Comprehensive testing of 21 free Android antivirus apps revealed big security vulnerabilities and privacy concerns. Three of the apps tested (from VIPRE Mobile, AEGISLAB and BullGuard) had serious security flaws, and seven apps couldn t detect a test virus. In total, 47 percent of the vendors tested failed in some way; vendors have updated the vulnerabilities, according to Comparitech researchers. In addition to the security issues, many apps were down on the job to fall on basic detection.
Source: https://threatpost.com/critical-bug-android-antivirus/146927/