CVE-2015-20121
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SQL Injection in RealtyScript 4.0.2 Enables Data Theft

Publication date: 2026-03-16

Last updated on: 2026-03-18

Assigner: VulnCheck

Description
Next Click Ventures RealtyScript 4.0.2 contains SQL injection vulnerabilities that allow unauthenticated attackers to manipulate database queries by injecting arbitrary SQL code through the GET parameter 'u_id' in /admin/users.php and the POST parameter 'agent[]' in /admin/mailer.php. Attackers can exploit time-based blind SQL injection techniques to extract sensitive database information or cause denial of service through sleep-based payloads.
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Meta Information
Published
2026-03-16
Last Modified
2026-03-18
Generated
2026-06-16
AI Q&A
2026-03-16
EPSS Evaluated
2026-06-14
NVD
CVE-2015-20121
EUVD
EUVD-2015-9423
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
nextclickventures realtyscript 4.0.2
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-89 The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. Without sufficient removal or quoting of SQL syntax in user-controllable inputs, the generated SQL query can cause those inputs to be interpreted as SQL instead of ordinary user data.
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Executive Summary

[{'type': 'paragraph', 'content': 'CVE-2015-20121 affects RealtyScript version 4.0.2 and involves SQL injection vulnerabilities in two parameters: the GET parameter "u_id" in the file /admin/users.php and the POST parameter "agent[]" in /admin/mailer.php.'}, {'type': 'paragraph', 'content': 'These vulnerabilities allow unauthenticated attackers to inject arbitrary SQL code, enabling manipulation of database queries.'}, {'type': 'paragraph', 'content': 'Exploitation can be performed using time-based blind SQL injection techniques, which can be used to extract sensitive information from the database or cause denial of service by leveraging sleep-based payloads.'}] [1]

Impact Analysis

This vulnerability can allow unauthenticated attackers to manipulate database queries by injecting arbitrary SQL code.

Attackers can exploit this to extract sensitive information from the database, potentially exposing confidential data.

Additionally, attackers can cause denial of service by using sleep-based payloads, which can disrupt the availability of the affected application.

Compliance Impact

I don't know

Detection Guidance

[{'type': 'paragraph', 'content': "The vulnerability involves SQL injection through the GET parameter 'u_id' in /admin/users.php and the POST parameter 'agent[]' in /admin/mailer.php. Detection can be performed by testing these parameters for SQL injection using time-based blind SQL injection techniques."}, {'type': 'paragraph', 'content': 'For example, you can use curl commands to send payloads that cause delays if the injection is successful, such as adding sleep-based payloads to the parameters and measuring response times.'}, {'type': 'list_item', 'content': 'Test GET parameter \'u_id\' with a payload like: curl -i "http://target/admin/users.php?u_id=1\' AND IF(SLEEP(5),1,0)-- "'}, {'type': 'list_item', 'content': 'Test POST parameter \'agent[]\' with a payload like: curl -i -X POST -d "agent[]=1\' AND IF(SLEEP(5),1,0)-- " http://target/admin/mailer.php'}, {'type': 'paragraph', 'content': 'If the response is delayed by the sleep time, it indicates the presence of a time-based blind SQL injection vulnerability.'}] [1]

Mitigation Strategies

[{'type': 'paragraph', 'content': 'Immediate mitigation steps include restricting access to the vulnerable endpoints (/admin/users.php and /admin/mailer.php) to trusted users only, such as by implementing IP whitelisting or authentication.'}, {'type': 'paragraph', 'content': "Additionally, input validation and sanitization should be applied to the 'u_id' GET parameter and the 'agent[]' POST parameter to prevent injection of arbitrary SQL code."}, {'type': 'paragraph', 'content': 'If possible, update or patch RealtyScript to a version that addresses these SQL injection vulnerabilities.'}] [1]

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