CVE-2019-25679

RealTerm Serial Terminal 2.0.0.70 contains a structured exception handling (SEH) buffer overflow vulnerability in the Echo Port tab that allows local attackers to execute arbitrary code by supplying a malicious payload. Attackers can craft a buffer overflow payload with a POP POP RET gadget chain and shellcode that triggers code execution when pasted into the Port field and the Change button is clicked.

Score

CVSS 4.0 8.5 High

Status

Analyzed - disclosure@vulncheck.com

Published

2026-04-05

Last modified

2026-04-06

Weaknesses

CWE-787

Affected products

• Realterm (Crun)
• Realterm Serial Terminal (Realterm)

References

• https://realterm.sourceforge.io/
• https://sourceforge.net/projects/realterm/files/
• https://www.exploit-db.com/exploits/46441
• https://www.vulncheck.com/advisories/realterm-serial-terminal-buffer-overflow-seh