CVE-2021-3604: Secure 8 (Evalos) does not validate user input data correctly, allowing a remote attacker to perform a Blind S

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2021-3604 is a critical-severity flaw (CVSS 9.8) affecting secure 8. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Secure 8 (Evalos) does not validate user input data correctly, allowing a remote attacker to perform a Blind SQL Injection. An attacker could exploit this vulnerability in order to extract information of users and administrator accounts stored in the database.

Why this priority

Critical 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	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-89
Published	2021-06-18
Last modified	2026-06-17

Publisher (CNA): Spanish National Cybersecurity Institute, S.A. (INCIBE) · Vendor: primion-digitek

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

Am I affected?

Timeline

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

primion-digitek secure 8 DOWNGRADE

Affected: 1.0.1.55

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.1.55

1. Check installed version

apt-cache policy secure-8 || rpm -q secure-8 || secure-8 --version

2. No fixed release: DOWNGRADE to a release before 1.0.1.55 (Debian / Ubuntu)

apt-cache madison secure-8 sudo apt install secure-8=<VERSION_BEFORE_1.0.1.55> sudo apt-mark hold secure-8

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

dnf --showduplicates list secure-8 sudo dnf downgrade secure-8-<VERSION_BEFORE_1.0.1.55> sudo dnf versionlock add secure-8

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-2021-3604?

secure 8: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-3604 being exploited?

CVE-2021-3604 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-2021-3604 affect?

CVE-2021-3604 affects secure 8. Severity is critical (CVSS 9.8). Secure 8 (Evalos) does not validate user input data correctly, allowing a remote attacker to perform a Blind SQL Injection. An attacker could exploit this vulnerability in order to extract information of users and administrator accounts sto

How urgent is CVE-2021-3604?

Priority 63/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

← Back to latest CVEs