CyberRota Analysis
This is a medium severity vulnerability with a CVSS score of 5.9. See the original NVD description below for full technical details.
CVE
CVE-2019-12521
Severity
MEDIUM
CVSS
5.9
EPSS
5.76%
Original NVD Description
An issue was discovered in Squid through 4.7. When Squid is parsing ESI, it keeps the ESI elements in ESIContext. ESIContext contains a buffer for holding a stack of ESIElements. When a new ESIElement is parsed, it is added via addStackElement. addStackElement has a check for the number of elements in this buffer, but it's off by 1, leading to a Heap Overflow of 1 element. The overflow is within the same structure so it can't affect adjacent memory blocks, and thus just leads to a crash while processing.
Related CVEs
Other vulnerabilities affecting the same vendor(s)