CVE-2021-30176: The ZEROF Expert pro/2.0 application for mobile devices allows SQL Injection via the Authorization header to t

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2021-30176 is a critical-severity flaw (CVSS 9.8) affecting expert. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The ZEROF Expert pro/2.0 application for mobile devices allows SQL Injection via the Authorization header to the /v2/devices/add endpoint.

Why this priority

Critical severity
EPSS top 2%: very likely to be exploited
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	29.0% (top 2%)
CISA exploited list	No
Weakness	CWE-89
Published	2021-04-13
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: zerof

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

Am I affected?

Timeline

2021-04-13 14:15 UTCPublished CVE record published
2026-06-17 03:49 UTCUpdated Record last modified

zerof expert DOWNGRADE

Affected: 2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.0 (Debian / Ubuntu)

apt-cache madison expert sudo apt install expert=<VERSION_BEFORE_2.0> sudo apt-mark hold expert

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

dnf --showduplicates list expert sudo dnf downgrade expert-<VERSION_BEFORE_2.0> sudo dnf versionlock add expert

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-2021-30176?

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

Is CVE-2021-30176 being exploited?

CVE-2021-30176 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-2021-30176 affect?

CVE-2021-30176 affects expert. Severity is critical (CVSS 9.8). The ZEROF Expert pro/2.0 application for mobile devices allows SQL Injection via the Authorization header to the /v2/devices/add endpoint.

How urgent is CVE-2021-30176?

Priority 64/100. Critical severity; EPSS top 2%: very likely to be exploited; Remotely exploitable, no login, no user action

References

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