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CVE-2017-6542

CriticalPublished

The ssh_agent_channel_data function in PuTTY before 0.68 allows remote attackers to have unspecified impact via a large length value in an agent protocol...

Published: Mar 27, 2017
Updated: Aug 5, 2024
Assigning CNA: mitre
Evidence observed: Jun 7, 2017

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.0

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

17.4%

Moderate · next 30 days

Percentile: 97.0%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

The ssh_agent_channel_data function in PuTTY before 0.68 allows remote attackers to have unspecified impact via a large length value in an agent protocol message and leveraging the ability to connect to the Unix-domain socket representing the forwarded agent connection, which trigger a buffer overflow.

Sources

PuTTY < 0.68 - 'ssh_agent_channel_data' Integer Overflow Heap CorruptionExploit
Tim Kosse · linux · Jun 7, 2017

Responsible use

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