MEDIUM
Integer overflow in the terminal emulator in PuTTY before 0.66 allows remote attackers to cause a denial of service (memory corruption) or possibly execute arbitrary code via an ECH (erase characters) escape sequence with a large parameter value, which triggers a buffer underflow
Published Dec 7, 2015
4.3
MEDIUMCVSS 2.0
EPSS 3.47%
Description
Integer overflow in the terminal emulator in PuTTY before 0.66 allows remote attackers to cause a denial of service (memory corruption) or possibly execute arbitrary code via an ECH (erase characters) escape sequence with a large parameter value, which triggers a buffer underflow.
Affected products
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
4.3 MEDIUM NVD
AV:N/AC:M/Au:N/C:N/I:N/A:P
Access Vector Network
Access Complexity Medium
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
3.47% 0.03467
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.03467
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 (13 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.47% (0.03467) | 88.67th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.47% (0.03467) | 87.49th | v5 (v2026.06.15) |
| Mar 30, 2025 | 2.07% (0.02065) | 82.32th | v4 (v2025.03.14) |
| Mar 29, 2025 | 6.88% (0.06885) | 85.29th | v4 (v2025.03.14) |
| Mar 17, 2025 | 2.26% (0.02261) | 83.45th | v4 (v2025.03.14) |
| Dec 12, 2024 | 2.23% (0.02234) | 89.93th | v3 (v2023.03.01) |
| Jan 6, 2024 | 2.14% (0.02143) | 88.11th | v3 (v2023.03.01) |
| Jul 25, 2023 | 2.10% (0.02095) | 87.63th | v3 (v2023.03.01) |
| Mar 9, 2023 | 1.93% (0.01933) | 86.80th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.68% (0.01684) | 85.71th | v3 (v2023.03.01) |
| Mar 6, 2023 | 4.97% (0.04967) | 89.52th | v2 (v2022.01.01) |
| Apr 1, 2022 | 4.97% (0.04967) | 88.46th | v2 (v2022.01.01) |
| Feb 4, 2022 | 4.97% (0.04967) | 74.95th | v2 (v2022.01.01) |
Weaknesses (1)
References (7)
- http://lists.fedoraproject.org/pipermail/package-announce/2015-December/173021.html vendor-advisoryx_refsource_FEDORA
- http://lists.fedoraproject.org/pipermail/package-announce/2015-December/173094.html vendor-advisoryx_refsource_FEDORA
- http://lists.opensuse.org/opensuse-updates/2015-11/msg00099.html vendor-advisoryx_refsource_SUSE
- http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-ech-overflow.html x_refsource_CONFIRMVendor Advisory
- http://www.debian.org/security/2015/dsa-3409 vendor-advisoryx_refsource_DEBIAN
- http://www.securitytracker.com/id/1034308 vdb-entryx_refsource_SECTRACK
- https://security.gentoo.org/glsa/201606-01 vendor-advisoryx_refsource_GENTOO
| Link | Providers | Tags |
|---|---|---|
| http://lists.fedoraproject.org/pipermail/package-announce/2015-December/173021.html | vendor-advisoryx_refsource_FEDORA | |
| http://lists.fedoraproject.org/pipermail/package-announce/2015-December/173094.html | vendor-advisoryx_refsource_FEDORA | |
| http://lists.opensuse.org/opensuse-updates/2015-11/msg00099.html | vendor-advisoryx_refsource_SUSE | |
| http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-ech-overflow.html | x_refsource_CONFIRMVendor Advisory | |
| http://www.debian.org/security/2015/dsa-3409 | vendor-advisoryx_refsource_DEBIAN | |
| http://www.securitytracker.com/id/1034308 | vdb-entryx_refsource_SECTRACK | |
| 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 redhat
Published Dec 7, 2015
Updated Aug 6, 2024
Reserved Jul 1, 2015
Link CVE-2015-5309
CISA Vulnrichment
Updated n/a