CVE-2021-30177: There is a SQL Injection vulnerability in PHP-Nuke 8.3.3 in the User Registration section, leading to remote c

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2021-30177 is a critical-severity flaw (CVSS 9.8) affecting php-nuke. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

There is a SQL Injection vulnerability in PHP-Nuke 8.3.3 in the User Registration section, leading to remote code execution. This occurs because the U.S. state is not validated to be two letters, and the OrderBy field is not validated to be one of LASTNAME, CITY, or STATE.

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	2.4% (top 16%)
CISA exploited list	No
Weakness	CWE-89
Published	2021-04-07
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: phpnuke

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

Am I affected?

Timeline

2021-04-07 11:15 UTCPublished CVE record published
2026-06-17 03:49 UTCUpdated Record last modified

phpnuke php-nuke DOWNGRADE

Affected: 8.3.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.3.3

1. Check installed version

apt-cache policy php-nuke || rpm -q php-nuke || php-nuke --version

2. No fixed release: DOWNGRADE to a release before 8.3.3 (Debian / Ubuntu)

apt-cache madison php-nuke sudo apt install php-nuke=<VERSION_BEFORE_8.3.3> sudo apt-mark hold php-nuke

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

dnf --showduplicates list php-nuke sudo dnf downgrade php-nuke-<VERSION_BEFORE_8.3.3> sudo dnf versionlock add php-nuke

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-2021-30177?

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

Is CVE-2021-30177 being exploited?

CVE-2021-30177 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-2021-30177 affect?

CVE-2021-30177 affects php-nuke. Severity is critical (CVSS 9.8). There is a SQL Injection vulnerability in PHP-Nuke 8.3.3 in the User Registration section, leading to remote code execution. This occurs because the U.S. state is not validated to be two letters, and the OrderBy field is not validated to be

How urgent is CVE-2021-30177?

Priority 65/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2014-3934 HIGH 7.5 DOWNGRADE MITIGATE SQL injection vulnerability in the Submit_News module for PHP-Nuke 8.3 allows remote attackers to execute arbi

References

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