CVE-2020-26977
MediumCVSS 6.5Exploitation Probability (EPSS)
Elevated risk55th percentile - higher than 55% of all known CVEs
Summary
By attempting to connect to a website using an unresponsive port, an attacker could control the content of a tab while the URL bar displayed the original domain. Affects Firefox for Android < 84.
Risk Assessment
An attacker could impersonate a trusted site, potentially leading to phishing or displaying fraudulent content to the user.
Recommendation
Update Firefox for Android to version 84 or later.
Other vulnerabilities in Firefox for Android
See all- CVE-2023-29534Critical
In Firefox and Focus for Android, techniques were discovered to obscure the fullscreen notification, which could lead to user confusion and spoofing attacks. This affects Firefox for Android and Focus for Android versions prior to 112.
- CVE-2026-100823Medium
Spoofing issue in the Downloads component in Firefox for Android. This vulnerability was fixed in Firefox 157.
- CVE-2026-92033High
Privilege escalation vulnerability in Firefox for Android. Fixed in Firefox 156.
- CVE-2026-84117High
Privilege escalation in Firefox for Android. Fixed in Firefox 155.
- CVE-2026-74975Medium
A spoofing issue exists in the Downloads component in Firefox for Android. This vulnerability was fixed in Firefox 154.
- CVE-2026-18809Medium
Information disclosure in Firefox for Android and Firefox Focus for Android. This vulnerability was fixed in Firefox 153.0.3.
- CVE-2026-16397Medium
Clickjacking vulnerability in the WebExtensions component in Firefox for Android. This issue was fixed in Firefox 153.
- CVE-2026-16373High
Vulnerability in the Privacy component in Firefox for Android. The flaw leads to information disclosure. The issue was fixed in Firefox 153.
- CVE-2025-8041Medium
In Firefox for Android, the address bar truncated the display of URLs from the end instead of prioritizing the origin. This vulnerability was fixed in Firefox 141.
- CVE-2025-6431Medium
When a link can be opened in an external application, Firefox for Android will, by default, prompt the user before doing so. An attacker could have bypassed this prompt, potentially exposing the user to security vulnerabilities or privacy leaks in external applications. This bug only affects Firefox for Android. Other versions of Firefox are unaffected. This vulnerability was fixed in Firefox 140.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS