Simon Tatham maintains PuTTY, a widely used terminal emulation and secure-shell client whose modest footprint belies its deep embedding across system administration, development, and operations environments. Vulnerabilities affecting this vendor skew toward serious outcomes, frequently acquire public exploit code, and concentrate in memory-safety and information-disclosure weakness classes that are characteristic of native implementations handling untrusted network protocols. Defenders should track PuTTY releases closely, as flaws in the client affect any endpoint that relies on it for remote access; live severity, exploitation, and exposure counts are shown alongside this summary.
The number and severity of CVEs published that impact products developed by Simon Tatham over time
Signals from CVEs in this vendor scope (7 CVEs).
7 CVEs · Highest risk first
| CVE | Published | CVSS | Risk | KEV | Exploit |
|---|---|---|---|---|---|
CVE-2016-2563CRITICAL 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 cor | Apr 7, 2016 | 9.8 | 62 | NO | YES |
CVE-2013-4852MEDIUM 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 execu | Aug 19, 2013 | 6.8 | 19 | NO | NO |
CVE-2013-4206MEDIUM Heap-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 possibly trigger memory corrup | Aug 19, 2013 | 6.8 | 18 | NO | NO |
CVE-2015-5309MEDIUM 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 EC | Dec 7, 2015 | 4.3 | 15 | NO | NO |
CVE-2013-4207MEDIUM Buffer 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 not properly handled during comp | Aug 19, 2013 | 4.3 | 14 | NO | NO |
The (1) ssh2_load_userkey and (2) ssh2_save_userkey functions in PuTTY 0.51 through 0.63 do not properly wipe SSH-2 private keys from memory, which allows local users to obtain sen | Mar 27, 2015 | 2.1 | 11 | NO | NO |
The rsa_verify function in PuTTY before 0.63 (1) does not clear sensitive process memory after use and (2) does not free certain structures containing sensitive process memory, whi | Aug 19, 2013 | 2.1 | 11 | NO | NO |
Signals from CVEs in this vendor scope (7 CVEs).
An overview of all social media posts that mention a CVE ID that affects a product developed by Simon Tatham.
Media articles that mention a CVE ID that affects a product developed by Simon Tatham — matched by CVE ID, not by vendor name.