What’s Vulnerable › Vulnerabilities

CVE-2021-27182

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-04-14 · updated 2026-06-17
• Weakness: CWE-74

Description

An issue was discovered in MDaemon before 20.0.4. There is an IFRAME injection vulnerability in Webmail (aka WorldClient). It can be exploited via an email message. It allows an attacker to perform any action with the privileges of the attacked user.

Affected products

• Altn Mdaemon: before 20.0.4 — fixed in 20.0.4

How to fix

Upgrade to a fixed version: Altn Mdaemon 20.0.4. Check the vendor advisory for mitigations.

References

• https://github.com/chudyPB/MDaemon-Advisories
• https://www.altn.com/Support/SecurityUpdate/MD011221_MDaemon_EN/
• https://github.com/chudyPB/MDaemon-Advisories
• https://www.altn.com/Support/SecurityUpdate/MD011221_MDaemon_EN/

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