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Vulnerability record · CVE-2019-25679 · published 5 April 2026

CVE-2019-25679: Crun realterm out-of-bounds write vulnerability

Crun · Realterm

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.

8.5 CVSS 4.0 High EPSS 0.31% · top 78.1% CWE-787 · Out-of-bounds write
8.5CVSS 4.0 base score
0.31%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 1 tagged exploit
24 Jul 2026Last modified by NVD

Description

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.

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://realterm.sourceforge.io/ Product
https://sourceforge.net/projects/realterm/files/ Product
https://www.exploit-db.com/exploits/46441 ExploitVDB Entry
https://www.vulncheck.com/advisories/realterm-serial-terminal-buffer-overflow-seh Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2019-25679), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.