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Vulnerability details: VCID-m5h6-y3tw-eue6
Vulnerability ID VCID-m5h6-y3tw-eue6
Aliases CVE-2019-20503
Summary Multiple vulnerabilities have been found in Mozilla Thunderbird, the worst of which could result in the arbitrary execution of code.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-125 Out-of-bounds Read
System Score Found at
cvssv3 6.1 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-20503.json
epss 0.02474 https://api.first.org/data/v1/epss?cve=CVE-2019-20503
epss 0.02474 https://api.first.org/data/v1/epss?cve=CVE-2019-20503
epss 0.02474 https://api.first.org/data/v1/epss?cve=CVE-2019-20503
epss 0.02474 https://api.first.org/data/v1/epss?cve=CVE-2019-20503
epss 0.02474 https://api.first.org/data/v1/epss?cve=CVE-2019-20503
epss 0.02474 https://api.first.org/data/v1/epss?cve=CVE-2019-20503
epss 0.02474 https://api.first.org/data/v1/epss?cve=CVE-2019-20503
epss 0.02474 https://api.first.org/data/v1/epss?cve=CVE-2019-20503
epss 0.02474 https://api.first.org/data/v1/epss?cve=CVE-2019-20503
epss 0.02474 https://api.first.org/data/v1/epss?cve=CVE-2019-20503
epss 0.02474 https://api.first.org/data/v1/epss?cve=CVE-2019-20503
epss 0.02474 https://api.first.org/data/v1/epss?cve=CVE-2019-20503
epss 0.02474 https://api.first.org/data/v1/epss?cve=CVE-2019-20503
epss 0.02474 https://api.first.org/data/v1/epss?cve=CVE-2019-20503
epss 0.02474 https://api.first.org/data/v1/epss?cve=CVE-2019-20503
epss 0.02474 https://api.first.org/data/v1/epss?cve=CVE-2019-20503
cvssv3.1 6.1 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
archlinux Critical https://security.archlinux.org/AVG-1112
archlinux Critical https://security.archlinux.org/AVG-1115
archlinux High https://security.archlinux.org/AVG-1118
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-08
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-09
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-10
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-20503.json
https://api.first.org/data/v1/epss?cve=CVE-2019-20503
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-20503
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6422
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6424
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6425
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6426
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6427
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6428
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6429
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6449
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6805
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6806
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6807
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6811
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6812
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6814
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
1812203 https://bugzilla.redhat.com/show_bug.cgi?id=1812203
953270 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=953270
ASA-202003-11 https://security.archlinux.org/ASA-202003-11
ASA-202003-12 https://security.archlinux.org/ASA-202003-12
ASA-202003-8 https://security.archlinux.org/ASA-202003-8
AVG-1112 https://security.archlinux.org/AVG-1112
AVG-1115 https://security.archlinux.org/AVG-1115
AVG-1118 https://security.archlinux.org/AVG-1118
GLSA-202003-02 https://security.gentoo.org/glsa/202003-02
GLSA-202003-10 https://security.gentoo.org/glsa/202003-10
mfsa2020-08 https://www.mozilla.org/en-US/security/advisories/mfsa2020-08
mfsa2020-09 https://www.mozilla.org/en-US/security/advisories/mfsa2020-09
mfsa2020-10 https://www.mozilla.org/en-US/security/advisories/mfsa2020-10
RHSA-2020:0815 https://access.redhat.com/errata/RHSA-2020:0815
RHSA-2020:0816 https://access.redhat.com/errata/RHSA-2020:0816
RHSA-2020:0819 https://access.redhat.com/errata/RHSA-2020:0819
RHSA-2020:0820 https://access.redhat.com/errata/RHSA-2020:0820
RHSA-2020:0905 https://access.redhat.com/errata/RHSA-2020:0905
RHSA-2020:0914 https://access.redhat.com/errata/RHSA-2020:0914
RHSA-2020:0918 https://access.redhat.com/errata/RHSA-2020:0918
RHSA-2020:0919 https://access.redhat.com/errata/RHSA-2020:0919
RHSA-2020:1270 https://access.redhat.com/errata/RHSA-2020:1270
USN-4299-1 https://usn.ubuntu.com/4299-1/
USN-4328-1 https://usn.ubuntu.com/4328-1/
USN-4335-1 https://usn.ubuntu.com/4335-1/
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-20503.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:L/PR:N/UI:R/S:C/C:L/I:L/A:N 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
Exploit Prediction Scoring System (EPSS)
Percentile 0.85205
EPSS Score 0.02474
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:58:45.091585+00:00 Gentoo Importer Import https://security.gentoo.org/glsa/202003-10 38.0.0