Medium severity6.1NVD Advisory· Published Jun 24, 2021· Updated Jun 17, 2026

CVE-2021-29953

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Mozilla Corporation/Firefoxllm-fuzzy2 versions
<88.0.1+ 1 more
- (no CPE)range: <88.0.1
- (no CPE)range: unspecified
Mozilla Corporation/Firefox for Androidllm-fuzzy2 versions
<88.1.3+ 1 more
- (no CPE)range: <88.1.3
- (no CPE)range: unspecified

Patches

Vulnerability mechanics

References

bugzilla.mozilla.org/show_bug.cginvdPermissions RequiredVendor Advisory
www.mozilla.org/security/advisories/mfsa2021-20/nvdRelease NotesVendor Advisory

News mentions

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cvss	0.397
epss	0.001
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000