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Vulnerability details: VCID-2hqr-thks-zbet
Vulnerability ID VCID-2hqr-thks-zbet
Aliases CVE-2017-7783
Summary If a long user name is used in a username/password combination in a site URL (such as http://UserName:Password@example.com), the resulting modal prompt will hang in a non-responsive state or crash, causing a denial of service.
Status Published
Exploitability 2.0
Weighted Severity 9.0
Risk 10.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-20 Improper Input Validation
System Score Found at
cvssv3 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2017-7783.json
epss 0.14112 https://api.first.org/data/v1/epss?cve=CVE-2017-7783
epss 0.14112 https://api.first.org/data/v1/epss?cve=CVE-2017-7783
epss 0.14112 https://api.first.org/data/v1/epss?cve=CVE-2017-7783
epss 0.14112 https://api.first.org/data/v1/epss?cve=CVE-2017-7783
epss 0.14112 https://api.first.org/data/v1/epss?cve=CVE-2017-7783
epss 0.1523 https://api.first.org/data/v1/epss?cve=CVE-2017-7783
epss 0.1523 https://api.first.org/data/v1/epss?cve=CVE-2017-7783
epss 0.1523 https://api.first.org/data/v1/epss?cve=CVE-2017-7783
epss 0.1523 https://api.first.org/data/v1/epss?cve=CVE-2017-7783
epss 0.1523 https://api.first.org/data/v1/epss?cve=CVE-2017-7783
epss 0.1523 https://api.first.org/data/v1/epss?cve=CVE-2017-7783
epss 0.1523 https://api.first.org/data/v1/epss?cve=CVE-2017-7783
epss 0.1523 https://api.first.org/data/v1/epss?cve=CVE-2017-7783
cvssv2 5.4 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3 6.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2017-7783
cvssv3 7.5 https://nvd.nist.gov/vuln/detail/CVE-2017-7783
archlinux Critical https://security.archlinux.org/AVG-375
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2017-18
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2017-7783.json
https://api.first.org/data/v1/epss?cve=CVE-2017-7783
https://bugzilla.mozilla.org/show_bug.cgi?id=1360842
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://www.exploit-db.com/exploits/43020/
https://www.mozilla.org/security/advisories/mfsa2017-18/
http://www.securityfocus.com/bid/100401
http://www.securitytracker.com/id/1039124
1479176 https://bugzilla.redhat.com/show_bug.cgi?id=1479176
ASA-201708-3 https://security.archlinux.org/ASA-201708-3
AVG-375 https://security.archlinux.org/AVG-375
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-2017-7783 Exploit https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/multiple/dos/43020.txt
CVE-2017-7783 https://nvd.nist.gov/vuln/detail/CVE-2017-7783
mfsa2017-18 https://www.mozilla.org/en-US/security/advisories/mfsa2017-18
USN-3391-1 https://usn.ubuntu.com/3391-1/
Data source Exploit-DB
Date added Oct. 20, 2017
Description Mozilla Firefox < 55 - Denial of Service
Ransomware campaign use Known
Source publication date Oct. 20, 2017
Exploit type dos
Platform multiple
Source update date Oct. 20, 2017
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2017-7783.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:H/Au:N/C:N/I:N/A:C Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
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:N/I:N/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:N/I:N/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2017-7783
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:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2017-7783
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 0.94064
EPSS Score 0.14112
Published At Aug. 12, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:18.849059+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2017/mfsa2017-18.yml 37.0.0