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Noroxi
NVD / CVE Program· CNA mitre

CVE-2020-14093: Mutt before 1.14.3 allows an IMAP fcc/postpone man-in-the-middle attack via a PREAUTH response.

Noroxi assessment

Priority: Monitor (action score 24/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 2.1% (FIRST EPSS); higher than 82.1% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: mutt (Alpine:v3.12) 1.14.4-r0; mutt (Debian:10) 1.10.1-2.1+deb10u2; neomutt (Debian:10) 20180716+dfsg.1-1+deb10u1.

Low priority for now. Upgrade to mutt (Alpine:v3.12) 1.14.4-r0; mutt (Debian:10) 1.10.1-2.1+deb10u2; neomutt (Debian:10) 20180716+dfsg.1-1+deb10u1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

MediumCVSS 5.9 · v3.1—No exploit Fix available
Published
Jun 15, 2020
Updated
Jun 16, 2026
EPSS
2.1% · 82th percentile

Report tools

JSON

Action score

24

Monitor

Low priority for now.

CVSS
23 / 40 · 5.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
muttmutt
canonicalubuntu linux
debiandebian linux
opensuseleap

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This vulnerability is about certificate validation or weak cryptography. The free SSL checker tests your certificate, enabled TLS versions and weak ciphers.

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Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • canonical ubuntu linux12.04
  • canonical ubuntu linux16.04
  • canonical ubuntu linux18.04
  • canonical ubuntu linux19.10
  • canonical ubuntu linux20.04
  • debian debian linux10.0
  • debian debian linux8.0
  • debian debian linux9.0
  • mutt muttbefore 1.14.3
  • opensuse leap15.1
  • opensuse leap15.2

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.12muttbefore 1.14.4-r01.14.4-r0
Debian:10muttbefore 1.10.1-2.1+deb10u21.10.1-2.1+deb10u2
Debian:10neomuttbefore 20180716+dfsg.1-1+deb10u120180716+dfsg.1-1+deb10u1
Debian:12muttbefore 1.14.3-11.14.3-1
Debian:12neomuttbefore 20200619+dfsg.1-120200619+dfsg.1-1
Debian:8muttbefore 1.5.23-3+deb8u31.5.23-3+deb8u3
Debian:8muttbefore 1.5.23-3+deb8u21.5.23-3+deb8u2
Debian:9muttbefore 1.7.2-1+deb9u31.7.2-1+deb9u3
openSUSE:Leap 15.1muttbefore 1.10.1-lp151.2.3.11.10.1-lp151.2.3.1
openSUSE:Leap 15.1neomuttbefore 20201120-lp152.2.3.120201120-lp152.2.3.1
openSUSE:Leap 15.2muttbefore 1.10.1-lp152.3.3.11.10.1-lp152.3.3.1
openSUSE:Tumbleweedmuttbefore 2.0.7-2.22.0.7-2.2
openSUSE:Tumbleweedneomuttbefore 20210205-3.320210205-3.3
SUSE:HPE Helion OpenStack 8muttbefore 1.10.1-55.11.11.10.1-55.11.1
SUSE:Linux Enterprise Module for Basesystem 15 SP1muttbefore 1.10.1-3.8.11.10.1-3.8.1
SUSE:Linux Enterprise Point of Sale 11 SP3muttbefore 1.5.17-42.51.11.5.17-42.51.1
SUSE:Package Hub 15 SP1neomuttbefore 20201120-bp151.3.3.120201120-bp151.3.3.1
SUSE:Package Hub 15 SP2neomuttbefore 20201120-bp152.2.3.120201120-bp152.2.3.1

Same product

mutt: all records

Other highest-scoring records for the same primary product.

  • CVE-2018-14354An issue was discovered in Mutt before 1.10.1 and NeoMutt before 2018-07-16.
    41Plan
  • CVE-2018-14362An issue was discovered in Mutt before 1.10.1 and NeoMutt before 2018-07-16.
    40Plan
  • CVE-2018-14359An issue was discovered in Mutt before 1.10.1 and NeoMutt before 2018-07-16.
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2018-14358Jul 17, 2018 · An issue was discovered in Mutt before 1.10.1 and NeoMutt before 2018-07-16.
    40Plan
  • ← EarlierCVE-2005-2351Nov 1, 2019 · Mutt before 1.5.20 patch 7 allows an attacker to cause a denial of service via a series of requests to mutt temporary files.
    22Monitor
  • Later →CVE-2020-14154Jun 15, 2020 · Mutt before 1.14.3 proceeds with a connection even if, in response to a GnuTLS certificate prompt, the user rejects an expired intermediate
    19Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:mutt1.14.4-r0 · Alpine:v3.12Package registry (OSV)
debian:mutt1.14.3-1 · Debian:12Package registry (OSV)
debian:neomutt20200619+dfsg.1-1 · Debian:12Package registry (OSV)
opensuse:mutt1.10.1-lp151.2.3.1 · openSUSE:Leap 15.1Package registry (OSV)
opensuse:neomutt20201120-lp152.2.3.1 · openSUSE:Leap 15.1Package registry (OSV)
suse:mutt1.5.17-42.51.1 · SUSE:Linux Enterprise Point of Sale 11 SP3Package registry (OSV)
suse:neomutt20201120-bp151.3.3.1 · SUSE:Package Hub 15 SP1Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-319 · Cleartext Transmission of Sensitive Information

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (10 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records