The vulnerability CVE-2025-53816 affects 7-Zip, a file archiver known for its high compression ratio. This vulnerability allows zeroes written outside the heap buffer in the RAR5 handler, which can lead to memory corruption and denial of service in versions prior to 25.0.0. The presence of this vulnerability poses a risk to organizations utilizing affected versions of 7-Zip.
With a CVSS score of 5.5, this vulnerability is classified as medium severity. The risk to organizations includes potential service disruption due to denial of service. As this vulnerability has yet to be associated with any known exploits, it remains a concern for defenders, especially those using outdated versions of the software.
Organizations should prioritize patching immediately, as version 25.0.0 contains a fix for this issue. Ensuring that all systems are updated will help mitigate the risks associated with this vulnerability.
The urgency for remediation is categorized as medium, given the potential for service disruption. Organizations are advised to include this vulnerability in their priority patch cycle.
Vulnerability Details
The official description of CVE-2025-53816 indicates that it affects the RAR5 handler within 7-Zip versions prior to 25.0.0. The vulnerability is characterized by memory corruption due to zeroes being written outside the heap buffer.
As per the CVSS 4.0 score, this vulnerability is classified with an attack vector of LOCAL, indicating that an attacker would need local access to exploit it. The attack complexity is low, and no privileges or user interaction are required for exploitation. The vulnerability impacts the availability of the system, which is rated high, while the confidentiality and integrity impacts are rated none.
The vulnerability was published on July 17, 2025, and has been categorized under CWE-122, which denotes an out-of-bounds write issue. Organizations using versions of 7-Zip prior to 25.0.0 are susceptible.
Technical Analysis
The root cause of CVE-2025-53816 stems from improper handling of memory in the RAR5 handler of the 7-Zip application. When the application processes RAR5 files, it may inadvertently write data beyond the allocated heap buffer, leading to memory corruption.
The attack vector for this vulnerability is local, meaning an attacker would need access to the system where 7-Zip is installed to exploit the issue. The attack complexity is assessed as low, indicating that the required steps to exploit this vulnerability do not involve sophisticated techniques. No privileges are needed, and user interaction is not required, which may increase the likelihood of exploitation in a local context.
The impact on availability is high, as the memory corruption can result in a denial of service. However, there are no confidentiality or integrity impacts associated with this vulnerability. Given these characteristics, organizations using the affected versions should take this vulnerability seriously.
Risk & Impact Analysis
The risk to organizations includes the potential for service disruptions due to the denial of service caused by memory corruption. This vulnerability represents a significant threat, particularly in environments where 7-Zip is extensively used for file archiving and extraction.
Organizations should consider the blast radius of this vulnerability. If exploited, the impact could extend beyond the individual system to affect other interconnected systems and services, leading to broader operational disruptions.
The urgency assessment indicates that remediation should be scheduled promptly but can be addressed in the priority patch cycle. Organizations are advised to monitor for any updates related to this vulnerability to ensure their systems remain secure.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions prior to 25.0.0 of 7-Zip are affected by this vulnerability. Users are strongly encouraged to upgrade to version 25.0.0 or later to mitigate this risk.
Mitigation & Remediation
Organizations should apply the patch provided in version 25.0.0 of 7-Zip to remediate this vulnerability. If upgrading is not immediately feasible, consider implementing workarounds such as restricting access to the affected software or utilizing alternative archiving tools.
For enhanced security, organizations can also implement configuration hardening by limiting the execution of untrusted files and monitoring for any suspicious activity related to file extraction processes.
Organizations may benefit from engaging with external security services for penetration testing to validate their security posture against similar vulnerabilities.
Detection Guidance
Organizations should monitor logs for indicators of unusual behavior during file extraction processes, which may indicate attempts to exploit this vulnerability.
Look for memory allocation anomalies or crashes related to 7-Zip operations as potential indicators of exploitation.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2025-53816 lies in its implications for memory management practices in software development. This vulnerability illustrates the necessity for rigorous testing and validation processes to prevent memory corruption issues.
The pattern of vulnerabilities related to memory corruption continues to be a concern for organizations, stressing the importance of implementing secure coding practices and thorough code reviews.
Security teams should learn from such vulnerabilities by ensuring that security assessments include memory handling as a focus area. Organizations should prioritize building a robust security framework that includes regular penetration testing methodology to identify similar weaknesses.
Finally, organizations should stay informed on trends related to vulnerabilities such as this by following relevant security blogs and advisories. Regular engagement with the security community can provide insights into emerging threats and remediation strategies.
For further reading on vulnerability management, organizations can consult the following resources: vulnerability management program, cloud security assessment, and web application penetration testing practices to enhance overall security.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
.webp)