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Vulnerability DatabaseCVE-2021-39520
CVE-2021-39520:
NixOS vulnerability analysis and mitigation
Overview
A NULL pointer dereference vulnerability was discovered in libjpeg through version 2020021. The vulnerability exists in the function BlockBitmapRequester::PushReconstructedData() located in blockbitmaprequester.cpp (NVD, MITRE CVE).
Technical details
The vulnerability has been assigned a CVSS v3.1 base score of 6.5 (Medium) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H. The issue occurs in the BlockBitmapRequester::PushReconstructedData() function when processing certain JPEG files, which can trigger a NULL pointer dereference at line 1182 of blockbitmaprequester.cpp (GitHub Issue).
Impact
When exploited, this vulnerability allows an attacker to cause a Denial of Service (DoS) condition by triggering a segmentation fault in the application processing the malicious JPEG file (NVD).
Mitigation and workarounds
The vulnerability affects libjpeg versions through 2020021. Users should upgrade to a patched version of the library when available (Debian Security Tracker).
Additional resources
Source: This report was generated using AI
Related NixOS vulnerabilities:
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