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Vulnerability details: VCID-zaba-2xbh-aaac
Vulnerability ID VCID-zaba-2xbh-aaac
Aliases CVE-2019-9803
Summary The Upgrade-Insecure-Requests (UIR) specification states that if UIR is enabled through Content Security Policy (CSP), navigation to a same-origin URL must be upgraded to HTTPS. Firefox will incorrectly navigate to an HTTP URL rather than perform the security upgrade requested by the CSP in some circumstances, allowing for potential man-in-the-middle attacks on the linked resources. This vulnerability affects Firefox < 66.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-346 Origin Validation Error
System Score Found at
generic_textual Medium http://people.canonical.com/~ubuntu-security/cve/2019/CVE-2019-9803.html
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epss 0.0013 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
epss 0.0013 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
epss 0.0013 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
epss 0.0013 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
epss 0.0013 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
epss 0.0013 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
epss 0.0013 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
epss 0.0013 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
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epss 0.0013 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
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epss 0.0013 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
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epss 0.0013 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
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epss 0.0013 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
epss 0.0013 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
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epss 0.0013 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
epss 0.0013 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
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epss 0.0013 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
epss 0.0013 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
epss 0.00148 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
epss 0.00148 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
epss 0.00148 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
epss 0.00148 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2019-9803
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9803
cvssv2 5.8 https://nvd.nist.gov/vuln/detail/CVE-2019-9803
cvssv3 7.4 https://nvd.nist.gov/vuln/detail/CVE-2019-9803
archlinux Critical https://security.archlinux.org/AVG-925
generic_textual Low https://ubuntu.com/security/notices/USN-3918-1
generic_textual Low https://ubuntu.com/security/notices/USN-3918-2
generic_textual Low https://usn.ubuntu.com/usn/usn-3918-1
generic_textual Low https://usn.ubuntu.com/usn/usn-3918-2
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2019-07
generic_textual Medium https://www.mozilla.org/en-US/security/advisories/mfsa2019-07/#CVE-2019-9803
Reference id Reference type URL
http://people.canonical.com/~ubuntu-security/cve/2019/CVE-2019-9803.html
https://api.first.org/data/v1/epss?cve=CVE-2019-9803
https://bugzilla.mozilla.org/show_bug.cgi?id=1437009
https://bugzilla.mozilla.org/show_bug.cgi?id=1515863
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9803
https://ubuntu.com/security/notices/USN-3918-1
https://ubuntu.com/security/notices/USN-3918-2
https://usn.ubuntu.com/usn/usn-3918-1
https://usn.ubuntu.com/usn/usn-3918-2
https://w3c.github.io/webappsec-upgrade-insecure-requests/
https://www.mozilla.org/en-US/security/advisories/mfsa2019-07/#CVE-2019-9803
https://www.mozilla.org/security/advisories/mfsa2019-07/
ASA-201903-11 https://security.archlinux.org/ASA-201903-11
AVG-925 https://security.archlinux.org/AVG-925
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-2019-9803 https://nvd.nist.gov/vuln/detail/CVE-2019-9803
mfsa2019-07 https://www.mozilla.org/en-US/security/advisories/mfsa2019-07
USN-3918-1 https://usn.ubuntu.com/3918-1/
USN-3918-2 https://usn.ubuntu.com/3918-2/
No exploits are available.
Vector: AV:N/AC:M/Au:N/C:P/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2019-9803
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:H/PR:N/UI:N/S:U/C:H/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2019-9803
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 0.16703
EPSS Score 0.00101
Published At March 29, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
There are no relevant records.