# CVE-2020-4337: Open redirect in API Connect

> Attackers can trick the server into sending registration emails with malicious URLs, facilitating phishing attacks against users.

- **Severity:** Medium 6.5 (`CVSS:3.0/I:H/AV:N/PR:N/A:N/UI:R/AC:L/S:U/C:N/RC:C/E:U/RL:O`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 3 Sep 2020
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-3f78-8xp5-2p5j

## What is CVE-2020-4337?

CVE-2020-4337 is a medium-severity vulnerability in Ibm Api Connect, published on 3 Sep 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

IBM API Connect 2018.4.1.0 through 2018.4.1.12 could allow an attacker to launch phishing attacks by tricking the server to generate user registration emails that contain malicious URLs. IBM X-Force ID: 177933.

## Which versions are affected by CVE-2020-4337?

It affects 1 product.


Products: Ibm Api Connect.

## How do I fix CVE-2020-4337?

No fix has been published for CVE-2020-4337 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-4337 being exploited?

There is no known exploitation of CVE-2020-4337 in the wild and no public exploit code.

## Other vulnerabilities in Ibm Api Connect

- [CVE-2019-4202](https://insights.sbomify.com/CVE-2019-4202/): Command injection in API Connect (critical 10.0)
- [CVE-2025-13915](https://insights.sbomify.com/CVE-2025-13915/): Authentication bypass in IBM API Connect (critical 9.8)
- [CVE-2018-1469](https://insights.sbomify.com/CVE-2018-1469/): Command injection in API Connect (critical 9.8)
- [CVE-2026-9074](https://insights.sbomify.com/CVE-2026-9074/): IBM API Connect SQL Injection (critical 9.1)
- [CVE-2019-4008](https://insights.sbomify.com/CVE-2019-4008/): Information disclosure in API Connect (critical 9.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-4337 and fix it if it is affected.

What it is: CVE-2020-4337 is a medium-severity vulnerability in Ibm Api Connect, published on 3 Sep 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2020-4337 in the wild and no public exploit code.

Affected product: Ibm Api Connect. 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-2020-4337/ (Markdown: https://insights.sbomify.com/CVE-2020-4337/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-4337
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-4337
- OSV: https://osv.dev/vulnerability/CVE-2020-4337

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-4337/
Summaries are generated and may contain mistakes; the official description above is the record.