CVE-2021-26616: An OS command injection was found in SecuwaySSL, when special characters injection on execute command with run

This month

HIGH 7.8UPGRADE

CVE-2021-26616 is a high-severity flaw (CVSS 7.8) affecting secuwayssl u. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An OS command injection was found in SecuwaySSL, when special characters injection on execute command with runCommand arguments.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-78
Published	2022-02-09
Last modified	2026-06-17

Publisher (CNA): KrCERT/CC · Vendor: secuwiz

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

Am I affected?

Timeline

2022-02-09 23:15 UTCPublished CVE record published
2026-06-17 03:43 UTCUpdated Record last modified

secuwiz secuwayssl u UPGRADE

Affected: >= 2.0.0.4 and <= 2.0.0.8

Fixed in: newer than 2.0.0.8

Safe to downgrade to: a release before 2.0.0.4

1. Check installed version

apt-cache policy secuwayssl-u || rpm -q secuwayssl-u || secuwayssl-u --version

2. UPGRADE to newer than 2.0.0.8 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade secuwayssl-u

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade secuwayssl-u

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 2.0.0.4 (Debian / Ubuntu)

apt-cache madison secuwayssl-u sudo apt install secuwayssl-u=<VERSION_BEFORE_2.0.0.4> sudo apt-mark hold secuwayssl-u

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

dnf --showduplicates list secuwayssl-u sudo dnf downgrade secuwayssl-u-<VERSION_BEFORE_2.0.0.4> sudo dnf versionlock add secuwayssl-u

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-2021-26616?

secuwayssl u: upgrade to newer than 2.0.0.8. Exact commands for each OS are on this page.

Is CVE-2021-26616 being exploited?

CVE-2021-26616 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-2021-26616 affect?

CVE-2021-26616 affects secuwayssl u. Severity is high (CVSS 7.8). An OS command injection was found in SecuwaySSL, when special characters injection on execute command with runCommand arguments.

How urgent is CVE-2021-26616?

Priority 42/100. High severity

References

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