AndroidVulnerabilities.org

FUM Scores

Calculating the FUM score

We developed the FUM score to compare the security provided by different device manufacturers. The score gives each Android manufacturer a score out of 10 based on the security they have provided to their customers over the last four years.

The score has three components:

f
the proportion of devices free from known critical vulnerabilities.
u
the proportion of devices updated to the most recent version.
m
the number of vulnerabilities the manufacturer has not yet fixed on any device.
FUM score = 4 cdot f + 3 cdot u + 3 cdot { {2} over {1+e^m} }

Scores out of 10 for manufacturers and for Nexus devices

Nexus devices 5.76 (best)
LG 4.53 
Motorola 3.34 
Samsung 2.81 
Sony 2.78 
Asus 2.61 
HTC 2.6 
alps 0.726 
Symphony 0.309 
walton 0.272 (worst)

Scores out of 10 for network operators

T-Mobile 3.98 (best)
O2 uk 3.98 
Orange 3.71 
Sprint 3.5 
3 3.43 
Vodafone uk 3.21 
AT&T 3.19 
unknown 3.09 
Verizon 3.07 
n Telenor 1.96 
Airtel 0.885 
Grameenphone 0.501 
Robi 0.48 
banglalink 0.366 (worst)

Scores out of 10 for device models

Galaxy Nexus 4.74 (best)
Nexus 5 4.6 
Nexus 4 4.3 
Nexus 7 3.64 
HTC Desire 3.25 
Desire HD 2.91 
GT-I9000 2.63 
DROIDX 2.48 
HTC Sensation Z710e 2.44 
GT-I9100 2.25 
HTC One 1.94 
HTC Desire S 1.74 
GT-N7000 1.43 
GT-P1000 0.897 
GT-I9505 0.747 
GT-I9300 0.621 
HTC Desire HD A9191 0.277 
GT-N7100 0.253 
Symphony W68 9.91e-05 (worst)