# CVE-2021-32066: Security feature bypass in n/a

> Man-in-the-middle attackers can bypass TLS encryption in Ruby's Net::IMAP by stripping the StartTLS command, exposing email data.

- **Severity:** High 7.4 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 1 Aug 2021
- **Updated:** 3 Aug 2024
- **Also known as:** ALPINE-CVE-2021-32066, AZL-6861, BIT-ruby-2021-32066, BIT-ruby-min-2021-32066, CLEANSTART-2026-SH27100, DEBIAN-CVE-2021-32066, GHSA-gx49-h5r3-q3xj, JLSEC-2026-1285, UBUNTU-CVE-2021-32066

## What is CVE-2021-32066?

CVE-2021-32066 is a high-severity vulnerability in Oracle Jd Edwards Enterpriseone Tools, published on 1 Aug 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered in Ruby through 2.6.7, 2.7.x through 2.7.3, and 3.x through 3.0.1. Net::IMAP does not raise an exception when StartTLS fails with an an unknown response, which might allow man-in-the-middle attackers to bypass the TLS protections by leveraging a network position between the client and the registry to block the StartTLS command, aka a "StartTLS stripping attack."

Weakness: CWE-755 (Improper Handling of Exceptional Conditions)

## Which versions are affected by CVE-2021-32066?

2 open source packages ship an affected version, including ruby and ruby-min. It affects 2 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `ruby` | Bitnami | From 2.6.0 | 2.6.8, 2.7.4, 3.0.2 |
| `ruby-min` | Bitnami | From 2.6.0 | 2.6.8, 2.7.4, 3.0.2 |

Products: Oracle Jd Edwards Enterpriseone Tools, Ruby-Lang Ruby.

## How do I fix CVE-2021-32066?

Upgrade ruby to a fixed version for your release line: 2.6.8, 2.7.4 or 3.0.2.

## Is CVE-2021-32066 being exploited?

There is no known exploitation of CVE-2021-32066 in the wild and no public exploit code.

## Other vulnerabilities in Oracle Jd Edwards Enterpriseone Tools

- [CVE-2026-60627](https://insights.sbomify.com/CVE-2026-60627/): Auth bypass in JD Edwards EnterpriseOne Tools (critical 9.9)
- [CVE-2026-61272](https://insights.sbomify.com/CVE-2026-61272/): Auth bypass in JD Edwards EnterpriseOne Tools (critical 9.8)
- [CVE-2026-46878](https://insights.sbomify.com/CVE-2026-46878/): Auth bypass in JD Edwards EnterpriseOne Tools (critical 9.8)
- [CVE-2026-46879](https://insights.sbomify.com/CVE-2026-46879/): Auth bypass in JD Edwards EnterpriseOne Tools (critical 9.8)
- [CVE-2026-46880](https://insights.sbomify.com/CVE-2026-46880/): Auth bypass in JD Edwards EnterpriseOne Tools (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-32066 and fix it if it is affected.

What it is: CVE-2021-32066 is a high-severity vulnerability in Oracle Jd Edwards Enterpriseone Tools, published on 1 Aug 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-2021-32066 in the wild and no public exploit code.

Affected packages and fixed versions:
- ruby (Bitnami): affected from 2.6.0; fixed in 2.6.8, 2.7.4, 3.0.2
- ruby-min (Bitnami): affected from 2.6.0; fixed in 2.6.8, 2.7.4, 3.0.2

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-2021-32066/ (Markdown: https://insights.sbomify.com/CVE-2021-32066/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-32066
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-32066
- OSV: https://osv.dev/vulnerability/CVE-2021-32066

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-32066/
Summaries are generated and may contain mistakes; the official description above is the record.