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Vulnerability details: VCID-t4kk-v8hz-aaac
Vulnerability ID VCID-t4kk-v8hz-aaac
Aliases CVE-2019-11756
Summary Improper refcounting of soft token session objects could cause a use-after-free and crash (likely limited to a denial of service). This vulnerability affects Firefox < 71.
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
generic_textual Medium http://people.canonical.com/~ubuntu-security/cve/2019/CVE-2019-11756.html
rhas Moderate https://access.redhat.com/errata/RHSA-2020:3280
rhas Moderate https://access.redhat.com/errata/RHSA-2020:4076
rhas Moderate https://access.redhat.com/errata/RHSA-2021:0758
rhas Moderate https://access.redhat.com/errata/RHSA-2021:0876
rhas Moderate https://access.redhat.com/errata/RHSA-2021:1026
cvssv3 7.1 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-11756.json
epss 0.0021 https://api.first.org/data/v1/epss?cve=CVE-2019-11756
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epss 0.00216 https://api.first.org/data/v1/epss?cve=CVE-2019-11756
epss 0.00635 https://api.first.org/data/v1/epss?cve=CVE-2019-11756
rhbs medium https://bugzilla.redhat.com/show_bug.cgi?id=1774835
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11756
cvssv2 6.8 https://nvd.nist.gov/vuln/detail/CVE-2019-11756
cvssv3 8.8 https://nvd.nist.gov/vuln/detail/CVE-2019-11756
cvssv3.1 8.8 https://nvd.nist.gov/vuln/detail/CVE-2019-11756
archlinux Critical https://security.archlinux.org/AVG-1071
generic_textual Medium https://ubuntu.com/security/notices/USN-4216-1
generic_textual Medium https://ubuntu.com/security/notices/USN-4216-2
generic_textual Medium https://usn.ubuntu.com/usn/usn-4216-1
generic_textual Medium https://usn.ubuntu.com/usn/usn-4216-2
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2019-36
generic_textual Medium https://www.mozilla.org/en-US/security/advisories/mfsa2019-36/#CVE-2019-11756
Reference id Reference type URL
http://people.canonical.com/~ubuntu-security/cve/2019/CVE-2019-11756.html
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-11756.json
https://api.first.org/data/v1/epss?cve=CVE-2019-11756
https://bugzilla.mozilla.org/show_bug.cgi?id=1508776
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11756
https://ubuntu.com/security/notices/USN-4216-1
https://ubuntu.com/security/notices/USN-4216-2
https://usn.ubuntu.com/usn/usn-4216-1
https://usn.ubuntu.com/usn/usn-4216-2
https://www.mozilla.org/en-US/security/advisories/mfsa2019-36/#CVE-2019-11756
https://www.mozilla.org/security/advisories/mfsa2019-36/
1774835 https://bugzilla.redhat.com/show_bug.cgi?id=1774835
ASA-201912-1 https://security.archlinux.org/ASA-201912-1
AVG-1071 https://security.archlinux.org/AVG-1071
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:*:*:*:*:*:*:*:*
CVE-2019-11756 https://nvd.nist.gov/vuln/detail/CVE-2019-11756
mfsa2019-36 https://www.mozilla.org/en-US/security/advisories/mfsa2019-36
RHSA-2020:3280 https://access.redhat.com/errata/RHSA-2020:3280
RHSA-2020:4076 https://access.redhat.com/errata/RHSA-2020:4076
RHSA-2021:0758 https://access.redhat.com/errata/RHSA-2021:0758
RHSA-2021:0876 https://access.redhat.com/errata/RHSA-2021:0876
RHSA-2021:0949 https://access.redhat.com/errata/RHSA-2021:0949
RHSA-2021:1026 https://access.redhat.com/errata/RHSA-2021:1026
USN-4216-1 https://usn.ubuntu.com/4216-1/
USN-4216-2 https://usn.ubuntu.com/4216-2/
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-11756.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: AV:N/AC:M/Au:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2019-11756
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:R/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2019-11756
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://nvd.nist.gov/vuln/detail/CVE-2019-11756
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 0.40525
EPSS Score 0.0021
Published At March 28, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
There are no relevant records.