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4.6

Firefox OS lockscreen lets nearby attackers guess passcode unlimited

CVE-2015-8512 · published 10 years ago
Summary

Firefox OS versions before 2.5 do not limit how many times someone can try the lockscreen passcode. This means a person standing near the device could keep entering guesses until they get in. Upgrade the device to Firefox OS 2.5 or later, which adds proper lockout after failed attempts, or use additional security measures such as a stronger passcode.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
mozilla firefox_os <= 2.2
cpe:2.3:o:mozilla:firefox_os:*:*:*:*:*:*:*:*
Original advisory text
The lockscreen feature in Mozilla Firefox OS before 2.5 does not properly restrict failed authentication attempts, which makes it easier for physically proximate attackers to obtain access by enter...
The lockscreen feature in Mozilla Firefox OS before 2.5 does not properly restrict failed authentication attempts, which makes it easier for physically proximate attackers to obtain access by entering many passcode guesses.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker partial control (estimated)
Severity
4.6 Medium
Exploitation
<1% chance of attack within 30 days
Type
CWE-284Improper Access Control
Timeline
Published9 Jan 2016
Updated31 Oct 2026
First seen29 Sep 2026
Sources
CVE-2015-8512 · NVD
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