How severe is CVE-2018-13434?

CVE-2018-13434 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over physical access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-13434 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-13434?

CVE-2018-13434 affects Linecorp Line. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-13434?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-13434 published?

CVE-2018-13434 was published on 2018-08-16 and last updated on 2026-06-17.

CVE-2018-13434

CVE-2018-13434 is a medium-severity vulnerability in Linecorp Line with a CVSS 3.x base score of 6.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: Medium (CVSS 3.x base score 6.3)
CVSS v2: 4.4
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Linecorp Line
Published: 2018-08-16
Last modified: 2026-06-17

Description

An issue was discovered in the LINE jp.naver.line application 8.8.0 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 context of their threat model, which excludes iOS devices on which a jailbreak has occurred

Frequently asked questions

What is CVE-2018-13434?: An issue was discovered in the LINE jp.naver.line application 8.8.0 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 context of their threat model, which excludes iOS devices on which a jailbreak has occurred
How severe is CVE-2018-13434?: CVE-2018-13434 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over physical access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-13434 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-13434?: CVE-2018-13434 affects Linecorp Line. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-13434?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-13434 published?: CVE-2018-13434 was published on 2018-08-16 and last updated on 2026-06-17.

References

https://gist.github.com/tanprathan/f5133651e438b2ad1b39172d52b56115

Affected products (1)

cpe:2.3:a:linecorp:line:8.8.0:*:*:*:*:iphone_os:*:*

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Other CWE-287 (Improper Authentication) vulnerabilities

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