An exploitable integer overflow vulnerability exists in the PlanMaker document parsing functionality of SoftMaker Office 2021’s PlanMaker application. A specially crafted document can cause the document parser perform arithmetic that may overflow which can result in an undersized heap allocation. Later when copying data from the file into this allocation, a heap-based buffer overflow will occur which can corrupt memory. These types of memory corruptions can allow for code execution under the context of the application. An attacker can entice the victim to open a document to trigger this vulnerability.
Conclusion & alert: CVE-2020-13579 is rated High Exploit Risk (86/100): CVSS High severity, with high exploitation likelihood (EPSS 72.56%, 99th percentile).Core evidence: 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +68.74% over the last day, indicating growing attacker interest.Mandatory action: Public exploits are available—assess exposure, apply mitigations, and prioritize patching.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
Public exploit references (Exploit-DB) for CVE-2020-13579
Exploit prediction scoring system (EPSS) score for CVE-2020-13579
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).