CVE-2019-25340 in Nsauditor SpotAuditor
Summary
by MITRE • 02/13/2026
SpotAuditor 5.3.2 contains a denial of service vulnerability in its Base64 decryption feature that allows attackers to crash the application by supplying an oversized buffer. Attackers can generate a malformed input file with 2000 repeated characters to trigger an application crash when pasted into the Base64 Encrypted Password field.
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Analysis
by VulDB Data Team • 02/21/2026
CVE-2019-25340 represents a denial of service vulnerability within SpotAuditor version 5.3.2 that stems from improper handling of Base64 decryption operations. This flaw exists in the application's input validation mechanisms and demonstrates a classic buffer overflow condition that occurs when the software attempts to process excessively large Base64 encoded strings. The vulnerability manifests when an attacker provides a malformed input file containing 2000 repeated characters, which when pasted into the Base64 Encrypted Password field triggers an application crash. This issue falls under the CWE-129 weakness category, specifically addressing improper input validation and inadequate buffer management in cryptographic operations. The vulnerability operates at the application layer and represents a direct threat to system availability, as it allows remote attackers to disrupt service operations without requiring authentication or elevated privileges.
The technical exploitation of this vulnerability occurs through a straightforward method involving the creation of a specially crafted input file that exceeds the application's expected buffer size limits. When SpotAuditor attempts to process this oversized Base64 string during decryption operations, the software fails to properly handle the memory allocation required for processing such large inputs. This results in a segmentation fault or memory corruption that terminates the application process, effectively rendering the software unavailable to legitimate users. The attack vector is particularly concerning because it requires minimal technical expertise to execute, making it accessible to attackers with basic knowledge of application behavior and input manipulation techniques. The vulnerability aligns with ATT&CK technique T1499.004, which covers network denial of service attacks, and demonstrates how seemingly benign input fields can become attack surfaces for service disruption.
The operational impact of CVE-2019-25340 extends beyond simple application crashes to potentially affect broader system availability and user productivity. Organizations relying on SpotAuditor for security auditing and password management may experience service interruptions when attackers exploit this vulnerability, particularly in environments where the application is accessed by multiple users or integrated into automated workflows. The vulnerability's exploitation does not require sophisticated attack infrastructure or specialized knowledge, making it particularly dangerous in production environments where availability is critical. Additionally, this flaw may serve as a precursor to more sophisticated attacks, as attackers often use denial of service conditions to create distractions or establish footholds within target networks. The vulnerability represents a significant risk to business continuity and may require immediate remediation to prevent potential exploitation by malicious actors seeking to disrupt operations or gain unauthorized access to systems through service disruption attacks.
Organizations affected by this vulnerability should implement immediate mitigations including input length validation, buffer size restrictions, and application hardening measures to prevent exploitation. The most effective remediation approach involves updating to a patched version of SpotAuditor that properly handles oversized Base64 inputs through robust input validation and memory management techniques. System administrators should also consider implementing network-level protections such as rate limiting and input filtering to prevent exploitation attempts. Regular security assessments and vulnerability scanning should be conducted to identify similar weaknesses in other applications within the organization's attack surface. The vulnerability demonstrates the critical importance of proper input validation in cryptographic applications and highlights the need for comprehensive security testing during software development lifecycle phases to prevent such issues from reaching production environments.