Medium severity · published Jan 7, 2021
CVE-2020-26977
By attempting to connect a website using an unresponsive port, an attacker could have controlled the content of a tab while the URL bar displayed the original domain
6.5
CVSS
0.9%
EPSS
No
On KEV
Description
By attempting to connect a website using an unresponsive port, an attacker could have controlled the content of a tab while the URL bar displayed the original domain. *Note: This issue only affects Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 84.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 59% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FM
Firefox Mobile · Mozilla
before 84.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-26977
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-26977
Permissions Required
https://bugzilla.mozilla.org/show_bug.cgi?id=1676311
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-54/
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