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Vulnerability details: VCID-2qnc-cp2j-9kez
Vulnerability ID VCID-2qnc-cp2j-9kez
Aliases CVE-2020-12398
Summary If Thunderbird is configured to use STARTTLS for an IMAP server, and the server sends a PREAUTH response, then Thunderbird will continue with an unencrypted connection, causing email data to be sent without protection.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-319 Cleartext Transmission of Sensitive Information
CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
System Score Found at
cvssv3 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-12398.json
epss 0.00245 https://api.first.org/data/v1/epss?cve=CVE-2020-12398
epss 0.00245 https://api.first.org/data/v1/epss?cve=CVE-2020-12398
epss 0.00245 https://api.first.org/data/v1/epss?cve=CVE-2020-12398
epss 0.00245 https://api.first.org/data/v1/epss?cve=CVE-2020-12398
epss 0.00245 https://api.first.org/data/v1/epss?cve=CVE-2020-12398
epss 0.00245 https://api.first.org/data/v1/epss?cve=CVE-2020-12398
epss 0.00245 https://api.first.org/data/v1/epss?cve=CVE-2020-12398
epss 0.00245 https://api.first.org/data/v1/epss?cve=CVE-2020-12398
epss 0.00245 https://api.first.org/data/v1/epss?cve=CVE-2020-12398
epss 0.00245 https://api.first.org/data/v1/epss?cve=CVE-2020-12398
epss 0.00245 https://api.first.org/data/v1/epss?cve=CVE-2020-12398
epss 0.00245 https://api.first.org/data/v1/epss?cve=CVE-2020-12398
epss 0.00245 https://api.first.org/data/v1/epss?cve=CVE-2020-12398
epss 0.00245 https://api.first.org/data/v1/epss?cve=CVE-2020-12398
epss 0.00245 https://api.first.org/data/v1/epss?cve=CVE-2020-12398
epss 0.00245 https://api.first.org/data/v1/epss?cve=CVE-2020-12398
epss 0.00245 https://api.first.org/data/v1/epss?cve=CVE-2020-12398
epss 0.00245 https://api.first.org/data/v1/epss?cve=CVE-2020-12398
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2020-12398
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2020-12398
archlinux High https://security.archlinux.org/AVG-1179
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-22
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-12398.json
https://api.first.org/data/v1/epss?cve=CVE-2020-12398
https://bugzilla.mozilla.org/show_bug.cgi?id=1613623
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12398
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12399
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12405
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12406
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12410
https://www.mozilla.org/security/advisories/mfsa2020-22/
1846556 https://bugzilla.redhat.com/show_bug.cgi?id=1846556
ASA-202006-4 https://security.archlinux.org/ASA-202006-4
AVG-1179 https://security.archlinux.org/AVG-1179
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*
CVE-2020-12398 https://nvd.nist.gov/vuln/detail/CVE-2020-12398
mfsa2020-22 https://www.mozilla.org/en-US/security/advisories/mfsa2020-22
RHSA-2020:2611 https://access.redhat.com/errata/RHSA-2020:2611
RHSA-2020:2613 https://access.redhat.com/errata/RHSA-2020:2613
RHSA-2020:2614 https://access.redhat.com/errata/RHSA-2020:2614
RHSA-2020:2615 https://access.redhat.com/errata/RHSA-2020:2615
RHSA-2020:2616 https://access.redhat.com/errata/RHSA-2020:2616
USN-4421-1 https://usn.ubuntu.com/4421-1/
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-12398.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:M/Au:N/C:P/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-12398
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-12398
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.47773
EPSS Score 0.00245
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:38.845741+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2020/mfsa2020-22.yml 37.0.0