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Fencer Intel
high 7.5

CVE-2014-1487 json

The Web workers implementation in Mozilla Firefox before 27.0, Firefox ESR 24.x before 24.3, Thunderbird before 24.3, and SeaMonkey before…

published 2014-02-06 12 y ago modified 2026-06-17 4 mo ago also EUVD-2014-1563

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.3%
EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

The Web workers implementation in Mozilla Firefox before 27.0, Firefox ESR 24.x before 24.3, Thunderbird before 24.3, and SeaMonkey before 2.24 allows remote attackers to bypass the Same Origin Policy and obtain sensitive authentication information via vectors involving error messages.

Patch / fix

  • mozilla firefox 24.3, 27.0
  • mozilla seamonkey 2.24
  • mozilla thunderbird 24.3
  • thunderbird RHEL 5 PRODUCTIVITY, RHEL 5 24.3.0-2.el5_10
  • thunderbird RHEL 6 24.3.0-2.el6_5
  • firefox RHEL 5 24.3.0-2.el5_10
  • firefox RHEL 6 24.3.0-2.el6_5

red hat advisories RHSA-2014:0133RHSA-2014:0132

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 50.1.0-1.1
  • MozillaThunderbird openSUSE Tumbleweed 45.5.1-1.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10071-1openSUSE-SU-2024:10230-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2014-1487 updated cvss 4.3

Mozilla: Cross-origin information leak through web workers (MFSA 2014-09)

  • Red Hat Enterprise Linux (v. 5 server) firefox 24.3.0-2.el5_10 Red Hat Enterprise Linux Desktop (v. 5 client) firefox 24.3.0-2.el5_10, thunderbird 24.3.0-2.el5_10 Red Hat Enterprise Linux Desktop (v. 6) firefox 24.3.0-2.el6_5, thunderbird 24.3.0-2.el6_5 Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 24.3.0-2.el6_5
    fixed: vendor fix RHSA-2014:0132
  • Red Hat Enterprise Linux Optional Productivity Applications (v. 5 server) thunderbird 24.3.0-2.el5_10
    fixed: vendor fix RHSA-2014:0133
  • Red Hat Enterprise Linux Server (v. 6) firefox 24.3.0-2.el6_5
    fixed: vendor fix RHSA-2014:0132
  • Red Hat Enterprise Linux Server Optional (v. 6) thunderbird 24.3.0-2.el6_5
    fixed: vendor fix RHSA-2014:0133
  • Red Hat Enterprise Linux Workstation (v. 6) firefox 24.3.0-2.el6_5, thunderbird 24.3.0-2.el6_5
    fixed: vendor fix RHSA-2014:0132

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.32% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=947592 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.