CVE-2021-29953

A malicious webpage could have forced a Firefox for Android user into executing attacker-controlled JavaScript in the context of another domain, resulting in a Universal Cross-Site Scripting vulnerability. *Note: This issue only affected Firefox for Android. Other operating systems are unaffected. Further details are being temporarily withheld to allow users an opportunity to update.*. This vulnerability affects Firefox < 88.0.1 and Firefox for Android < 88.1.3.

• CWE-79

• https://bugzilla.mozilla.org/show_bug.cgi?id=1701684Permissions Required, Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2021-20/Release Notes, Vendor Advisory
• https://bugzilla.mozilla.org/show_bug.cgi?id=1701684Permissions Required, Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2021-20/Release Notes, Vendor Advisory

Published

Jun 24, 2021

Last Modified

Jun 17, 2026

Status

Modified

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• CVE-2021-29947Mozilla developers and community members reported memory saf…8.8
• CVE-2021-29948Signatures are written to disk before and read during verifi…2.5
• CVE-2021-29949When loading the shared library that provides the OTR protoc…7.8
• CVE-2021-29950Thunderbird unprotects a secret OpenPGP key prior to using i…7.5
• CVE-2021-29951The Mozilla Maintenance Service granted SERVICE_START access…6.5
• CVE-2021-29952When Web Render components were destructed, a race condition…7.5
• CVE-2021-29954Proxy functionality built into Hubs Cloud’s Reticulum softwa…9.8
• CVE-2021-29955A transient execution vulnerability, named Floating Point Va…5.3
• CVE-2021-29956OpenPGP secret keys that were imported using Thunderbird ver…4.3
• CVE-2021-29957If a MIME encoded email contains an OpenPGP inline signed or…4.3
• CVE-2021-29958When a download was initiated, the client did not check whet…4.3
• CVE-2021-29959When a user has already allowed a website to access micropho…4.3