CVE & CISA-KEV Catalog

CVE-2020-28896

MEDIUMEPSS 82th pctl
5.3
CVSS v3
NVD

Description

Mutt before 2.0.2 and NeoMutt before 2020-11-20 did not ensure that $ssl_force_tls was processed if an IMAP server's initial server response was invalid. The connection was not properly closed, and the code could continue attempting to authenticate. This could result in authentication credentials being exposed on an unencrypted connection, or to a machine-in-the-middle.

CWE-287Improper AuthenticationCWE-755

How to fix

Remediation Available
muttDebian
Fixed in:2.0.2-1CVE-2020-28896
Fixed in:2.0.2-1CVE-2020-28896
Fixed in:2.0.2-1CVE-2020-28896
Fixed in:2.0.2-1CVE-2020-28896
muttUbuntu
Fixed in:1.5.24-1ubuntu0.5USN-4645-1
Fixed in:1.9.4-3ubuntu0.4USN-4645-1
Fixed in:1.13.2-1ubuntu0.3USN-4645-1
neomuttUbuntu
Fixed in:20171215+dfsg.1-1ubuntu0.1~esm1USN-7204-1
Fixed in:20191207+dfsg.1-1.1ubuntu0.1~esm1USN-7204-1
Fixed in:20211029+dfsg1-1ubuntu0.1~esm1USN-7204-1
Fixed in:20231103+dfsg1-1ubuntu0.1~esm1USN-7204-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityHigh
Privileges RequiredNone
User InteractionRequired
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityNone
AvailabilityNone

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

Exploit Intelligence

2.32%probability of exploitation in 30 days
82ndpercentile

Elevated risk: more likely to be exploited than 82% of all known CVEs.

References

Related Vulnerabilities

Other CWE-287 (Improper Authentication) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2023-35082Critical9.8100%KEV + RansomFix
CVE-2023-35078Critical9.8100%KEV + RansomFix
CVE-2017-7921Critical9.8100%KEV-
CVE-2024-7593Critical9.8100%KEV-
CVE-2023-46805High8.2100%KEV + Ransom-
CVE-2022-40684Critical9.8100%KEV + RansomFix

Common questions

How do I fix CVE-2020-28896?

Published advisories record a fix for 3 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2020-28896 being actively exploited?

Not that we know of. CVE-2020-28896 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 2.3% is the estimated probability that it will be exploited in the next 30 days. That is higher than 82% of all scored CVEs.

How severe is CVE-2020-28896?

CVE-2020-28896 has a CVSS v3 base score of 5.3, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2020-28896 affect?

Published advisories record a fix for mutt (Debian), mutt (Ubuntu), neomutt (Ubuntu). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.