CVE-2021-28271: Soyal Technologies SOYAL 701Server 9.0.1 suffers from an elevation of privileges vulnerability which can be us

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HIGH 8.8UPGRADEUPGRADEUPGRADE

CVE-2021-28271 is a high-severity flaw (CVSS 8.8) affecting 701clientsql, 701server, 701serversql. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Soyal Technologies SOYAL 701Server 9.0.1 suffers from an elevation of privileges vulnerability which can be used by an authenticated user to change the executable file with a binary choice. The vulnerability is due to improper permissions with the 'F' flag (Full) for 'Everyone'and 'Authenticated Users' group.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.9% (top 21%)
CISA exploited list	No
Weakness	CWE-276
Published	2021-04-27
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: soyal

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

Am I affected?

Timeline

2021-04-27 13:15 UTCPublished CVE record published
2026-06-17 03:46 UTCUpdated Record last modified

soyal 701clientsql UPGRADE

Affected: >= 10.0 and < 10.2

Fixed in: 10.2

Safe to downgrade to: a release before 10.0

1. Check installed version

apt-cache policy 701clientsql || rpm -q 701clientsql || 701clientsql --version

2. UPGRADE to 10.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade 701clientsql

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade 701clientsql

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 10.0 (Debian / Ubuntu)

apt-cache madison 701clientsql sudo apt install 701clientsql=<VERSION_BEFORE_10.0> sudo apt-mark hold 701clientsql

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list 701clientsql sudo dnf downgrade 701clientsql-<VERSION_BEFORE_10.0> sudo dnf versionlock add 701clientsql

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.

soyal 701server UPGRADE

Affected: <= 9.0.2

Fixed in: newer than 9.0.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy 701server || rpm -q 701server || 701server --version

2. UPGRADE to newer than 9.0.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade 701server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade 701server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

soyal 701serversql UPGRADE

Affected: >= 10.0 and < 10.2

Fixed in: 10.2

Safe to downgrade to: a release before 10.0

1. Check installed version

apt-cache policy 701serversql || rpm -q 701serversql || 701serversql --version

2. UPGRADE to 10.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade 701serversql

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade 701serversql

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 10.0 (Debian / Ubuntu)

apt-cache madison 701serversql sudo apt install 701serversql=<VERSION_BEFORE_10.0> sudo apt-mark hold 701serversql

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list 701serversql sudo dnf downgrade 701serversql-<VERSION_BEFORE_10.0> sudo dnf versionlock add 701serversql

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-2021-28271?

701clientsql: upgrade to 10.2; 701server: upgrade to newer than 9.0.2; 701serversql: upgrade to 10.2. Exact commands for each OS are on this page.

Is CVE-2021-28271 being exploited?

CVE-2021-28271 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-2021-28271 affect?

CVE-2021-28271 affects 701clientsql, 701server, 701serversql. Severity is high (CVSS 8.8). Soyal Technologies SOYAL 701Server 9.0.1 suffers from an elevation of privileges vulnerability which can be used by an authenticated user to change the executable file with a binary choice. The vulnerability is due to improper permissions w

How urgent is CVE-2021-28271?

Priority 56/100. High severity; Public exploit reference

References

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