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Vulnerability details: VCID-4g4a-pnsq-cqaw
Vulnerability ID VCID-4g4a-pnsq-cqaw
Aliases CVE-2019-11691
Summary A use-after-free vulnerability can occur when working with XMLHttpRequest (XHR) in an event loop, causing the XHR main thread to be called after it has been freed. This results in a potentially exploitable crash.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-416 Use After Free
System Score Found at
cvssv3 9.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-11691.json
epss 0.00516 https://api.first.org/data/v1/epss?cve=CVE-2019-11691
epss 0.00516 https://api.first.org/data/v1/epss?cve=CVE-2019-11691
epss 0.00516 https://api.first.org/data/v1/epss?cve=CVE-2019-11691
epss 0.00516 https://api.first.org/data/v1/epss?cve=CVE-2019-11691
epss 0.00516 https://api.first.org/data/v1/epss?cve=CVE-2019-11691
epss 0.00516 https://api.first.org/data/v1/epss?cve=CVE-2019-11691
epss 0.00516 https://api.first.org/data/v1/epss?cve=CVE-2019-11691
epss 0.00516 https://api.first.org/data/v1/epss?cve=CVE-2019-11691
epss 0.00516 https://api.first.org/data/v1/epss?cve=CVE-2019-11691
epss 0.00516 https://api.first.org/data/v1/epss?cve=CVE-2019-11691
epss 0.00516 https://api.first.org/data/v1/epss?cve=CVE-2019-11691
epss 0.00516 https://api.first.org/data/v1/epss?cve=CVE-2019-11691
epss 0.00516 https://api.first.org/data/v1/epss?cve=CVE-2019-11691
epss 0.00516 https://api.first.org/data/v1/epss?cve=CVE-2019-11691
epss 0.00516 https://api.first.org/data/v1/epss?cve=CVE-2019-11691
epss 0.00516 https://api.first.org/data/v1/epss?cve=CVE-2019-11691
epss 0.00516 https://api.first.org/data/v1/epss?cve=CVE-2019-11691
epss 0.00516 https://api.first.org/data/v1/epss?cve=CVE-2019-11691
cvssv3.1 7.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 7.5 https://nvd.nist.gov/vuln/detail/CVE-2019-11691
cvssv3 9.8 https://nvd.nist.gov/vuln/detail/CVE-2019-11691
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-2019-11691.json
https://api.first.org/data/v1/epss?cve=CVE-2019-11691
https://bugzilla.mozilla.org/show_bug.cgi?id=1542465
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/
1712617 https://bugzilla.redhat.com/show_bug.cgi?id=1712617
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-2019-11691 https://nvd.nist.gov/vuln/detail/CVE-2019-11691
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-2019-11691.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:L/Au:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2019-11691
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-2019-11691
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 0.65666
EPSS Score 0.00516
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:58.550267+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2019/mfsa2019-14.yml 37.0.0