Executive Summary

Title OpenSMTPD vulnerability
Name USN-4268-1 First vendor Publication 2020-02-05
Vendor Ubuntu Last vendor Modification 2020-02-05
Severity (Vendor) N/A Revision N/A

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Overall CVSS Score 9.8
Base Score 9.8 Environmental Score 9.8
impact SubScore 5.9 Temporal Score 9.8
Exploitabality Sub Score 3.9
Attack Vector Network Attack Complexity Low
Privileges Required None User Interaction None
Scope Unchanged Confidentiality Impact High
Integrity Impact High Availability Impact High
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:C/I:C/A:C)
Cvss Base Score 10 Attack Range Network
Cvss Impact Score 10 Attack Complexity Low
Cvss Expoit Score 10 Authentication None Required
Calculate full CVSS 2.0 Vectors scores


A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 19.10 - Ubuntu 18.04 LTS


OpenSMTPD could be made to run programs as root if it received specially crafted input over the network.

Software Description: - opensmtpd: secure, reliable, lean, and easy-to configure SMTP server


It was discovered that OpenSMTPD incorrectly verified the sender's or receiver's e-mail addresses under certain conditions. An attacker could use this vulnerability to execute arbitrary commands as root.

Update instructions:

The problem can be corrected by updating your system to the following package versions:

Ubuntu 19.10:
opensmtpd 6.0.3p1-6ubuntu0.1

Ubuntu 18.04 LTS:
opensmtpd 6.0.3p1-1ubuntu0.1

In general, a standard system update will make all the necessary changes.


Package Information:

Original Source

Url : http://www.ubuntu.com/usn/USN-4268-1

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-252 Unchecked Return Value

CPE : Common Platform Enumeration

Application 1
Os 2

SAINT Exploits

Description Link
OpenSMTPD MAIL FROM command injection More info here

Snort® IPS/IDS

Date Description
2020-04-14 OpenSMTPD smtp_mailaddr command injection attempt
RuleID : 53432 - Revision : 1 - Type : SERVER-MAIL
2020-04-14 OpenSMTPD smtp_mailaddr command injection attempt
RuleID : 53431 - Revision : 1 - Type : SERVER-MAIL

Alert History

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Date Informations
2020-05-23 13:03:46
  • Multiple Updates
2020-02-05 17:17:53
  • First insertion