CRITICAL
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
Published Apr 7, 2016
9.8
CRITICALCVSS 3.0
EPSS 34.22%
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.
Affected products
No data.
OR
- ≤ 0.66.6.3
- ≤ 0.66
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
9.8 CRITICAL NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact High
7.5 HIGH NVD
AV:N/AC:L/Au:N/C:P/I:P/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact Partial
Integrity Impact Partial
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
34.22% 0.34216
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.34216
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (57 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 34.22% (0.34216) | 98.36th | v5 (v2026.06.15) |
| Sep 22, 2026 | 34.22% (0.34216) | 98.33th | v5 (v2026.06.15) |
| Sep 21, 2026 | 28.53% (0.28528) | 98.09th | v5 (v2026.06.15) |
| Sep 6, 2026 | 34.22% (0.34216) | 98.30th | v5 (v2026.06.15) |
| Sep 5, 2026 | 28.53% (0.28528) | 98.05th | v5 (v2026.06.15) |
| Aug 30, 2026 | 34.22% (0.34216) | 98.29th | v5 (v2026.06.15) |
| Aug 28, 2026 | 28.53% (0.28528) | 98.04th | v5 (v2026.06.15) |
| Aug 24, 2026 | 34.22% (0.34216) | 98.28th | v5 (v2026.06.15) |
| Aug 23, 2026 | 28.53% (0.28528) | 98.04th | v5 (v2026.06.15) |
| Jun 15, 2026 | 34.22% (0.34216) | 98.19th | v5 (v2026.06.15) |
| May 30, 2026 | 26.59% (0.26586) | 96.42th | v4 (v2025.03.14) |
| Mar 4, 2026 | 28.63% (0.28635) | 96.44th | v4 (v2025.03.14) |
| Mar 1, 2026 | 23.40% (0.23404) | 95.88th | v4 (v2025.03.14) |
| Feb 4, 2026 | 28.63% (0.28635) | 96.41th | v4 (v2025.03.14) |
| Feb 1, 2026 | 23.40% (0.23404) | 95.84th | v4 (v2025.03.14) |
| Jan 4, 2026 | 28.63% (0.28635) | 96.37th | v4 (v2025.03.14) |
| Jan 1, 2026 | 23.40% (0.23404) | 95.82th | v4 (v2025.03.14) |
| Dec 4, 2025 | 28.63% (0.28635) | 96.34th | v4 (v2025.03.14) |
| Dec 1, 2025 | 23.40% (0.23404) | 95.77th | v4 (v2025.03.14) |
| Nov 4, 2025 | 28.63% (0.28635) | 96.31th | v4 (v2025.03.14) |
| Nov 1, 2025 | 23.40% (0.23404) | 95.76th | v4 (v2025.03.14) |
| Oct 4, 2025 | 28.63% (0.28635) | 96.36th | v4 (v2025.03.14) |
| Oct 1, 2025 | 23.40% (0.23404) | 95.79th | v4 (v2025.03.14) |
| Sep 7, 2025 | 28.63% (0.28635) | 96.37th | v4 (v2025.03.14) |
| Sep 4, 2025 | 22.89% (0.22887) | 95.70th | v4 (v2025.03.14) |
| Sep 1, 2025 | 18.37% (0.18370) | 95.02th | v4 (v2025.03.14) |
| Aug 6, 2025 | 22.89% (0.22887) | 95.66th | v4 (v2025.03.14) |
| Aug 1, 2025 | 18.37% (0.18370) | 95.00th | v4 (v2025.03.14) |
| Jul 13, 2025 | 22.89% (0.22887) | 95.63th | v4 (v2025.03.14) |
| Jul 6, 2025 | 34.65% (0.34654) | 96.81th | v4 (v2025.03.14) |
| Jul 1, 2025 | 28.86% (0.28864) | 96.35th | v4 (v2025.03.14) |
| Jun 12, 2025 | 34.65% (0.34654) | 96.79th | v4 (v2025.03.14) |
| Jun 7, 2025 | 19.60% (0.19596) | 95.09th | v4 (v2025.03.14) |
| Jun 4, 2025 | 17.58% (0.17579) | 94.73th | v4 (v2025.03.14) |
| Jun 1, 2025 | 11.88% (0.11879) | 93.38th | v4 (v2025.03.14) |
| May 4, 2025 | 13.37% (0.13374) | 93.76th | v4 (v2025.03.14) |
| May 1, 2025 | 11.88% (0.11879) | 93.36th | v4 (v2025.03.14) |
| Apr 5, 2025 | 13.37% (0.13374) | 93.59th | v4 (v2025.03.14) |
| Apr 4, 2025 | 11.88% (0.11879) | 93.12th | v4 (v2025.03.14) |
| Apr 1, 2025 | 13.37% (0.13374) | 93.58th | v4 (v2025.03.14) |
| Mar 31, 2025 | 11.88% (0.11879) | 93.10th | v4 (v2025.03.14) |
| Mar 30, 2025 | 13.37% (0.13374) | 93.57th | v4 (v2025.03.14) |
| Mar 29, 2025 | 16.64% (0.16639) | 91.56th | v4 (v2025.03.14) |
| Mar 28, 2025 | 13.37% (0.13374) | 93.57th | v4 (v2025.03.14) |
| Mar 27, 2025 | 11.88% (0.11879) | 92.71th | v4 (v2025.03.14) |
| Mar 25, 2025 | 13.37% (0.13374) | 93.51th | v4 (v2025.03.14) |
| Mar 24, 2025 | 11.88% (0.11879) | 93.09th | v4 (v2025.03.14) |
| Mar 19, 2025 | 13.37% (0.13374) | 93.34th | v4 (v2025.03.14) |
| Mar 18, 2025 | 11.88% (0.11879) | 93.21th | v4 (v2025.03.14) |
| Mar 17, 2025 | 13.37% (0.13374) | 93.63th | v4 (v2025.03.14) |
| Dec 12, 2024 | 1.62% (0.01616) | 87.97th | v3 (v2023.03.01) |
| Jan 29, 2024 | 1.62% (0.01616) | 86.15th | v3 (v2023.03.01) |
| Oct 21, 2023 | 2.03% (0.02028) | 87.66th | v3 (v2023.03.01) |
| Mar 7, 2023 | 2.50% (0.02501) | 88.41th | v3 (v2023.03.01) |
| Mar 6, 2023 | 13.75% (0.13751) | 95.78th | v2 (v2022.01.01) |
| Apr 1, 2022 | 13.75% (0.13751) | 95.42th | v2 (v2022.01.01) |
| Feb 4, 2022 | 13.75% (0.13751) | 90.84th | v2 (v2022.01.01) |
Weaknesses (1)
References (7)
- http://lists.opensuse.org/opensuse-updates/2016-05/msg00131.html vendor-advisoryx_refsource_SUSE
- http://seclists.org/fulldisclosure/2016/Mar/22 mailing-listx_refsource_FULLDISC
- http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-pscp-sink-sscanf.html x_refsource_CONFIRMPatch
- http://www.securityfocus.com/bid/84296 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id/1035257 vdb-entryx_refsource_SECTRACK
- https://github.com/tintinweb/pub/tree/master/pocs/cve-2016-2563 x_refsource_MISCVendor Advisory
- https://security.gentoo.org/glsa/201606-01 vendor-advisoryx_refsource_GENTOO
| Link | Providers | Tags |
|---|---|---|
| http://lists.opensuse.org/opensuse-updates/2016-05/msg00131.html | vendor-advisoryx_refsource_SUSE | |
| http://seclists.org/fulldisclosure/2016/Mar/22 | mailing-listx_refsource_FULLDISC | |
| http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-pscp-sink-sscanf.html | x_refsource_CONFIRMPatch | |
| http://www.securityfocus.com/bid/84296 | vdb-entryx_refsource_BID | |
| http://www.securitytracker.com/id/1035257 | vdb-entryx_refsource_SECTRACK | |
| https://github.com/tintinweb/pub/tree/master/pocs/cve-2016-2563 | x_refsource_MISCVendor Advisory | |
| https://security.gentoo.org/glsa/201606-01 | vendor-advisoryx_refsource_GENTOO |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Apr 7, 2016
Updated Aug 5, 2024
Reserved Feb 25, 2016
Link CVE-2016-2563
CISA Vulnrichment
Updated n/a