system
Describe <CVE-2015-2689>.
user
What is <CVE-2015-2689>?
assistant
Tor before 0.2.4.26 and 0.2.5.x before 0.2.5.11 does not properly handle pending-connection resolve states during periods of high DNS load, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via crafted packets..