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Vulnerability details: VCID-zbp4-8dcj-guf5
Vulnerability ID VCID-zbp4-8dcj-guf5
Aliases CVE-2019-9800
Summary Mozilla developers and community members Olli Pettay, Bogdan Tara, Jan de Mooij, Jason Kratzer, Jan Varga, Gary Kwong, Tim Guan-tin Chien, Tyson Smith, Ronald Crane, and Ted Campbell reported memory safety bugs present in Firefox 66 and Firefox ESR 60.6. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-787 Out-of-bounds Write
CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
System Score Found at
cvssv3 9.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-9800.json
epss 0.00554 https://api.first.org/data/v1/epss?cve=CVE-2019-9800
epss 0.00554 https://api.first.org/data/v1/epss?cve=CVE-2019-9800
epss 0.00554 https://api.first.org/data/v1/epss?cve=CVE-2019-9800
epss 0.00554 https://api.first.org/data/v1/epss?cve=CVE-2019-9800
epss 0.00554 https://api.first.org/data/v1/epss?cve=CVE-2019-9800
epss 0.00554 https://api.first.org/data/v1/epss?cve=CVE-2019-9800
epss 0.00554 https://api.first.org/data/v1/epss?cve=CVE-2019-9800
epss 0.00554 https://api.first.org/data/v1/epss?cve=CVE-2019-9800
epss 0.00554 https://api.first.org/data/v1/epss?cve=CVE-2019-9800
epss 0.00554 https://api.first.org/data/v1/epss?cve=CVE-2019-9800
epss 0.00554 https://api.first.org/data/v1/epss?cve=CVE-2019-9800
epss 0.00554 https://api.first.org/data/v1/epss?cve=CVE-2019-9800
epss 0.00554 https://api.first.org/data/v1/epss?cve=CVE-2019-9800
epss 0.00554 https://api.first.org/data/v1/epss?cve=CVE-2019-9800
epss 0.00554 https://api.first.org/data/v1/epss?cve=CVE-2019-9800
epss 0.00554 https://api.first.org/data/v1/epss?cve=CVE-2019-9800
cvssv3.1 8.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 7.5 https://nvd.nist.gov/vuln/detail/CVE-2019-9800
cvssv3 9.8 https://nvd.nist.gov/vuln/detail/CVE-2019-9800
archlinux Critical https://security.archlinux.org/AVG-965
archlinux Critical https://security.archlinux.org/AVG-966
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2019-13
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2019-14
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2019-15
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-9800.json
https://api.first.org/data/v1/epss?cve=CVE-2019-9800
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1540166%2C1534593%2C1546327%2C1540136%2C1538736%2C1538042%2C1535612%2C1499719%2C1499108%2C1538619%2C1535194%2C1516325%2C1542324%2C1542097%2C1532465%2C1533554%2C1541580
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-18511
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11691
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11692
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11693
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11698
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-5798
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-7317
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9797
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9800
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9816
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9817
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9819
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9820
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://www.mozilla.org/security/advisories/mfsa2019-13/
https://www.mozilla.org/security/advisories/mfsa2019-14/
https://www.mozilla.org/security/advisories/mfsa2019-15/
1712623 https://bugzilla.redhat.com/show_bug.cgi?id=1712623
ASA-201905-8 https://security.archlinux.org/ASA-201905-8
ASA-201905-9 https://security.archlinux.org/ASA-201905-9
AVG-965 https://security.archlinux.org/AVG-965
AVG-966 https://security.archlinux.org/AVG-966
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
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-2019-9800 https://nvd.nist.gov/vuln/detail/CVE-2019-9800
mfsa2019-13 https://www.mozilla.org/en-US/security/advisories/mfsa2019-13
mfsa2019-14 https://www.mozilla.org/en-US/security/advisories/mfsa2019-14
mfsa2019-15 https://www.mozilla.org/en-US/security/advisories/mfsa2019-15
USN-3991-1 https://usn.ubuntu.com/3991-1/
USN-3997-1 https://usn.ubuntu.com/3997-1/
No exploits are available.
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-2019-9800.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: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-2019-9800
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:3.0/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-2019-9800
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 0.67068
EPSS Score 0.00554
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:58.723084+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2019/mfsa2019-14.yml 37.0.0