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HIGH

CVE-2017-5378

CVSS v3

7.5

HIGH

EPSS Score

3.3 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2017-5378 Red Hat Product Security273 products fixed

    Mozilla: Pointer and frame data leakage of Javascript objects (MFSA 2017-02)

  • RHSA-2017:0238 Red Hat Product Security42 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2017:0190 Red Hat Product Security77 products fixed

    Red Hat Security Advisory: firefox security update

Full record on NVD

Description

Hashed codes of JavaScript objects are shared between pages. This allows for pointer leaks because an object's address can be discovered through hash codes, and also allows for data leakage of an object's content using these hash codes. This vulnerability affects Thunderbird < 45.7, Firefox ESR < 45.7, and Firefox < 51.

Technical details

Published
2018-06-11

Frequently asked questions

What is CVE-2017-5378?

Hashed codes of JavaScript objects are shared between pages. This allows for pointer leaks because an object's address can be discovered through hash codes, and also allows for data leakage of an object's content using these hash codes. This vulnerability affects Thunderbird < 45.7, Firefox ESR < 45.7, and Firefox < 51.

Is CVE-2017-5378 actively exploited?

Active exploitation of CVE-2017-5378 has not been confirmed. Its EPSS score was 3.3% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2017-5378?

CVE-2017-5378 has a CVSS v3 base score of 7.5 (HIGH severity).

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