CVE-2018-12271: An issue was discovered in the com.getdropbox.Dropbox app 100.2 for iOS

Routine

MEDIUM 6.4DOWNGRADE

CVE-2018-12271 is a medium-severity flaw (CVSS 6.4) affecting dropbox. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in the com.getdropbox.Dropbox app 100.2 for iOS. The LAContext class for Biometric (TouchID) validation allows authentication bypass by overriding the LAContext return Boolean value to be "true" because the kSecAccessControlUserPresence protection mechanism is not used. In other words, an attacker could authenticate with an arbitrary fingerprint. NOTE: the vendor indicates that this is not an attack of interest within the

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.4 (Medium)
Attack vector	Physical
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 63%)
CISA exploited list	No
Weakness	CWE-287
Published	2018-06-13
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: dropbox

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-06-13 23:29 UTCPublished CVE record published
2026-06-17 01:37 UTCUpdated Record last modified

dropbox dropbox DOWNGRADE

Affected: 100.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 100.2

1. Check installed version

apt-cache policy dropbox || rpm -q dropbox || dropbox --version

2. No fixed release: DOWNGRADE to a release before 100.2 (Debian / Ubuntu)

apt-cache madison dropbox sudo apt install dropbox=<VERSION_BEFORE_100.2> sudo apt-mark hold dropbox

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list dropbox sudo dnf downgrade dropbox-<VERSION_BEFORE_100.2> sudo dnf versionlock add dropbox

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-12271?

dropbox: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-12271 being exploited?

CVE-2018-12271 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-12271 affect?

CVE-2018-12271 affects dropbox. Severity is medium (CVSS 6.4). An issue was discovered in the com.getdropbox.Dropbox app 100.2 for iOS. The LAContext class for Biometric (TouchID) validation allows authentication bypass by overriding the LAContext return Boolean value to be "true" because the kSecAcces

How urgent is CVE-2018-12271?

Priority 32/100. No elevated risk signals yet.

Software pages

iOS vulnerabilities · Dropbox vulnerabilities

Related CVEs

CVE-2019-12171 HIGH 7.8 DOWNGRADE Dropbox.exe (and QtWebEngineProcess.exe in the Web Helper) in the Dropbox desktop application 71.4.108.0 store
CVE-2018-12446 LOW 3.6 DOWNGRADE An issue was discovered in the com.dropbox.android application 98.2.2 for Android
CVE-2018-12445 LOW 3.1 DOWNGRADE An issue was discovered in the com.dropbox.android application 98.2.2 for Android
CVE-2010-3354 MEDIUM 6.9 DOWNGRADE dropboxd in Dropbox 0.7.110 places a zero-length directory name in the LD_LIBRARY_PATH, which allows local use
CVE-2007-0974 HIGH 7.5 DOWNGRADE Multiple unspecified vulnerabilities in Ian Bezanson DropBox before 0.0.4 beta have unknown impact and attack

References

← Back to latest CVEs