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Description

Mobatek MobaXterm 12.1 contains a structured exception handling (SEH) based buffer overflow vulnerability in the username field of session files that allows remote attackers to execute arbitrary code. Attackers can craft a malicious MobaXterm sessions file with overflow data that triggers the vulnerability when imported and executed, enabling reverse shell execution with user privileges.

PUBLISHED Reserved 2026-06-04 | Published 2026-06-04 | Updated 2026-06-04 | Assigner VulnCheck




CRITICAL: 9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CRITICAL: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem types

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Product status

12.1
affected

Credits

Xavi Beltran finder

References

www.exploit-db.com/exploits/47429 (ExploitDB-47429) exploit

download.mobatek.net/...0310554/MobaXterm_Portable_v11.1.zip (Product Reference) product

www.vulncheck.com/...xterm-buffer-overflow-via-sessions-file (VulnCheck Advisory: Mobatek MobaXterm 12.1 Buffer Overflow via Sessions File) third-party-advisory

cve.org (CVE-2019-25741)

nvd.nist.gov (CVE-2019-25741)

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