CVE-2021-47759Public exploit

SSH password disclosure via process command line

Published Jan 15, 2026 · Updated Jan 15, 2026

Credential exposure in TTY PLUS MTPuTTY 1.0.1.21 allows local users to read plaintext SSH passwords through process listings. When MTPuTTY starts an SSH connection, it places the password in the spawned putty.exe command line, which Windows PowerShell can enumerate. A local account and an active password-based session are required; disclosure enables access to SSH systems configured in MTPuTTY.

CVSS severity6.8
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Credential exposure in TTY PLUS MTPuTTY 1.0.1.21 allows local users to read plaintext SSH passwords through process listings. When MTPuTTY starts an SSH connection, it places the password in the spawned putty.exe command line, which Windows PowerShell can enumerate. A local account and an active password-based session are required; disclosure enables access to SSH systems configured in MTPuTTY.

The record

CVE
CVE-2021-47759
Published
Jan 15, 2026
Updated
Jan 15, 2026
Vendor
TTY PLUS
Product
MTPuTTY
Classifications
CWE-522, T1057
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jan 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.1.21

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

TTY PLUS · MTPuTTYversion=1.0.1.21

Published CVSS scores

6.2VulnCheckCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
6.8VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-522Insufficiently Protected Credentials
T1057Process Discovery

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo