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CVE-2016-9904

An attacker could use a JavaScript Map/Set timing attack to determine whether an atom is used by another compartment/zone in specific…

High7.5EPSS 2.7%
Published
Updated
Reserved
Assigned by
mozilla

Description

An attacker could use a JavaScript Map/Set timing attack to determine whether an atom is used by another compartment/zone in specific contexts. This could be used to leak information, such as usernames embedded in JavaScript code, across websites. This vulnerability affects Firefox < 50.1, Firefox ESR < 45.6, and Thunderbird < 45.6.

Scores

CVSS scores of CVE-2016-9904, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.0High7.5CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS (exploitation in 30 days)
2.7% · top 14% of all CVEs (2 Nov 2026)

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The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Weakness

Affected products

  • Mozilla · Firefox

    • affected unspecified – < 50.1

  • Mozilla · Firefox ESR

    • affected unspecified – < 45.6

  • Mozilla · Thunderbird

    • affected unspecified – < 45.6

References (9)

Sources

The same CVE in the primary databases and aggregators, to check against.

Record last updated .