CVE-2016-2563
Stack-based buffer overflow in the SCP command-line utility in PuTTY before 0.67 and KiTTY 0.66.6.3 and earlier allows remote servers to cause a denial of service (stack memory corruption) or execute arbitrary code via a crafted SCP-SINK file-size…
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 32.8%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.
Description
Stack-based buffer overflow in the SCP command-line utility in PuTTY before 0.67 and KiTTY 0.66.6.3 and earlier allows remote servers to cause a denial of service (stack memory corruption) or execute arbitrary code via a crafted SCP-SINK file-size response to an SCP download request.
- 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
- 32.80% probability · 98th percentile
- Public exploits
- 1 in Exploit-DB · first 10 March 2016
- CISA KEV
- Not listed
- Weakness
- CWE-119
- Affected
- 9bis/kitty · simon tatham/putty
- Source
- cve@mitre.org
EPSS moved from 28.5% on 21 September 2026 to 32.8% on 26 October 2026, peaking at 34.2% on 22 September 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/2016-05/msg00131.html
- http://seclists.org/fulldisclosure/2016/Mar/22
- http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-pscp-sink-sscanf.htmlPatch
- http://www.securityfocus.com/bid/84296
- http://www.securitytracker.com/id/1035257
- https://github.com/tintinweb/pub/tree/master/pocs/cve-2016-2563Vendor Advisory
- https://security.gentoo.org/glsa/201606-01
- http://lists.opensuse.org/opensuse-updates/2016-05/msg00131.html
- http://seclists.org/fulldisclosure/2016/Mar/22
- http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-pscp-sink-sscanf.htmlPatch
- http://www.securityfocus.com/bid/84296
- http://www.securitytracker.com/id/1035257
- https://github.com/tintinweb/pub/tree/master/pocs/cve-2016-2563Vendor Advisory
- https://security.gentoo.org/glsa/201606-01
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.