CVE-2020-3811

Exp

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

Published: 2020-05-26 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-3811 is rated High Exploit Risk (72.6/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.77%). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +1.34% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2020-3811

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2020-3811

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.42% 1.77% +1.34%
2 2025-11-21 0.55% 0.42% -0.12%
3 2025-11-18 — 0.55% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-3811

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2020-3811

OS Trackers for CVE-2020-3811

vendor priority summary link
ubuntu medium CVE-2020-3811 medium priority: Ubuntu including 1 source packages (netqmail), 7 status rows across 7 suites (bionic, eoan, focal, groovy, trusty, upstream, xenial): released 5, DNE 1, ignored 1. https://ubuntu.com/security/CVE-2020-3811

Affected software / configurations for CVE-2020-3811

Vendor Product Version Raw CPE
netqmail netqmail 1.06 cpe:2.3:a:netqmail:netqmail:1.06:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
canonical ubuntu_linux 20.04 cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*

References for CVE-2020-3811

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