CVE-2004-1961: blocker.php in Protector System 1.15b1 allows remote attackers to bypass SQL injection protection and execute

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HIGH 7.5DOWNGRADE

CVE-2004-1961 is a high-severity flaw (CVSS 7.5) affecting protector system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

blocker.php in Protector System 1.15b1 allows remote attackers to bypass SQL injection protection and execute limited SQL commands via URL-encoded "'" characters ("%27").

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Published	2004-04-23
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: protector system

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2004-04-23 04:00 UTCPublished CVE record published
2026-06-16 22:08 UTCUpdated Record last modified

protector system protector system DOWNGRADE

Affected: 1.15b1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.15b1

1. Check installed version

apt-cache policy protector-system || rpm -q protector-system || protector-system --version

2. No fixed release: DOWNGRADE to a release before 1.15b1 (Debian / Ubuntu)

apt-cache madison protector-system sudo apt install protector-system=<VERSION_BEFORE_1.15b1> sudo apt-mark hold protector-system

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

dnf --showduplicates list protector-system sudo dnf downgrade protector-system-<VERSION_BEFORE_1.15b1> sudo dnf versionlock add protector-system

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-2004-1961?

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

Is CVE-2004-1961 being exploited?

CVE-2004-1961 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-2004-1961 affect?

CVE-2004-1961 affects protector system. Severity is high (CVSS 7.5). blocker.php in Protector System 1.15b1 allows remote attackers to bypass SQL injection protection and execute limited SQL commands via URL-encoded "'" characters ("%27").

How urgent is CVE-2004-1961?

Priority 49/100. High severity; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2004-1962 HIGH 7.5 DOWNGRADE SQL injection vulnerability in index.php in Protector System 1.15b1 allows remote attackers to bypass SQL inje
CVE-2004-1960 MEDIUM 4.3 DOWNGRADE Cross-site scripting (XSS) vulnerability in blocker_query.php in Protector System 1.15b1 allows remote attacke
CVE-2004-1959 MEDIUM 5.0 DOWNGRADE blocker_query.php in Protector System 1.15b1 for PHP-Nuke allows remote attackers to gain sensitive informatio

References

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