{"id":"CVE-2004-1440","details":"Multiple heap-based buffer overflows in the modpow function in PuTTY before 0.55 allow (1) remote attackers to execute arbitrary code via an SSH2 packet with a base argument that is larger than the mod argument, which causes the modpow function to write memory before the beginning of its buffer, and (2) remote malicious servers to cause a denial of service (client crash) and possibly execute arbitrary code via a large bignum during authentication.","modified":"2026-04-10T03:36:39.135002Z","published":"2004-12-31T05:00:00Z","references":[{"type":"FIX","url":"http://secunia.com/advisories/12212/"},{"type":"FIX","url":"http://www.gentoo.org/security/en/glsa/glsa-200408-04.xml"},{"type":"FIX","url":"http://www.securityfocus.com/bid/10850"},{"type":"WEB","url":"http://marc.info/?l=bugtraq&m=109167869528138&w=2"},{"type":"WEB","url":"http://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html"},{"type":"WEB","url":"http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-modpow.html"},{"type":"WEB","url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/16885"}],"schema_version":"1.7.5"}