CVE-2021-29952

When Web Render components were destructed, a race condition could have caused undefined behavior, and we presume that with enough effort may have been exploitable to run arbitrary code. This vulnerability affects Firefox < 88.0.1 and Firefox for Android < 88.1.3.

• CWE-362

• https://bugzilla.mozilla.org/show_bug.cgi?id=1704227Permissions Required, Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2021-20/Release Notes, Vendor Advisory
• https://bugzilla.mozilla.org/show_bug.cgi?id=1704227Permissions 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

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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• CVE-2021-29946Ports that were written as an integer overflow above the bou…8.8
• 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-2021-29953A malicious webpage could have forced a Firefox for Android …6.1
• 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