Integer 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 service (crash) and possibly execute arbitrary code in certain applications that use PuTTY via a negative size value in an RSA key signature during the SSH handshake, which triggers a heap-based buffer overflow
Published Aug 19, 2013
6.8
MEDIUMCVSS 2.0
EPSS 3.45%
Description
Integer 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 service (crash) and possibly execute arbitrary code in certain applications that use PuTTY via a negative size value in an RSA key signature during the SSH handshake, which triggers a heap-based buffer overflow.
Affected products
No data.
Configuration 1
- ≤ 5.1.5
- 3.7.6
- 3.8.2
- 3.8_beta
- 4.0.4
- 4.0.5
- 4.2.6
- 4.2.7
- 4.2.8
- 4.2.9
- 4.3.2
- 4.3.4
- 4.3.5
- 4.3.6
- 4.3.7
- 4.3.8
- 4.3.9
- 4.4.0
- 5.0
- 5.0.1
- 5.0.2
- 5.0.3
- 5.0.4
- 5.0.5
- 5.0.6
- 5.0.7
- 5.0.8
- 5.0.9
- 5.1
- 5.1.1
- 5.1.2
- 5.1.3
- 5.1.4
Configuration 2
- 6.0
- 7.0
- 7.1
- 12.3
Configuration 3
- 0.45
- 0.46
- 0.47
- 0.48
- 0.49
- 0.50
- 0.51
- 0.52
- 0.53b
- 0.54
- 0.55
- 0.56
- 0.57
- 0.58
- 0.59
- 0.60
- 0.61
- 2010-06-01
- ≤ 0.62
- 0.53
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.
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
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 (8 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.45% (0.03447) | 88.61th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.45% (0.03447) | 87.42th | v5 (v2026.06.15) |
| Mar 17, 2025 | 1.75% (0.01751) | 81.31th | v4 (v2025.03.14) |
| Dec 12, 2024 | 2.14% (0.02141) | 89.69th | v3 (v2023.03.01) |
| Mar 7, 2023 | 2.72% (0.02723) | 88.86th | v3 (v2023.03.01) |
| Mar 6, 2023 | 4.23% (0.04229) | 87.47th | v2 (v2022.01.01) |
| Apr 1, 2022 | 4.23% (0.04229) | 86.19th | v2 (v2022.01.01) |
| Feb 4, 2022 | 4.23% (0.04229) | 69.94th | v2 (v2022.01.01) |
References (11)
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=718779 x_refsource_CONFIRM
- http://lists.opensuse.org/opensuse-updates/2013-08/msg00035.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-updates/2013-08/msg00041.html vendor-advisoryx_refsource_SUSE
- http://secunia.com/advisories/54379 third-party-advisoryx_refsource_SECUNIAVendor Advisory
- http://secunia.com/advisories/54517 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/54533 third-party-advisoryx_refsource_SECUNIA
- http://svn.tartarus.org/sgt?view=revision&sortby=date&revision=9896 x_refsource_MISC
- http://winscp.net/tracker/show_bug.cgi?id=1017 x_refsource_MISC
- http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-signature-stringlen.html x_refsource_CONFIRMVendor Advisory
- http://www.debian.org/security/2013/dsa-2736 vendor-advisoryx_refsource_DEBIAN
- http://www.search-lab.hu/advisories/secadv-20130722 x_refsource_MISC
| Link | Providers | Tags |
|---|---|---|
| http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=718779 | x_refsource_CONFIRM | |
| http://lists.opensuse.org/opensuse-updates/2013-08/msg00035.html | vendor-advisoryx_refsource_SUSE | |
| http://lists.opensuse.org/opensuse-updates/2013-08/msg00041.html | vendor-advisoryx_refsource_SUSE | |
| http://secunia.com/advisories/54379 | third-party-advisoryx_refsource_SECUNIAVendor Advisory | |
| http://secunia.com/advisories/54517 | third-party-advisoryx_refsource_SECUNIA | |
| http://secunia.com/advisories/54533 | third-party-advisoryx_refsource_SECUNIA | |
| http://svn.tartarus.org/sgt?view=revision&sortby=date&revision=9896 | x_refsource_MISC | |
| http://winscp.net/tracker/show_bug.cgi?id=1017 | x_refsource_MISC | |
| http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-signature-stringlen.html | x_refsource_CONFIRMVendor Advisory | |
| http://www.debian.org/security/2013/dsa-2736 | vendor-advisoryx_refsource_DEBIAN | |
| http://www.search-lab.hu/advisories/secadv-20130722 | x_refsource_MISC |
Change history (0)
No recorded changes yet.