PatchTheCVECVE-2021-3642: A flaw was found in Wildfly Elytron in versions prior to 1.10.14.Final, prior to 1.15.5.Final and prior to 1.1
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Routine
MEDIUM 5.3WATCHLISTUPGRADEMITIGATEDOWNGRADE
CVE-2021-3642 is a medium-severity flaw (CVSS 5.3) affecting wildfly elytron, build of quarkus, codeready studio. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
A flaw was found in Wildfly Elytron in versions prior to 1.10.14.Final, prior to 1.15.5.Final and prior to 1.16.1.Final where ScramServer may be susceptible to Timing Attack if enabled. The highest threat of this vulnerability is confidentiality.
Why this priority
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.3 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 0.8% (top 42%) |
| CISA exploited list | No |
| Weakness | CWE-203 |
| Published | 2021-08-05 |
| Last modified | 2026-06-17 |
Publisher (CNA): Red Hat, Inc. · Vendor: redhat
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
redhat wildfly elytron UPGRADE
Affected: < 1.10.14 · >= 1.11.0 and < 1.15.5 · >= 1.16.0 and < 1.16.1
Fixed in: 1.10.14, 1.15.5, 1.16.1
Safe to downgrade to: a release before 1.11.0
1. Check installed version
apt-cache policy wildfly-elytron || rpm -q wildfly-elytron || wildfly-elytron --version
2. UPGRADE to 1.10.14 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade wildfly-elytron
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade wildfly-elytron
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 1.11.0 (Debian / Ubuntu)
apt-cache madison wildfly-elytron
sudo apt install wildfly-elytron=<VERSION_BEFORE_1.11.0>
sudo apt-mark hold wildfly-elytron
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list wildfly-elytron
sudo dnf downgrade wildfly-elytron-<VERSION_BEFORE_1.11.0>
sudo dnf versionlock add wildfly-elytron
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.
redhat build of quarkus MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy build-of-quarkus || rpm -q build-of-quarkus || build-of-quarkus --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
redhat codeready studio DOWNGRADE
Affected: 12.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 12.0
1. Check installed version
apt-cache policy codeready-studio || rpm -q codeready-studio || codeready-studio --version
2. No fixed release: DOWNGRADE to a release before 12.0 (Debian / Ubuntu)
apt-cache madison codeready-studio
sudo apt install codeready-studio=<VERSION_BEFORE_12.0>
sudo apt-mark hold codeready-studio
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list codeready-studio
sudo dnf downgrade codeready-studio-<VERSION_BEFORE_12.0>
sudo dnf versionlock add codeready-studio
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.
redhat data grid DOWNGRADE
Affected: 8.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 8.0
1. Check installed version
apt-cache policy data-grid || rpm -q data-grid || data-grid --version
2. No fixed release: DOWNGRADE to a release before 8.0 (Debian / Ubuntu)
apt-cache madison data-grid
sudo apt install data-grid=<VERSION_BEFORE_8.0>
sudo apt-mark hold data-grid
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list data-grid
sudo dnf downgrade data-grid-<VERSION_BEFORE_8.0>
sudo dnf versionlock add data-grid
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.
redhat descision manager DOWNGRADE
Affected: 7.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 7.0
1. Check installed version
apt-cache policy descision-manager || rpm -q descision-manager || descision-manager --version
2. No fixed release: DOWNGRADE to a release before 7.0 (Debian / Ubuntu)
apt-cache madison descision-manager
sudo apt install descision-manager=<VERSION_BEFORE_7.0>
sudo apt-mark hold descision-manager
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list descision-manager
sudo dnf downgrade descision-manager-<VERSION_BEFORE_7.0>
sudo dnf versionlock add descision-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.
redhat integration camel k MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy integration-camel-k || rpm -q integration-camel-k || integration-camel-k --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
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-2021-3642?
wildfly elytron: upgrade to 1.10.14, 1.15.5, 1.16.1; build of quarkus: mitigate or apply the listed mitigation; codeready studio: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2021-3642 being exploited?
CVE-2021-3642 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-2021-3642 affect?
CVE-2021-3642 affects wildfly elytron, build of quarkus, codeready studio. Severity is medium (CVSS 5.3). A flaw was found in Wildfly Elytron in versions prior to 1.10.14.Final, prior to 1.15.5.Final and prior to 1.16.1.Final where ScramServer may be susceptible to Timing Attack if enabled. The highest threat of this vulnerability is confidenti
How urgent is CVE-2021-3642?
Priority 38/100. On your watchlist
Software pages
JBoss and WildFly vulnerabilities
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