CVE-2005-4155: registration.PHP in ATutor 1.5.1 pl2 allows remote attackers to execute arbitrary SQL commands via an e-mail a

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HIGH 7.5DOWNGRADE

CVE-2005-4155 is a high-severity flaw (CVSS 7.5) affecting atutor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

registration.PHP in ATutor 1.5.1 pl2 allows remote attackers to execute arbitrary SQL commands via an e-mail address that ends in a NULL character, which bypasses the PHP regular expression check. NOTE: it is possible that this is actually a bug in PHP code, in which case this should not be treated as a vulnerability in ATutor.

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	2.7% (top 14%)
CISA exploited list	No
Published	2005-12-11
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: adaptive technology resource centre

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

Am I affected?

Timeline

2005-12-11 02:03 UTCPublished CVE record published
2026-06-16 22:18 UTCUpdated Record last modified

adaptive technology resource centre atutor DOWNGRADE

Affected: 1.5.1_pl2

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.5.1_pl2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.5.1_pl2 (Debian / Ubuntu)

apt-cache madison atutor sudo apt install atutor=<VERSION_BEFORE_1.5.1_pl2> sudo apt-mark hold atutor

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

dnf --showduplicates list atutor sudo dnf downgrade atutor-<VERSION_BEFORE_1.5.1_pl2> sudo dnf versionlock add atutor

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: ATutor 1.5.1pl2 - SQL Injection / Command Execution

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-2005-4155?

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

Is CVE-2005-4155 being exploited?

CVE-2005-4155 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-2005-4155 affect?

CVE-2005-4155 affects atutor. Severity is high (CVSS 7.5). registration.PHP in ATutor 1.5.1 pl2 allows remote attackers to execute arbitrary SQL commands via an e-mail address that ends in a NULL character, which bypasses the PHP regular expression check. NOTE: it is possible that this is actually

How urgent is CVE-2005-4155?

Priority 53/100. High severity; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

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CVE-2020-23341 MEDIUM 6.1 UPGRADE A reflected cross site scripting (XSS) vulnerability in the /header.tmpl.php component of ATutor 2.2.4 allows
CVE-2019-7172 MEDIUM 6.1 UPGRADE A stored-self XSS exists in ATutor through v2.2.4, allowing an attacker to execute HTML or JavaScript code in
CVE-2019-12170 HIGH 8.8 UPGRADE ATutor through 2.2.4 is vulnerable to arbitrary file uploads via the mods/_core/backups/upload.php (aka backup

References

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