CVE-2021-39515 : What You Need to Know
Learn about CVE-2021-39515, a vulnerability in libjpeg through 2020021 that allows attackers to execute a Denial of Service attack by exploiting a NULL pointer dereference.
This CVE article discusses a vulnerability in libjpeg through 2020021 that enables a Denial of Service attack due to a NULL pointer dereference in the ParseMCU function.
Understanding CVE-2021-39515
This section provides an overview of the vulnerability identified in the libjpeg library.
What is CVE-2021-39515?
An issue in libjpeg through 2020021 creates a NULL pointer dereference in the SampleInterleavedLSScan::ParseMCU() function, allowing attackers to execute a Denial of Service attack.
The Impact of CVE-2021-39515
The vulnerability permits attackers to cause Denial of Service, potentially disrupting systems that rely on the affected libjpeg library.
Technical Details of CVE-2021-39515
This section delves into the technical aspects of the CVE.
Vulnerability Description
The vulnerability arises from a NULL pointer dereference in the ParseMCU function of the SampleInterleavedLSScan in libjpeg, leading to a Denial of Service attack.
Affected Systems and Versions
- Affected Systems: Not applicable
- Affected Versions: Not applicable
Exploitation Mechanism
The vulnerability can be exploited by manipulating certain parameters to trigger the NULL pointer dereference in the libjpeg library.
Mitigation and Prevention
Suggestions on how to mitigate and prevent exploitation of CVE-2021-39515.
Immediate Steps to Take
- Apply patches or updates provided by the libjpeg project.
- Implement network security measures to restrict access to vulnerable systems.
Long-Term Security Practices
- Regularly update software libraries and dependencies in your projects.
- Conduct routine security assessments to detect vulnerabilities early.
Patching and Updates
Stay informed about security patches and updates released by the libjpeg project to address CVE-2021-39515.