Is CVE-2021-47966 actively exploited?

No active exploitation of CVE-2021-47966 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-47966 be exploited remotely?

Yes. CVE-2021-47966 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-47966?

CVE-2021-47966 has a CVSS score of 8.2 (HIGH).

HOME VULNERABILITIESCVE-2021-47966

HIGH

CVE-2021-47966

CWE-89Published: May 15, 2026· Updated: May 18, 2026

8.2

CVSS v3.1

EPSS:0.07%probability of exploitation in 30 daysPercentile:20.9th

Official Description

PHP Timeclock 1.04 contains time-based and boolean-based blind SQL injection vulnerabilities in the login_userid parameter of login.php that allows unauthenticated attackers to extract database contents. Attackers can submit crafted POST requests with SQL payloads using SLEEP functions or RLIKE conditional statements to dump sensitive database information including employee names and credentials.

NVD Source

Technical Analysis

CVE-2021-47966 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 8.2.

From a weakness classification perspective (CWE-89): SQL injection vulnerabilities allow attackers to manipulate database queries, potentially exposing or modifying sensitive data.