Tornado is a Python web framework and asynchronous networking library. The algorithm used for parsing HTTP cookies in Tornado versions prior to 6.4.2 sometimes has quadratic complexity, leading to excessive CPU consumption when parsing maliciously-crafted cookie headers. This parsing occurs in the event loop thread and may block the processing of other requests. Version 6.4.2 fixes the issue.

Open redirect vulnerability in Tornado versions 6.3.1 and earlier allows a remote unauthenticated attacker to redirect a user to an arbitrary web site and conduct a phishing attack by having user access a specially crafted URL.

Tornado before 3.2.2 sends arbitrary responses that contain a fixed CSRF token and may be sent with HTTP compression, which makes it easier for remote attackers to conduct a BREACH attack and determine this token via a series of crafted requests.

CRLF injection vulnerability in the tornado.web.RequestHandler.set_header function in Tornado before 2.2.1 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via crafted input.

Multiple SQL injection vulnerabilities in TornadoStore 1.4.3 and earlier allow remote attackers to execute arbitrary SQL commands via (1) the marca parameter to precios.php3 or (2) the where parameter in a delivery_courier action to control/abm_list.php3.

Multiple cross-site scripting (XSS) vulnerabilities in TornadoStore 1.4.3 and earlier allow remote attackers to inject arbitrary web script or HTML via the (1) tipo or (2) destino parameter to login_registrese.php3 in the Services section, (3) the rubro parameter to precios.php3 in the Products section, (4) the arti parameter to recomenda_articulo.php3 in the Products section, (5) the descrip parameter in a profile action to control/abm_det.php3 in the e-Commerce section, (6) the tit parameter in a delivery_courier action to control/abm_list.php3 in the e-Commerce section, or (7) the tit parameter in an usuario action to control/abm_det.php3 in the e-Commerce section.

Cross-site scripting (XSS) vulnerability in searcher.exe in Tornado Knowledge Retrieval System 4.2 and earlier allows remote attackers to inject arbitrary web script or HTML via the p parameter in a root action.