CVE-2017-6542
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…
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 21.8%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 3.0
- 9.8 CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 21.82% probability · 98th percentile
- Public exploits
- 1 in Exploit-DB · verified · first 7 June 2017
- CISA KEV
- Not listed
- Weakness
- CWE-119
- Affected
- putty/putty · opensuse/leap · opensuse project/leap
- Source
- cve@mitre.org
EPSS moved from 17.4% on 21 September 2026 to 21.8% on 27 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
Public exploits (1)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
References
- http://lists.opensuse.org/opensuse-updates/2017-03/msg00055.htmlThird Party Advisory
- http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-agent-fwd-overflow.htmlPatch, Vendor Advisory
- http://www.securityfocus.com/bid/97156Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1038067
- https://git.tartarus.org/?p=simon/putty.git%3Ba=commitdiff%3Bh=4ff22863d895cb7ebfced4cf923a012a614adaa8
- https://security.gentoo.org/glsa/201703-03Third Party Advisory, VDB Entry
- https://security.gentoo.org/glsa/201706-09
- https://www.exploit-db.com/exploits/42137/
- http://lists.opensuse.org/opensuse-updates/2017-03/msg00055.htmlThird Party Advisory
- http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-agent-fwd-overflow.htmlPatch, Vendor Advisory
- http://www.securityfocus.com/bid/97156Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1038067
- https://git.tartarus.org/?p=simon/putty.git%3Ba=commitdiff%3Bh=4ff22863d895cb7ebfced4cf923a012a614adaa8
- https://security.gentoo.org/glsa/201703-03Third Party Advisory, VDB Entry
- https://security.gentoo.org/glsa/201706-09
- https://www.exploit-db.com/exploits/42137/
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.