CVE-2020-35216: An issue in Atomix v3.1.5 allows attackers to cause a denial of service (DoS) via false member down event mess

Routine

MEDIUM 5.9REMOTEDOWNGRADE

CVE-2020-35216 is a medium-severity flaw (CVSS 5.9) affecting atomix. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue in Atomix v3.1.5 allows attackers to cause a denial of service (DoS) via false member down event messages.

Why this priority

Remotely exploitable, no login, no user action

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	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-362
Published	2021-12-16
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: atomix

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

Am I affected?

Timeline

2021-12-16 20:15 UTCPublished CVE record published
2026-06-17 03:13 UTCUpdated Record last modified

atomix atomix DOWNGRADE

Affected: 3.1.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.1.5

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.1.5 (Debian / Ubuntu)

apt-cache madison atomix sudo apt install atomix=<VERSION_BEFORE_3.1.5> sudo apt-mark hold atomix

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

dnf --showduplicates list atomix sudo dnf downgrade atomix-<VERSION_BEFORE_3.1.5> sudo dnf versionlock add atomix

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-2020-35216?

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

Is CVE-2020-35216 being exploited?

CVE-2020-35216 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-2020-35216 affect?

CVE-2020-35216 affects atomix. Severity is medium (CVSS 5.9). An issue in Atomix v3.1.5 allows attackers to cause a denial of service (DoS) via false member down event messages.

How urgent is CVE-2020-35216?

Priority 39/100. Remotely exploitable, no login, no user action

Related CVEs

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CVE-2020-35214 HIGH 8.1 DOWNGRADE An issue in Atomix v3.1.5 allows a malicious Atomix node to remove states of ONOS storage via abuse of primiti
CVE-2020-35213 HIGH 8.1 DOWNGRADE An issue in Atomix v3.1.5 allows attackers to cause a denial of service (DoS) via false link event messages se
CVE-2020-35211 HIGH 7.5 DOWNGRADE An issue in Atomix v3.1.5 allows unauthorized Atomix nodes to become the lead node in a target cluster via man
CVE-2020-35210 MEDIUM 6.5 UPGRADE A vulnerability in Atomix v3.1.5 allows attackers to cause a denial of service (DoS) via a Raft session floodi

References

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