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Vulnerability details: VCID-eh66-71a6-k7be
Vulnerability ID VCID-eh66-71a6-k7be
Aliases CVE-2020-26963
Summary Repeated calls to the history and location interfaces could have been used to hang the browser. This was addressed by introducing rate-limiting to these API calls.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (0)
There are no known CWE.
System Score Found at
epss 0.00405 https://api.first.org/data/v1/epss?cve=CVE-2020-26963
epss 0.00405 https://api.first.org/data/v1/epss?cve=CVE-2020-26963
epss 0.00405 https://api.first.org/data/v1/epss?cve=CVE-2020-26963
epss 0.00405 https://api.first.org/data/v1/epss?cve=CVE-2020-26963
epss 0.00405 https://api.first.org/data/v1/epss?cve=CVE-2020-26963
epss 0.00405 https://api.first.org/data/v1/epss?cve=CVE-2020-26963
epss 0.00405 https://api.first.org/data/v1/epss?cve=CVE-2020-26963
epss 0.00405 https://api.first.org/data/v1/epss?cve=CVE-2020-26963
epss 0.00405 https://api.first.org/data/v1/epss?cve=CVE-2020-26963
epss 0.00405 https://api.first.org/data/v1/epss?cve=CVE-2020-26963
epss 0.00405 https://api.first.org/data/v1/epss?cve=CVE-2020-26963
epss 0.00405 https://api.first.org/data/v1/epss?cve=CVE-2020-26963
epss 0.00405 https://api.first.org/data/v1/epss?cve=CVE-2020-26963
epss 0.00405 https://api.first.org/data/v1/epss?cve=CVE-2020-26963
epss 0.00405 https://api.first.org/data/v1/epss?cve=CVE-2020-26963
epss 0.00405 https://api.first.org/data/v1/epss?cve=CVE-2020-26963
cvssv3.1 4.3 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2020-26963
cvssv3.1 4.3 https://nvd.nist.gov/vuln/detail/CVE-2020-26963
archlinux Critical https://security.archlinux.org/AVG-1279
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-50
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2020-26963
https://bugzilla.mozilla.org/show_bug.cgi?id=1314912
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://www.mozilla.org/security/advisories/mfsa2020-50/
ASA-202011-12 https://security.archlinux.org/ASA-202011-12
AVG-1279 https://security.archlinux.org/AVG-1279
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-2020-26963 https://nvd.nist.gov/vuln/detail/CVE-2020-26963
mfsa2020-50 https://www.mozilla.org/en-US/security/advisories/mfsa2020-50
USN-4637-1 https://usn.ubuntu.com/4637-1/
USN-4637-2 https://usn.ubuntu.com/4637-2/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L 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:M/Au:N/C:N/I:N/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2020-26963
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:N/I:N/A:L Found at https://nvd.nist.gov/vuln/detail/CVE-2020-26963
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 0.60191
EPSS Score 0.00405
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:43.817659+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2020/mfsa2020-50.yml 37.0.0