CVE-2020-36946: SyncBreeze 10.0.28 contains a denial of service vulnerability in the login endpoint that allows remote attacke

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HIGH 7.5REMOTEDOWNGRADE

CVE-2020-36946 is a high-severity flaw (CVSS 7.5) affecting syncbreeze. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SyncBreeze 10.0.28 contains a denial of service vulnerability in the login endpoint that allows remote attackers to crash the service. Attackers can send an oversized payload in the login request to overwhelm the application and potentially disrupt service availability.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 45%)
CISA exploited list	No
Weakness	CWE-770
Published	2026-01-27
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: flexense

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

Am I affected?

Timeline

2026-01-27 16:16 UTCPublished CVE record published
2026-06-17 03:16 UTCUpdated Record last modified

flexense syncbreeze DOWNGRADE

Affected: 10.0.28

Fixed in: no fixed release known

Safe to downgrade to: a release before 10.0.28

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 10.0.28 (Debian / Ubuntu)

apt-cache madison syncbreeze sudo apt install syncbreeze=<VERSION_BEFORE_10.0.28> sudo apt-mark hold syncbreeze

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

dnf --showduplicates list syncbreeze sudo dnf downgrade syncbreeze-<VERSION_BEFORE_10.0.28> sudo dnf versionlock add syncbreeze

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-2020-36946?

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

Is CVE-2020-36946 being exploited?

CVE-2020-36946 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-2020-36946 affect?

CVE-2020-36946 affects syncbreeze. Severity is high (CVSS 7.5). SyncBreeze 10.0.28 contains a denial of service vulnerability in the login endpoint that allows remote attackers to crash the service. Attackers can send an oversized payload in the login request to overwhelm the application and potentially

How urgent is CVE-2020-36946?

Priority 50/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-59900 MEDIUM 5.4 DOWNGRADE DOWNGRADE Sync Breeze Enterprise Server v10.4.18 and Disk Pulse Enterprise v10.4.18 contain a persistent authenticated C
CVE-2025-59899 MEDIUM 5.4 DOWNGRADE DOWNGRADE Sync Breeze Enterprise Server v10.4.18 and Disk Pulse Enterprise v10.4.18 contain a persistent authenticated C
CVE-2025-59898 MEDIUM 5.4 DOWNGRADE DOWNGRADE Sync Breeze Enterprise Server v10.4.18 and Disk Pulse Enterprise v10.4.18 contain a persistent authenticated C
CVE-2025-59897 MEDIUM 5.4 DOWNGRADE DOWNGRADE Sync Breeze Enterprise Server v10.4.18 and Disk Pulse Enterprise v10.4.18 contain a persistent authenticated C
CVE-2025-59896 MEDIUM 5.4 DOWNGRADE DOWNGRADE Sync Breeze Enterprise Server v10.4.18 and Disk Pulse Enterprise v10.4.18 contain a persistent authenticated C

References

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