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Vulnerability record · CVE-2019-25569 · published 21 March 2026

CVE-2019-25569: Crun realterm out-of-bounds write vulnerability

Crun · Realterm

RealTerm Serial Terminal 2.0.0.70 contains a stack-based buffer overflow vulnerability in the Echo Port field that allows local attackers to crash the application by triggering a structured exception handler (SEH) chain corruption. Attackers can craft a malicious input string with 268 bytes of padding followed by SEH overwrite values and paste it into the Port field to cause denial of service.

6.9 CVSS 4.0 Medium EPSS 0.19% · top 92.2% CWE-787 · Out-of-bounds write
6.9CVSS 4.0 base score
0.19%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 1 tagged exploit
17 Jun 2026Last modified by NVD

Description

RealTerm Serial Terminal 2.0.0.70 contains a stack-based buffer overflow vulnerability in the Echo Port field that allows local attackers to crash the application by triggering a structured exception handler (SEH) chain corruption. Attackers can craft a malicious input string with 268 bytes of padding followed by SEH overwrite values and paste it into the Port field to cause denial of service.

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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/46391 ExploitThird Party AdvisoryVDB Entry
https://www.vulncheck.com/advisories/realterm-serial-terminal-seh-overflow-crash 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-2019-25569), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.