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Vulnerability details: VCID-z22x-7rf4-rfha
Vulnerability ID VCID-z22x-7rf4-rfha
Aliases CVE-2019-11705
Summary A flaw in Thunderbird's implementation of iCal causes a stack buffer overflow in icalrecur_add_bydayrules when processing certain email messages, resulting in a potentially exploitable crash.
Status Published
Exploitability 2.0
Weighted Severity 8.8
Risk 10.0
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-787 Out-of-bounds Write
CWE-121 Stack-based Buffer Overflow
System Score Found at
cvssv3 9.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-11705.json
epss 0.08708 https://api.first.org/data/v1/epss?cve=CVE-2019-11705
epss 0.08708 https://api.first.org/data/v1/epss?cve=CVE-2019-11705
epss 0.08708 https://api.first.org/data/v1/epss?cve=CVE-2019-11705
epss 0.08708 https://api.first.org/data/v1/epss?cve=CVE-2019-11705
epss 0.08708 https://api.first.org/data/v1/epss?cve=CVE-2019-11705
epss 0.08708 https://api.first.org/data/v1/epss?cve=CVE-2019-11705
epss 0.08708 https://api.first.org/data/v1/epss?cve=CVE-2019-11705
epss 0.08708 https://api.first.org/data/v1/epss?cve=CVE-2019-11705
epss 0.08708 https://api.first.org/data/v1/epss?cve=CVE-2019-11705
epss 0.08708 https://api.first.org/data/v1/epss?cve=CVE-2019-11705
epss 0.08708 https://api.first.org/data/v1/epss?cve=CVE-2019-11705
epss 0.08708 https://api.first.org/data/v1/epss?cve=CVE-2019-11705
epss 0.08708 https://api.first.org/data/v1/epss?cve=CVE-2019-11705
epss 0.08708 https://api.first.org/data/v1/epss?cve=CVE-2019-11705
cvssv3 9.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 7.5 https://nvd.nist.gov/vuln/detail/CVE-2019-11705
cvssv3.1 9.8 https://nvd.nist.gov/vuln/detail/CVE-2019-11705
archlinux High https://security.archlinux.org/AVG-980
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2019-17
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-11705.json
https://api.first.org/data/v1/epss?cve=CVE-2019-11705
https://bugzilla.mozilla.org/show_bug.cgi?id=1553808
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11703
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11704
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11705
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11706
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://security.gentoo.org/glsa/201908-20
https://www.mozilla.org/security/advisories/mfsa2019-17/
1720008 https://bugzilla.redhat.com/show_bug.cgi?id=1720008
ASA-201906-10 https://security.archlinux.org/ASA-201906-10
AVG-980 https://security.archlinux.org/AVG-980
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-2019-11705 Exploit https://github.com/x41sec/advisories/tree/master/X41-2019-003
CVE-2019-11705 Exploit https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/multiple/dos/47004.txt
CVE-2019-11705 https://nvd.nist.gov/vuln/detail/CVE-2019-11705
mfsa2019-17 https://www.mozilla.org/en-US/security/advisories/mfsa2019-17
RHSA-2019:1623 https://access.redhat.com/errata/RHSA-2019:1623
RHSA-2019:1624 https://access.redhat.com/errata/RHSA-2019:1624
RHSA-2019:1626 https://access.redhat.com/errata/RHSA-2019:1626
USN-4028-1 https://usn.ubuntu.com/4028-1/
Data source Exploit-DB
Date added June 17, 2019
Description Thunderbird ESR < 60.7.XXX - 'icalrecur_add_bydayrules' Stack-Based Buffer Overflow
Ransomware campaign use Unknown
Source publication date June 17, 2019
Exploit type dos
Platform multiple
Source update date June 17, 2019
Source URL https://github.com/x41sec/advisories/tree/master/X41-2019-003
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-11705.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:3.0/AV:N/AC:L/PR:N/UI:N/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:L/Au:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2019-11705
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:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2019-11705
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 0.921
EPSS Score 0.08708
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:59.938911+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2019/mfsa2019-17.yml 37.0.0