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CVE-2021-36367

CVE-2021-36367

This page contains facts from public vulnerability sources. Check the original advisory before updating.

PuTTY through 0.75 proceeds with establishing an SSH session even if it has never sent a substantive authentication response. This makes it easier for an attacker-controlled SSH server to present a later spoofed authentication prompt (that the attacker can use to capture credential data, and use that data for purposes that are undesired by the client user).

CVSS 8.1 · High · EPSS 1.1% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • n/a

    Versions
    • n/a: Affected

    No fix published

  • putty Debian:12

    Affected ranges
    • ECOSYSTEM: < 0.75-3

    Update to 0.75-3

  • putty Debian:13

    Affected ranges
    • ECOSYSTEM: < 0.75-3

    Update to 0.75-3

  • putty Debian:14

    Affected ranges
    • ECOSYSTEM: < 0.75-3

    Update to 0.75-3

  • putty Ubuntu:16.04:LTS

    Versions
    • 0.65-2
    • 0.66-1
    • 0.66-2
    • 0.66-3
    • 0.66-4
    • 0.67-1
    • 0.67-2
    • 0.67-3build0.16.04.1
    • 0.67-3+deb9u1build0.16.04.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • putty Ubuntu:18.04:LTS

    Versions
    • 0.70-1
    • 0.70-2
    • 0.70-3
    • 0.70-4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • putty Ubuntu:20.04:LTS

    Versions
    • 0.72-1
    • 0.73-1
    • 0.73-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • putty Ubuntu:22.04:LTS

    Versions
    • 0.75-3
    • 0.76-1
    • 0.76-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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