# CVE-2021-27189: Security feature bypass in n/a

> The CIRA Canadian Shield iOS app fails to validate SSL certificates, allowing attackers to intercept traffic via man-in-the-middle attacks.

- **Severity:** Medium 5.9 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/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:** 22 Feb 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-fpr2-m5hr-2pmm

## What is CVE-2021-27189?

CVE-2021-27189 is a medium-severity vulnerability in n/a, published on 22 Feb 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The CIRA Canadian Shield app before 4.0.13 for iOS lacks SSL Certificate Validation.

Weakness: CWE-295 (Improper Certificate Validation)

## Which versions are affected by CVE-2021-27189?

It affects 1 product.


Products: Cira Canadian Shield.

## How do I fix CVE-2021-27189?

No fix has been published for CVE-2021-27189 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-27189 being exploited?

There is no known exploitation of CVE-2021-27189 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-27189 and fix it if it is affected.

What it is: CVE-2021-27189 is a medium-severity vulnerability in n/a, published on 22 Feb 2021. 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-2021-27189 in the wild and no public exploit code.

Affected product: n/a. 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-2021-27189/ (Markdown: https://insights.sbomify.com/CVE-2021-27189/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-27189
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-27189
- OSV: https://osv.dev/vulnerability/CVE-2021-27189

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-27189/
Summaries are generated and may contain mistakes; the official description above is the record.