CRITICAL
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
Published Mar 27, 2017
9.8
CRITICALCVSS 3.0
EPSS 21.82%
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
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.
21.82% 0.21816
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.21816
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (28 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 21.82% (0.21816) | 97.58th | v5 (v2026.06.15) |
| Sep 22, 2026 | 21.82% (0.21816) | 97.53th | v5 (v2026.06.15) |
| Sep 21, 2026 | 17.43% (0.17431) | 97.05th | v5 (v2026.06.15) |
| Sep 6, 2026 | 21.82% (0.21816) | 97.48th | v5 (v2026.06.15) |
| Sep 5, 2026 | 17.43% (0.17431) | 96.98th | v5 (v2026.06.15) |
| Aug 30, 2026 | 21.82% (0.21816) | 97.47th | v5 (v2026.06.15) |
| Aug 28, 2026 | 17.43% (0.17431) | 96.97th | v5 (v2026.06.15) |
| Aug 24, 2026 | 21.82% (0.21816) | 97.45th | v5 (v2026.06.15) |
| Aug 23, 2026 | 17.43% (0.17431) | 96.95th | v5 (v2026.06.15) |
| Jun 15, 2026 | 21.82% (0.21816) | 97.32th | v5 (v2026.06.15) |
| May 29, 2026 | 30.63% (0.30634) | 96.80th | v4 (v2025.03.14) |
| Jan 20, 2026 | 22.15% (0.22153) | 95.61th | v4 (v2025.03.14) |
| Jan 18, 2026 | 24.22% (0.24217) | 95.91th | v4 (v2025.03.14) |
| Nov 21, 2025 | 25.85% (0.25845) | 96.04th | v4 (v2025.03.14) |
| Nov 18, 2025 | 34.42% (0.34418) | 96.76th | v4 (v2025.03.14) |
| Mar 30, 2025 | 25.85% (0.25845) | 95.80th | v4 (v2025.03.14) |
| Mar 29, 2025 | 46.76% (0.46764) | 96.57th | v4 (v2025.03.14) |
| Mar 17, 2025 | 25.85% (0.25845) | 95.80th | v4 (v2025.03.14) |
| Dec 17, 2024 | 10.84% (0.10838) | 95.08th | v3 (v2023.03.01) |
| Nov 8, 2023 | 40.91% (0.40912) | 96.91th | v3 (v2023.03.01) |
| Mar 7, 2023 | 8.80% (0.08799) | 93.50th | v3 (v2023.03.01) |
| Mar 6, 2023 | 10.80% (0.10800) | 94.68th | v2 (v2022.01.01) |
| Apr 1, 2022 | 10.80% (0.10800) | 94.24th | v2 (v2022.01.01) |
| Feb 4, 2022 | 10.80% (0.10800) | 87.78th | v2 (v2022.01.01) |
| Feb 3, 2022 | 9.69% (0.09690) | 87.24th | v1 |
| Jan 6, 2022 | 9.69% (0.09690) | 87.09th | v1 |
| Sep 1, 2021 | 9.69% (0.09690) | 94.89th | v1 |
| Apr 14, 2021 | 9.69% (0.09690) | 0.00th | v1 |
Weaknesses (1)
References (8)
- http://lists.opensuse.org/opensuse-updates/2017-03/msg00055.html vendor-advisoryx_refsource_SUSEThird Party Advisory
- http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-agent-fwd-overflow.html x_refsource_CONFIRMPatchVendor Advisory
- http://www.securityfocus.com/bid/97156 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1038067 vdb-entryx_refsource_SECTRACK
- https://git.tartarus.org/?p=simon/putty.git%3Ba=commitdiff%3Bh=4ff22863d895cb7ebfced4cf923a012a614adaa8 x_refsource_CONFIRM
- https://security.gentoo.org/glsa/201703-03 vendor-advisoryx_refsource_GENTOOThird Party AdvisoryVDB Entry
- https://security.gentoo.org/glsa/201706-09 vendor-advisoryx_refsource_GENTOO
- https://www.exploit-db.com/exploits/42137/ exploitx_refsource_EXPLOIT-DB
| Link | Providers | Tags |
|---|---|---|
| http://lists.opensuse.org/opensuse-updates/2017-03/msg00055.html | vendor-advisoryx_refsource_SUSEThird Party Advisory | |
| http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-agent-fwd-overflow.html | x_refsource_CONFIRMPatchVendor Advisory | |
| http://www.securityfocus.com/bid/97156 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| http://www.securitytracker.com/id/1038067 | vdb-entryx_refsource_SECTRACK | |
| https://git.tartarus.org/?p=simon/putty.git%3Ba=commitdiff%3Bh=4ff22863d895cb7ebfced4cf923a012a614adaa8 | x_refsource_CONFIRM | |
| https://security.gentoo.org/glsa/201703-03 | vendor-advisoryx_refsource_GENTOOThird Party AdvisoryVDB Entry | |
| https://security.gentoo.org/glsa/201706-09 | vendor-advisoryx_refsource_GENTOO | |
| https://www.exploit-db.com/exploits/42137/ | exploitx_refsource_EXPLOIT-DB |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Mar 27, 2017
Updated Aug 5, 2024
Reserved Mar 8, 2017
Link CVE-2017-6542
CISA Vulnrichment
Updated n/a