Redis is an open source, in-memory database that persists on disk. A medium-severity vulnerability (CVE-2025-46819) exists in Redis versions 8.2.1 and below, allowing an authenticated user to use a specially crafted Lua script to either read out-of-bound data or crash the server, resulting in a denial of service. This issue is particularly concerning as it affects all versions of Redis with Lua scripting capabilities.
The vulnerability has been assigned a CVSS score of 6.3, indicating its medium severity. Organizations should prioritize patching to version 8.2.2, where the issue has been addressed. Failure to do so could expose sensitive data and affect system availability.
Currently, there is a known exploit available for this vulnerability, which further highlights the urgency for organizations to implement the necessary patches. The security community has already started to analyze this vulnerability, and mitigation strategies, such as blocking Lua script execution via ACL, are recommended.
Organizations should address this vulnerability in their priority patch cycle to avoid potential exploitation and ensure the ongoing security of their Redis deployments.
Vulnerability Details
The CVE-2025-46819 vulnerability allows an authenticated user to execute malicious Lua scripts that can lead to out-of-bounds data access or server crashes. This vulnerability is classified under CWE-190 (Integer Overflow or Wraparound) and CWE-125 (Out-of-bounds Read).
The issue exists in all Redis versions with Lua scripting and has been officially resolved in version 8.2.2. Organizations are encouraged to update their Redis installations to this version immediately to eliminate the risk.
The vulnerability’s CVSS score of 6.3 indicates a medium severity level, suggesting that while it is serious, it may not be an immediate threat to all deployments. However, given the potential for significant impact, organizations should treat it with urgency.
Technical Analysis
The root cause of this vulnerability lies in how Redis handles Lua script execution. Specifically, the vulnerability arises from improper input validation, which can lead to out-of-bounds read conditions. Attackers may leverage this to gain unauthorized access to sensitive information or crash the Redis server.
The attack vector is local, meaning that an attacker must have authenticated access to the Redis server. The complexity of the attack is high, as it requires crafting a specific Lua script to exploit the flaw. Privileges required for exploitation are low, as any authenticated user can execute the malicious script without further interaction.
The vulnerability impacts confidentiality, as attackers may read sensitive data. However, there is no integrity impact, and availability is significantly affected due to the potential for server crashes.
Risk & Impact Analysis
Risk to organizations includes unauthorized data access and potential service interruptions. Given the nature of Redis as a widely-used database in various applications, the impact of this vulnerability can be substantial, especially in environments where sensitive data is stored.
Organizations should assess their risk exposure based on the deployment of affected Redis versions. The potential blast radius is considerable, given that many applications may rely on Redis for data storage and caching.
The urgency assessment based on the CVSS score indicates that organizations should address this vulnerability in their priority patch cycle. Immediate attention is necessary to ensure that Redis deployments are not susceptible to attacks that exploit this vulnerability.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of Redis prior to 8.2.2 are affected by this vulnerability. Specific vulnerable versions include 8.2.1 and below, as well as certain ranges in versions 7.x and 6.x. Organizations should verify their Redis deployments against these criteria.
Mitigation & Remediation
Organizations should prioritize patching to Redis version 8.2.2 to remediate the vulnerability. If immediate patching is not feasible, a temporary mitigation strategy involves restricting Lua script execution by configuring ACL to block the EVAL and FUNCTION command families.
For more information on continuous security testing, organizations can visit continuous penetration testing services to validate their environments.
Detection Guidance
To detect potential exploitation, organizations should monitor logs for unusual Lua script execution and access patterns. Look for behavioral anomalies that indicate unauthorized access attempts or excessive resource consumption, which may signify exploitation of this vulnerability.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2025-46819 highlights the ongoing challenges organizations face with Lua scripting in database environments. This vulnerability serves as a reminder for security teams to implement robust input validation and to restrict script execution capabilities.
Organizations should also consider implementing a vulnerability management program to proactively identify and mitigate similar vulnerabilities in the future.
Additionally, understanding the patterns of vulnerabilities like CVE-2025-46819 can aid in developing effective penetration testing methodologies that encompass script execution scenarios.
Lastly, organizations should leverage external resources and expertise in vulnerability management to stay ahead of emerging threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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