CVE-2021-37625: Skytable is an open source NoSQL database

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HIGH 7.5REMOTEDOWNGRADE

CVE-2021-37625 is a high-severity flaw (CVSS 7.5) affecting skytable. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Skytable is an open source NoSQL database. In versions prior to 0.6.4 an incorrect check of return value of the accept function in the run-loop for a TCP socket/TLS socket/TCP+TLS multi-socket causes an early exit from the run loop that should continue infinitely unless terminated by a local user, effectively causing the whole database server to shut down. This has severe impact and can be used to easily cause DoS attacks without the need to use

Why this priority

High severity
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	0.9% (top 39%)
CISA exploited list	No
Weakness	CWE-252, CWE-253
Published	2021-08-05
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: skytable

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

Am I affected?

Timeline

2021-08-05 18:15 UTCPublished CVE record published
2026-06-17 04:00 UTCUpdated Record last modified

skytable skytable DOWNGRADE

Affected: 0.1.0 · 0.2.0 · 0.3.0 · 0.3.1 · 0.3.2 · 0.4.0 · 0.4.1 · 0.4.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.1.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.1.0 (Debian / Ubuntu)

apt-cache madison skytable sudo apt install skytable=<VERSION_BEFORE_0.1.0> sudo apt-mark hold skytable

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

dnf --showduplicates list skytable sudo dnf downgrade skytable-<VERSION_BEFORE_0.1.0> sudo dnf versionlock add skytable

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-2021-37625?

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

Is CVE-2021-37625 being exploited?

CVE-2021-37625 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-2021-37625 affect?

CVE-2021-37625 affects skytable. Severity is high (CVSS 7.5). Skytable is an open source NoSQL database. In versions prior to 0.6.4 an incorrect check of return value of the accept function in the run-loop for a TCP socket/TLS socket/TCP+TLS multi-socket causes an early exit from the run loop that sho

How urgent is CVE-2021-37625?

Priority 46/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-32814 HIGH 8.8 UPGRADE Skytable is a NoSQL database with automated snapshots and TLS

References

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