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Vulnerability details: VCID-z7kk-jkbr-aaap
Vulnerability ID VCID-z7kk-jkbr-aaap
Aliases CVE-2015-4520
Summary CVE-2015-4520 Mozilla: Errors in the handling of CORS preflight request headers (MFSA 2015-111)
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-254 7PK - Security Features
CWE-284 Improper Access Control
System Score Found at
generic_textual Medium http://people.canonical.com/~ubuntu-security/cve/2015/CVE-2015-4520.html
rhas Critical https://access.redhat.com/errata/RHSA-2015:1834
rhas Important https://access.redhat.com/errata/RHSA-2015:1852
epss 0.0026 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.0026 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00592 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00592 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00592 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00592 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00592 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00592 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00592 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00592 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00592 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00592 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00592 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00592 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00592 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00592 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00592 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00592 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00592 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00592 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00592 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00592 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.00772 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.01106 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.01106 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.01106 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.01106 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.01106 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.01106 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.01106 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.01106 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.01106 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.01106 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.01106 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.01170 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.01170 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.01170 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
epss 0.01687 https://api.first.org/data/v1/epss?cve=CVE-2015-4520
rhbs high https://bugzilla.redhat.com/show_bug.cgi?id=1265781
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4500
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4506
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4509
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4511
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4517
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4519
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4520
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4521
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4522
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7174
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7175
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7176
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7177
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7180
cvssv2 6.4 https://nvd.nist.gov/vuln/detail/CVE-2015-4520
generic_textual Medium https://ubuntu.com/security/notices/USN-2743-1
generic_textual Medium https://ubuntu.com/security/notices/USN-2754-1
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2015-111
generic_textual Medium https://www.mozilla.org/en-US/security/advisories/mfsa2015-111/
cvssv3.1 8.8 http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
generic_textual HIGH http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
generic_textual HIGH http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
Reference id Reference type URL
http://lists.opensuse.org/opensuse-security-announce/2015-10/msg00000.html
http://lists.opensuse.org/opensuse-security-announce/2015-10/msg00003.html
http://lists.opensuse.org/opensuse-security-announce/2015-10/msg00004.html
http://lists.opensuse.org/opensuse-security-announce/2015-10/msg00005.html
http://lists.opensuse.org/opensuse-security-announce/2015-10/msg00007.html
http://lists.opensuse.org/opensuse-security-announce/2015-11/msg00025.html
http://people.canonical.com/~ubuntu-security/cve/2015/CVE-2015-4520.html
http://rhn.redhat.com/errata/RHSA-2015-1834.html
http://rhn.redhat.com/errata/RHSA-2015-1852.html
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2015-4520.json
https://api.first.org/data/v1/epss?cve=CVE-2015-4520
https://bugzilla.mozilla.org/show_bug.cgi?id=1200856
https://bugzilla.mozilla.org/show_bug.cgi?id=1200869
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4500
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4506
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4509
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4511
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4517
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4519
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4520
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4521
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4522
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7174
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7175
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7176
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7177
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7180
https://ubuntu.com/security/notices/USN-2743-1
https://ubuntu.com/security/notices/USN-2754-1
https://www.mozilla.org/en-US/security/advisories/mfsa2015-111/
http://www.debian.org/security/2015/dsa-3365
http://www.mozilla.org/security/announce/2015/mfsa2015-111.html
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
http://www.securityfocus.com/bid/76816
http://www.securitytracker.com/id/1033640
http://www.ubuntu.com/usn/USN-2743-1
http://www.ubuntu.com/usn/USN-2743-2
http://www.ubuntu.com/usn/USN-2743-3
http://www.ubuntu.com/usn/USN-2743-4
http://www.ubuntu.com/usn/USN-2754-1
1265781 https://bugzilla.redhat.com/show_bug.cgi?id=1265781
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:38.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:38.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:38.0.1:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:38.0.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:38.0.5:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:38.0.5:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:38.1.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:38.1.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:38.1.1:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:38.1.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:38.2.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:38.2.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:38.2.1:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:38.2.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:38.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox_esr:38.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:38.0.1:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox_esr:38.0.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:38.0.5:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox_esr:38.0.5:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:38.1.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox_esr:38.1.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:38.1.1:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox_esr:38.1.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:38.2.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox_esr:38.2.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:38.2.1:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox_esr:38.2.1:*:*:*:*:*:*:*
CVE-2015-4520 https://nvd.nist.gov/vuln/detail/CVE-2015-4520
mfsa2015-111 https://www.mozilla.org/en-US/security/advisories/mfsa2015-111
RHSA-2015:1834 https://access.redhat.com/errata/RHSA-2015:1834
RHSA-2015:1852 https://access.redhat.com/errata/RHSA-2015:1852
USN-2743-1 https://usn.ubuntu.com/2743-1/
USN-2754-1 https://usn.ubuntu.com/2754-1/
No exploits are available.
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2015-4520
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:R/S:U/C:H/I:H/A:H Found at http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
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 0.49178
EPSS Score 0.0026
Published At June 20, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
There are no relevant records.