CVE-2020-3811
qmail-verify as used in netqmail 1.06 is prone to a mail-address verification bypass vulnerability.
qmail-verify as used in netqmail 1.06 is prone to a mail-address verification bypass vulnerability.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
qmail-verify as used in netqmail 1.06 is prone to a mail-address verification bypass vulnerability.
- Record
CVE-2020-3811- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:P/A:N - Weakness
- CWE-665, CWE-863
- Updated
- 2026-11-02
CVE List No score
qmail-verify as used in netqmail 1.06 is prone to a mail-address verification bypass vulnerability.
- Record
CVE-2020-3811- Updated
- 2026-11-02
EUVDEUVD-2020-25076 No score
qmail-verify as used in netqmail 1.06 is prone to a mail-address verification bypass vulnerability.
- Record
EUVD-2020-25076- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-w7qp-9896-2fvp
qmail-verify as used in netqmail 1.06 is prone to a mail-address verification bypass vulnerability.
qmail-verify as used in netqmail 1.06 is prone to a mail-address verification bypass vulnerability.
- Record
GHSA-w7qp-9896-2fvp- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-20, CWE-665
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2020-3811
qmail-verify as used in netqmail 1.06 is prone to a mail-address verification bypass vulnerability.
- Record
UBUNTU-CVE-2020-3811- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
OSVUSN-4556-1 No score
netqmail vulnerabilities
It was discovered that netqmail did not properly handle certain input. Both remote and local attackers could use this vulnerability to cause netqmail to crash or execute arbitrary code. (CVE-2005-1513, CVE-2005-1514, CVE-2005-1515)
It was discovered that netqmail did not properly handle certain input when validating email addresses. An attacker could use this to bypass email address validation. (CVE-2020-3811)
It was discovered that netqmail did not properly handle certain input when validating email addresses. An attacker could use this vulnerability to cause netqmail to disclose sensitive information. (CVE-2020-3812)
- Record
USN-4556-1- Updated
- 2026-11-02
OSVUSN-4621-1 No score
netqmail vulnerabilities
It was discovered that netqmail did not properly handle certain input. Both remote and local attackers could use this vulnerability to cause netqmail to crash or execute arbitrary code. (CVE-2005-1513, CVE-2005-1514, CVE-2005-1515)
It was discovered that netqmail did not properly handle certain input when validating email addresses. An attacker could use this to bypass email address validation. (CVE-2020-3811)
It was discovered that netqmail did not properly handle certain input when validating email addresses. An attacker could use this vulnerability to cause netqmail to disclose sensitive information. (CVE-2020-3812)
- Record
USN-4621-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
netqmailDebian:8 From an advisory covering 5 CVEs |
before 1.06-6.2~deb8u1, plus listed versions 1.06-51.06-61.06-6.1 |
1.06-6.2~deb8u1 |
netqmailDebian:9 From an advisory covering 5 CVEs |
before 1.06-6.2~deb9u1, plus listed versions 1.06-61.06-6.11.06-6.2~deb8u1 |
1.06-6.2~deb9u1 |
netqmailDebian:10 From an advisory covering 5 CVEs |
before 1.06-6.2~deb10u1, plus listed versions 1.06-61.06-6.11.06-6.2~deb8u11.06-6.2~deb9u1 |
1.06-6.2~deb10u1 |
netqmailUbuntu:Pro:14.04:LTS |
before 1.06-6.2~deb10u1build0.14.04.1+esm1, plus listed versions 1.06-5 |
1.06-6.2~deb10u1build0.14.04.1+esm1 |
netqmailUbuntu:16.04:LTS |
before 1.06-6.2~deb10u1build0.16.04.1, plus listed versions 1.06-5 |
1.06-6.2~deb10u1build0.16.04.1 |
netqmailUbuntu:18.04:LTS |
before 1.06-6.2~deb10u1build0.18.04.1, plus listed versions 1.06-6 |
1.06-6.2~deb10u1build0.18.04.1 |
netqmailUbuntu:20.04:LTS |
before 1.06-6.2~deb10u1build0.20.04.1, plus listed versions 1.06-6.1 |
1.06-6.2~deb10u1build0.20.04.1 |
netqmailUbuntu:20.04:LTS From an advisory covering 5 CVEs |
before 1.06-6.2~deb10u1build0.20.04.1, plus listed versions 1.06-6.1 |
1.06-6.2~deb10u1build0.20.04.1 |
netqmailUbuntu:16.04:LTS From an advisory covering 5 CVEs |
before 1.06-6.2~deb10u1build0.16.04.1, plus listed versions 1.06-5 |
1.06-6.2~deb10u1build0.16.04.1 |
netqmailUbuntu:18.04:LTS From an advisory covering 5 CVEs |
before 1.06-6.2~deb10u1build0.18.04.1, plus listed versions 1.06-6 |
1.06-6.2~deb10u1build0.18.04.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-3811 is a high vulnerability (CVSS 7.5) in Debian Netqmail, published May 24, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.81%, the 78th percentile. Fixed in netqmail 1.06-6.2~deb10u1build0.14.04.1+esm1.
References
openwall.com/lists/oss-security/2020/05/19/8
bugs.debian.org/961060
debian.org/security/2020/dsa-4692
lists.debian.org/debian-lts-announce/2020/06/msg00002.html
usn.ubuntu.com/4556-1
nvd.nist.gov/vuln/detail/CVE-2020-3811
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github.com/advisories/GHSA-w7qp-9896-2fvp
ubuntu.com/security/CVE-2020-3811
cve.org/CVERecord?id=CVE-2020-3811