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Vulnerability record · CVE-2016-2563 · published 7 April 2016

CVE-2016-2563: 9bis kitty memory buffer overflow vulnerability

9bis · Kitty

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.

9.8 CVSS 3.0 Critical EPSS 34% · top 1.6% CWE-119 · Memory buffer overflow
9.8CVSS 3.0 base score, v2 7.5
34%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
14References
17 Jun 2026Last modified by NVD

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
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.html Patch
http://www.securityfocus.com/bid/84296
http://www.securitytracker.com/id/1035257
https://github.com/tintinweb/pub/tree/master/pocs/cve-2016-2563 Vendor 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.html Patch
http://www.securityfocus.com/bid/84296
http://www.securitytracker.com/id/1035257
https://github.com/tintinweb/pub/tree/master/pocs/cve-2016-2563 Vendor Advisory
https://security.gentoo.org/glsa/201606-01

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.8CVE-2024-237499bis kitty command injection vulnerabilityKiTTY versions 0.76.1.13 and before is vulnerable to command injection via the filename variable, occurs due to insufficient input sanitization and v…EPSS 4.7%7.8CVE-2024-250039bis kitty out-of-bounds write vulnerabilityKiTTY versions 0.76.1.13 and before is vulnerable to a stack-based buffer overflow via the hostname, occurs due to insufficient bounds checking and i…EPSS 1.8%7.8CVE-2024-250049bis kitty out-of-bounds write vulnerabilityKiTTY versions 0.76.1.13 and before is vulnerable to a stack-based buffer overflow via the username, occurs due to insufficient bounds checking and i…EPSS 1.8%6.8CVE-2013-4852Winscp vulnerabilityInteger overflow in PuTTY 0.62 and earlier, WinSCP before 5.1.6, and other products that use PuTTY allows remote SSH servers to cause a denial of ser…EPSS 3.4%6.8CVE-2013-4206Putty memory buffer overflow vulnerabilityHeap-based buffer underflow in the modmul function in sshbn.c in PuTTY before 0.63 allows remote SSH servers to cause a denial of service (crash) and…EPSS 2.5%5.9CVE-2023-48795SSH Terrapin attack downgrades channel integrity in OpenSSH and many SSH implementationsThe SSH transport protocol with certain OpenSSH extensions mishandles the handshake and sequence numbers, letting a remote attacker omit packets from…EPSS 93%analysed4.3CVE-2015-5309Opensuse leap vulnerabilityInteger overflow in the terminal emulator in PuTTY before 0.66 allows remote attackers to cause a denial of service (memory corruption) or possibly e…EPSS 3.5%4.3CVE-2013-4207Putty memory buffer overflow vulnerabilityBuffer overflow in sshbn.c in PuTTY before 0.63 allows remote SSH servers to cause a denial of service (crash) via an invalid DSA signature that is n…EPSS 1.8%

Source: NIST National Vulnerability Database (record CVE-2016-2563), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.