Stack-Based Buffer Overflow in RealTerm Serial Terminal by RealTerm
CVE-2019-25569

6.9MEDIUM

Key Information:

Vendor

Realterm

Status
Realterm: Serial Terminal
Vendor
CVE Published:
21 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2019-25569?

RealTerm Serial Terminal version 2.0.0.70 is susceptible to a stack-based buffer overflow vulnerability within the Echo Port field. This flaw enables local attackers to manipulate the application by injecting a specially crafted input string, which contains 268 bytes of padding and specific overwrite values. Consequently, this action can result in a crash of the application due to the corruption of the Structured Exception Handler (SEH) chain, leading to potential denial of service implications.

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Affected Version(s)

RealTerm: Serial Terminal 2.0.0.70

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2019-25569 - Proof of Concept

References

https://www.exploit-db.com/exploits/46391
exploit
https://realterm.sourceforge.io/
product
https://sourceforge.net/projects/realterm/files/
product

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Alejandra Sánchez
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