CVE-2020-3811

Name: CVE-2020-3811
Creator: NVD / NIST
Published: 2020-05-26T13:15:10.687+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.77%

Last modified Jun 17, 2026

CVE-2020-3811 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. qmail-verify as used in netqmail 1.06 is prone to a mail-address verification bypass vulnerability.. EPSS estimates a 1.77% chance of exploitation in the next 30 days.

Description

qmail-verify as used in netqmail 1.06 is prone to a mail-address verification bypass vulnerability.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS Probability

1.77%

75.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Netqmail	Netqmail	1.06
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0
Canonical	Ubuntu Linux	20.04

References

https://bugs.debian.org/961060Issue Tracking, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/06/msg00002.htmlMailing List, Third Party Advisory
https://usn.ubuntu.com/4556-1/Third Party Advisory
https://www.debian.org/security/2020/dsa-4692Third Party Advisory
https://www.openwall.com/lists/oss-security/2020/05/19/8Exploit, Mailing List, Patch, Third Party Advisory
https://bugs.debian.org/961060Issue Tracking, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/06/msg00002.htmlMailing List, Third Party Advisory
https://usn.ubuntu.com/4556-1/Third Party Advisory
https://www.debian.org/security/2020/dsa-4692Third Party Advisory
https://www.openwall.com/lists/oss-security/2020/05/19/8Exploit, Mailing List, Patch, Third Party Advisory

Timeline

Published: May 26, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-3811?

qmail-verify as used in netqmail 1.06 is prone to a mail-address verification bypass vulnerability.

How severe is CVE-2020-3811?

CVE-2020-3811 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.77% probability of exploitation in the next 30 days.

How do I fix CVE-2020-3811?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-3811?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST