sudo apt install api-gateway=<VERSION_BEFORE_2.0.0>
sudo apt-mark hold api-gateway
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list api-gateway
sudo dnf downgrade api-gateway-<VERSION_BEFORE_2.0.0>
sudo dnf versionlock add api-gateway
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.
mulesoft mule runtime UPGRADE
Affected: >= 3.0.0 and <= 3.9.3
Fixed in: newer than 3.9.3
Safe to downgrade to: a release before 3.0.0
1. Check installed version
apt-cache policy mule-runtime || rpm -q mule-runtime || mule-runtime --version
2. UPGRADE to newer than 3.9.3 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade mule-runtime
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade mule-runtime
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 3.0.0 (Debian / Ubuntu)
apt-cache madison mule-runtime
sudo apt install mule-runtime=<VERSION_BEFORE_3.0.0>
sudo apt-mark hold mule-runtime
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list mule-runtime
sudo dnf downgrade mule-runtime-<VERSION_BEFORE_3.0.0>
sudo dnf versionlock add mule-runtime
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.
mulesoft mule runtime UPGRADE
Affected: >= 3.0.0 and <= 3.9.3
Fixed in: newer than 3.9.3
Safe to downgrade to: a release before 3.0.0
1. Check installed version
apt-cache policy mule-runtime || rpm -q mule-runtime || mule-runtime --version
2. UPGRADE to newer than 3.9.3 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade mule-runtime
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade mule-runtime
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 3.0.0 (Debian / Ubuntu)
apt-cache madison mule-runtime
sudo apt install mule-runtime=<VERSION_BEFORE_3.0.0>
sudo apt-mark hold mule-runtime
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list mule-runtime
sudo dnf downgrade mule-runtime-<VERSION_BEFORE_3.0.0>
sudo dnf versionlock add mule-runtime
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.
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-2019-15631?
api gateway: upgrade to newer than 2.2.12; mule runtime: upgrade to newer than 3.9.3; mule runtime: upgrade to newer than 3.9.3. Exact commands for each OS are on this page.
Is CVE-2019-15631 being exploited?
CVE-2019-15631 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-2019-15631 affect?
CVE-2019-15631 affects api gateway, mule runtime, mule runtime. Severity is critical (CVSS 9.8). Remote Code Execution vulnerability in MuleSoft Mule CE/EE 3.x and API Gateway 2.x released before October 31, 2019 allows remote attackers to execute arbitrary code.
How urgent is CVE-2019-15631?
Priority 60/100. Critical severity; Remotely exploitable, no login, no user action
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