LINE up to 13.15.x TLS certificate validation

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
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CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.9$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in LINE up to 13.15.x. This impacts an unknown function of the component TLS Handler. Executing a manipulation can lead to certificate validation. This vulnerability is registered as CVE-2023-5554. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in LINE up to 13.15.x. This vulnerability affects some unknown functionality of the component TLS Handler. The manipulation with an unknown input leads to a certificate validation vulnerability. The CWE definition for the vulnerability is CWE-295. The product does not validate, or incorrectly validates, a certificate. As an impact it is known to affect integrity. CVE summarizes:

Lack of TLS certificate verification in log transmission of a financial module within LINE prior to 13.16.0.

The weakness was published 10/12/2023. The advisory is shared for download at hackerone.com. This vulnerability was named CVE-2023-5554 since 10/12/2023. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1587.003.

Upgrading to version 13.16.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2023-57854). Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.9

VulDB Base Score: 3.1
VulDB Temp Score: 3.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CNA Base Score: 4.8
CNA Vector (LINE Corporation): 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Certificate validation
CWE: CWE-295 / CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: LINE 13.16.0

Timelineinfo

10/12/2023 🔍
10/12/2023 +0 days 🔍
10/12/2023 +0 days 🔍
12/09/2025 +789 days 🔍

Sourcesinfo

Advisory: hackerone.com
Status: Confirmed

CVE: CVE-2023-5554 (🔍)
GCVE (CVE): GCVE-0-2023-5554
GCVE (VulDB): GCVE-100-242020
EUVD: 🔍

Entryinfo

Created: 10/12/2023 13:24
Updated: 12/09/2025 10:38
Changes: 10/12/2023 13:24 (39), 10/31/2023 14:24 (21), 12/09/2025 10:38 (16)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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