An exploitable sign extension vulnerability exists in the TextMaker document parsing functionality of SoftMaker Office 2021’s TextMaker application. A specially crafted document can cause the document parser to sign-extend a length used to terminate a loop, which can later result in the loop’s index being used to write outside the bounds of a heap buffer during the reading of file data. An attacker can entice the victim to open a document to trigger this vulnerability.
Conclusion & alert: CVE-2020-13544 is rated High Exploit Risk (72.8/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.58%).Core evidence: 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +1.34% 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-2020-13544
Exploit prediction scoring system (EPSS) score for CVE-2020-13544
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).