An exploitable heap-based buffer 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 to explicitly trust a length from a particular record type and use it to write a 16-bit null relative to a buffer allocated on the stack. Due to a lack of bounds-checking on this value, this can allow an attacker to write to memory outside of the buffer and controllably corrupt memory. This can allow an attacker to earn 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-2020-13580 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-2020-13580
Exploit prediction scoring system (EPSS) score for CVE-2020-13580
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).