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Vulnerability details: VCID-thn8-d2yg-6kgw
Vulnerability ID VCID-thn8-d2yg-6kgw
Aliases CVE-2020-15646
Summary If an attacker intercepts Thunderbird's initial attempt to perform automatic account setup using the Microsoft Exchange autodiscovery mechanism, and the attacker sends a crafted response, then Thunderbird sends username and password over https to a server controlled by the attacker.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
System Score Found at
cvssv3 5.9 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-15646.json
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-15646
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-15646
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-15646
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-15646
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-15646
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-15646
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-15646
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-15646
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-15646
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-15646
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-15646
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-15646
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-15646
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-15646
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-15646
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-15646
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-15646
cvssv3.1 7.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2020-15646
cvssv3.1 5.9 https://nvd.nist.gov/vuln/detail/CVE-2020-15646
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-26
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-15646.json
https://api.first.org/data/v1/epss?cve=CVE-2020-15646
https://bugzilla.mozilla.org/show_bug.cgi?id=1606610
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12417
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12418
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12419
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12420
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12421
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15646
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://www.mozilla.org/security/advisories/mfsa2020-26/
1854036 https://bugzilla.redhat.com/show_bug.cgi?id=1854036
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:*:*:*:*:*:*:*:*
CVE-2020-15646 https://nvd.nist.gov/vuln/detail/CVE-2020-15646
mfsa2020-26 https://www.mozilla.org/en-US/security/advisories/mfsa2020-26
RHSA-2020:2906 https://access.redhat.com/errata/RHSA-2020:2906
RHSA-2020:2907 https://access.redhat.com/errata/RHSA-2020:2907
RHSA-2020:2966 https://access.redhat.com/errata/RHSA-2020:2966
RHSA-2020:3038 https://access.redhat.com/errata/RHSA-2020:3038
RHSA-2020:3046 https://access.redhat.com/errata/RHSA-2020:3046
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-15646.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: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
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-2020-15646
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:H/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-15646
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 0.48623
EPSS Score 0.00254
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:44.046477+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2020/mfsa2020-26.yml 37.0.0