CVE-2020-27822: A flaw was found in Wildfly affecting versions 19.0.0.Final, 19.1.0.Final, 20.0.0.Final, 20.0.1.Final, and 21.

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MEDIUM 5.9REMOTEWATCHLISTDOWNGRADE

CVE-2020-27822 is a medium-severity flaw (CVSS 5.9) affecting wildfly. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw was found in Wildfly affecting versions 19.0.0.Final, 19.1.0.Final, 20.0.0.Final, 20.0.1.Final, and 21.0.0.Final. When an application uses the OpenTracing API's java-interceptors, there is a possibility of a memory leak. This flaw allows an attacker to impact the availability of the server. The highest threat from this vulnerability is to system availability.

Why this priority

Remotely exploitable, no login, no user action
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-401
Published	2020-12-08
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

2020-12-08 01:15 UTCPublished CVE record published
2026-06-17 03:09 UTCUpdated Record last modified

redhat wildfly DOWNGRADE

Affected: 19.0.0 · 19.1.0 · 20.0.0 · 20.0.1 · 21.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 19.0.0

1. Check installed version

apt-cache policy wildfly || rpm -q wildfly || wildfly --version

2. No fixed release: DOWNGRADE to a release before 19.0.0 (Debian / Ubuntu)

apt-cache madison wildfly sudo apt install wildfly=<VERSION_BEFORE_19.0.0> sudo apt-mark hold wildfly

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list wildfly sudo dnf downgrade wildfly-<VERSION_BEFORE_19.0.0> sudo dnf versionlock add wildfly

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.

Quick answers

How do I fix CVE-2020-27822?

wildfly: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-27822 being exploited?

CVE-2020-27822 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-2020-27822 affect?

CVE-2020-27822 affects wildfly. Severity is medium (CVSS 5.9). A flaw was found in Wildfly affecting versions 19.0.0.Final, 19.1.0.Final, 20.0.0.Final, 20.0.1.Final, and 21.0.0.Final. When an application uses the OpenTracing API's java-interceptors, there is a possibility of a memory leak. This flaw al

How urgent is CVE-2020-27822?

Priority 47/100. Remotely exploitable, no login, no user action; On your watchlist

Software pages

Java vulnerabilities · JBoss and WildFly vulnerabilities

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CVE-2021-3644 LOW 3.3 DOWNGRADE DOWNGRADE A flaw was found in wildfly-core in all versions
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References

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