CVE-2019-25679 Realterm CVE debrief

Who should care

Users of RealTerm Serial Terminal 2.0.0.70, particularly those with local access to the system, should apply patches or mitigations to prevent exploitation of this vulnerability. Operators, platform administrators, vulnerability management teams, and security teams should review the affected scope and severity to determine the necessary actions.

Technical summary

The vulnerability is caused by a lack of proper input validation in the Echo Port tab of RealTerm Serial Terminal 2.0.0.70. An attacker can exploit this vulnerability by providing a specially crafted payload that overflows the SEH buffer, allowing for arbitrary code execution. The vulnerability has a CVSS score of 8.5 and is classified as HIGH severity. Users of RealTerm Serial Terminal 2.0.0.70, particularly those with local access to the system, should apply patches or mitigations to prevent exploitation of this vulnerability. The Echo Port tab in RealTerm Serial Terminal 2.0.0.70 is affected. 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.

Defensive priority

High

Recommended defensive actions

• Apply patches or updates provided by the vendor
• Use compensating controls such as DEP or ASLR
• Monitor for suspicious activity
• Restrict access to the affected system
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record was published on 2026-04-05T21:16:46.127Z and was last modified on 2026-07-24T22:10:00.140Z. The NVD entry is currently Analyzed. The source details are limited, and defenders should verify the affected scope and severity with the vendor or other trusted sources. The vulnerability allows local attackers to execute arbitrary code by supplying a malicious payload. The Echo Port tab in RealTerm Serial Terminal 2.0.0.70 is affected. Users should apply patches or mitigations to prevent exploitation.

Official resources