# CVE-2023-5554: Weak cryptography in LINE client for iOS

> Attackers can intercept log data due to missing TLS verification in the LINE iOS app, exposing sensitive information.

- **Severity:** Medium 4.8 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 12 Oct 2023
- **Updated:** 9 Dec 2025
- **Also known as:** GHSA-9q93-64jr-x633

## What is CVE-2023-5554?

CVE-2023-5554 is a medium-severity vulnerability in Linecorp Line, published on 12 Oct 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

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

Weakness: CWE-295 (Improper Certificate Validation)

## Which versions are affected by CVE-2023-5554?

It affects 1 product.


Products: Linecorp Line.

## How do I fix CVE-2023-5554?

No fix has been published for CVE-2023-5554 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-5554 being exploited?

There is no known exploitation of CVE-2023-5554 in the wild and no public exploit code.

## Other vulnerabilities in Linecorp Line

- [CVE-2023-45559](https://insights.sbomify.com/CVE-2023-45559/): Information disclosure in n/a (high 8.2)
- [CVE-2023-43305](https://insights.sbomify.com/CVE-2023-43305/): Information disclosure in n/a (high 8.2)
- [CVE-2023-43300](https://insights.sbomify.com/CVE-2023-43300/): Information disclosure in n/a (high 8.2)
- [CVE-2023-43301](https://insights.sbomify.com/CVE-2023-43301/): Code injection in n/a (high 8.2)
- [CVE-2023-43302](https://insights.sbomify.com/CVE-2023-43302/): Information disclosure in n/a (high 8.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-5554 and fix it if it is affected.

What it is: CVE-2023-5554 is a medium-severity vulnerability in Linecorp Line, published on 12 Oct 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-5554 in the wild and no public exploit code.

Affected product: Linecorp Line. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2023-5554/ (Markdown: https://insights.sbomify.com/CVE-2023-5554/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-5554
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-5554
- OSV: https://osv.dev/vulnerability/CVE-2023-5554

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-5554/
Summaries are generated and may contain mistakes; the official description above is the record.