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CVE-2021-43797: Netty is an asynchronous event-driven network application framework for rapid development of maintainable high

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This month
MEDIUM 6.5UPGRADEUPGRADEMITIGATE

CVE-2021-43797 is a medium-severity flaw (CVSS 6.5) affecting netty, quarkus, oncommand workflow automation. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. Netty prior to version 4.1.71.Final skips control chars when they are present at the beginning / end of the header name. It should instead fail fast as these are not allowed by the spec and could lead to HTTP request smuggling. Failing to do the validation might cause netty to "sanitize" header nam

Why this priority

  • No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score6.5 (Medium)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionRequired
EPSS exploit chance2.9% (top 13%)
CISA exploited listNo
WeaknessCWE-444
Published2021-12-09
Last modified2026-10-08
Publisher (CNA): GitHub, Inc. · Vendor: netapp · netty · oracle · quarkus

Share: LinkedIn · X · Reddit

Last updated 2026-10-08 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

netty netty UPGRADE
Affected: < 4.1.71
Fixed in: 4.1.71
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy netty || rpm -q netty || netty --version
2. UPGRADE to 4.1.71 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade netty
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade netty
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
quarkus quarkus UPGRADE
Affected: < 2.5.3
Fixed in: 2.5.3
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy quarkus || rpm -q quarkus || quarkus --version
2. UPGRADE to 2.5.3 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade quarkus
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade quarkus
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
netapp oncommand workflow automation 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 oncommand-workflow-automation || rpm -q oncommand-workflow-automation || oncommand-workflow-automation --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
netapp snapcenter 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 snapcenter || rpm -q snapcenter || snapcenter --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
oracle banking deposits and lines of credit servicing DOWNGRADE
Affected: 2.7
Fixed in: no fixed release known
Safe to downgrade to: a release before 2.7
1. Check installed version
apt-cache policy banking-deposits-and-lines-of-credit-servicing || rpm -q banking-deposits-and-lines-of-credit-servicing || banking-deposits-and-lines-of-credit-servicing --version
2. No fixed release: DOWNGRADE to a release before 2.7 (Debian / Ubuntu)
apt-cache madison banking-deposits-and-lines-of-credit-servicing sudo apt install banking-deposits-and-lines-of-credit-servicing=<VERSION_BEFORE_2.7> sudo apt-mark hold banking-deposits-and-lines-of-credit-servicing
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list banking-deposits-and-lines-of-credit-servicing sudo dnf downgrade banking-deposits-and-lines-of-credit-servicing-<VERSION_BEFORE_2.7> sudo dnf versionlock add banking-deposits-and-lines-of-credit-servicing
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.
oracle banking party management DOWNGRADE
Affected: 2.7.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 2.7.0
1. Check installed version
apt-cache policy banking-party-management || rpm -q banking-party-management || banking-party-management --version
2. No fixed release: DOWNGRADE to a release before 2.7.0 (Debian / Ubuntu)
apt-cache madison banking-party-management sudo apt install banking-party-management=<VERSION_BEFORE_2.7.0> sudo apt-mark hold banking-party-management
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list banking-party-management sudo dnf downgrade banking-party-management-<VERSION_BEFORE_2.7.0> sudo dnf versionlock add banking-party-management
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-2021-43797?

netty: upgrade to 4.1.71; quarkus: upgrade to 2.5.3; oncommand workflow automation: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-43797 being exploited?

CVE-2021-43797 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-2021-43797 affect?

CVE-2021-43797 affects netty, quarkus, oncommand workflow automation. Severity is medium (CVSS 6.5). Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. Netty prior to version 4.1.71.Final skips control chars when they are present at the begi

How urgent is CVE-2021-43797?

Priority 44/100. No elevated risk signals yet.

Related CVEs

References

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