CVE-2019-25321
Published: 12 February 2026
Summary
CVE-2019-25321 is a high-severity Stack-based Buffer Overflow (CWE-121) vulnerability in Internet-Soft Ftp Navigator. Its CVSS base score is 8.4 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Client Execution (T1203); ranked at the 47.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-16 (Memory Protection).
Deeper analysis
CVE-2019-25321 is a stack-based buffer overflow vulnerability (CWE-121) affecting FTP Navigator version 8.03. The issue enables attackers to overwrite Structured Exception Handler (SEH) registers by crafting a malicious payload that triggers the overflow when pasted into the Custom Command textbox, resulting in arbitrary code execution.
Remote attackers can exploit this vulnerability without privileges or user interaction, as indicated by its CVSS v3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). Successful exploitation allows full remote code execution on the target system, with a proof-of-concept demonstrating the launch of the Windows calculator.
Advisories and related resources include the vendor site at http://www.internet-soft.com/, Exploit-DB entries at https://www.exploit-db.com/exploits/47794 and https://www.exploit-db.com/exploits/47812, and a VulnCheck advisory at https://www.vulncheck.com/advisories/ftp-navigator-stack-overflow-seh. No patch or specific mitigation details are mentioned in the CVE description.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2019-19572
Vulnerability details
FTP Navigator 8.03 contains a stack overflow vulnerability that allows attackers to execute arbitrary code by overwriting Structured Exception Handler (SEH) registers. Attackers can craft a malicious payload that triggers a buffer overflow when pasted into the Custom Command textbox,…
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enabling remote code execution and launching the calculator as proof of concept.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Stack-based buffer overflow in FTP Navigator client application enables remote arbitrary code execution, directly mapping to Exploitation for Client Execution (T1203).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires timely identification, reporting, and correction of flaws like the stack buffer overflow in CVE-2019-25321, eliminating the vulnerability through patching or removal.
Implements memory safeguards such as DEP, ASLR, and stack canaries that prevent successful SEH register overwrites and arbitrary code execution from stack overflows.
Mandates validation of information inputs like those pasted into the Custom Command textbox to block malicious payloads triggering the buffer overflow.