Putty

PuTTY is a widely used SSH and Telnet client whose vulnerability footprint, while concentrated in a single product, carries disproportionate impact due to its ubiquity in system administration and remote-access workflows. Vulnerabilities affecting the vendor skew strongly toward critical-severity outcomes and frequently acquire public exploit code, reflecting the sensitivity of credential handling and protocol implementation in a client that sits at the boundary between user systems and backend infrastructure. The recurring weakness classes center on memory-safety issues such as buffer-boundary violations and out-of-bounds access, alongside input-validation and information-disclosure flaws that are characteristic of native C implementations handling untrusted network data. Defenders should prioritize PuTTY updates in environments where it manages access to sensitive systems, and should treat the client as part of the baseline hygiene for administrative workstations. Current severity, exploitation activity, and exposure metrics are shown alongside this summary.