{"cve":"CVE-2015-5309","nvd":{"published":"2015-12-07T20:59:08.060","modified":"2026-06-17T00:28:54.180","status":"Modified","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.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-189"],"references":["http://lists.fedoraproject.org/pipermail/package-announce/2015-December/173021.html","http://lists.fedoraproject.org/pipermail/package-announce/2015-December/173094.html","http://lists.opensuse.org/opensuse-updates/2015-11/msg00099.html","http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-ech-overflow.html","http://www.debian.org/security/2015/dsa-3409"],"products":["opensuse:leap","opensuse:opensuse","simon_tatham:putty"],"source":"nvd","synced_at":"2026-10-19T20:37:45.466985407+00:00"},"epss":{"cve":"CVE-2015-5309","score":0.03467,"percentile":0.89063,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}