What’s Vulnerable › Vulnerabilities

CVE-2017-6542

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 21.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2017-03-27 · updated 2026-06-17
• Weakness: CWE-119

Description

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.

Affected products

• openSUSE Leap: 42.2
• Opensuse Project Leap: 42.1
• PuTTY: through 0.67

References

• http://lists.opensuse.org/opensuse-updates/2017-03/msg00055.html
• http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-agent-fwd-overflow.html
• http://www.securityfocus.com/bid/97156
• http://www.securitytracker.com/id/1038067
• https://git.tartarus.org/?p=simon/putty.git%3Ba=commitdiff%3Bh=4ff22863d895cb7ebfced4cf923a012a614adaa8
• https://security.gentoo.org/glsa/201703-03
• https://security.gentoo.org/glsa/201706-09
• https://www.exploit-db.com/exploits/42137/
• http://lists.opensuse.org/opensuse-updates/2017-03/msg00055.html
• http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-agent-fwd-overflow.html
• http://www.securityfocus.com/bid/97156
• http://www.securitytracker.com/id/1038067

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