A security vulnerability causes software company stock to fall by 0.63%

Researchers from Carnegie Mellon University found that a software vendor's share price drops by an average of 0.63% on the day a vulnerability is announced. The study tracked 146 vulnerability disclosures for 18 publicly traded software companies. Microsoft is less affected by this trend than other software vendors, with security vulnerabilities causing only a 0.28% reduction in share price, compared with an average of 0.91% reduction for all other companies.