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Fencer Intel
critical 10.0

CVE-2015-2733 json

Use-after-free vulnerability in the CanonicalizeXPCOMParticipant function in Mozilla Firefox before 39.0 and Firefox ESR 31.x before 31.8 a…

published 2015-07-06 11 y ago modified 2026-06-17 4 mo ago also EUVD-2015-2823

cvss
10.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
6.1%
EPSS 6.1% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

Use-after-free vulnerability in the CanonicalizeXPCOMParticipant function in Mozilla Firefox before 39.0 and Firefox ESR 31.x before 31.8 and 38.x before 38.1 allows remote attackers to execute arbitrary code via vectors involving attachment of an XMLHttpRequest object to a dedicated worker.

Patch / fix

  • firefox Ubuntu 14.04 LTS 39.0+build5-0ubuntu0.14.04.1

ubuntu advisories UBUNTU-CVE-2015-2733

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • firefox RHEL 5 38.1.0-1.el5_11
  • firefox RHEL 6 38.1.0-1.el6_6
  • firefox RHEL 7 38.1.0-1.el7_1

red hat advisories RHSA-2015:1207

  • mozilla-nss SLES 11 SP2-LTSS, SLES 11 SP1-TERADATA, SLES 11 SP1-LTSS 3.19.2.0-0.7.1
  • firefox-gcc47 SLES 11 SP2-LTSS, SLES 11 SP1-TERADATA, SLES 11 SP1-LTSS 4.7.2_20130108-0.37.2
  • MozillaFirefox SLES 11 SP2-LTSS, SLES 11 SP1-TERADATA, SLES 11 SP1-LTSS 38.2.0esr-10.1
  • MozillaFirefox-branding-SLED SLES 11 SP2-LTSS, SLES 11 SP1-TERADATA, SLES 11 SP1-LTSS 31.0-0.5.7.11
  • mozilla-nss SLES 11 SP4, SLES 11 SP3-TERADATA, SLES 11 SP3 +6 more 3.19.2_CKBI_1.98-0.10.1
  • mozilla-nspr SLES 11 SP4, SLES 11 SP3-TERADATA, SLES 11 SP3 +6 more 4.10.8-0.5.1
  • MozillaFirefox SLES 11 SP4, SLES 11 SP3-TERADATA, SLES 11 SP3 +6 more 31.8.0esr-0.10.1
  • mozilla-nss SLES for SAP 12, SLES 12, SLED 12 +1 more 3.19.2_CKBI_1.98-21.1

suse advisories SUSE-SU-2015:1449-1SUSE-SU-2015:1268-1SUSE-SU-2015:1268-2SUSE-SU-2015:1269-1

  • MozillaFirefox openSUSE Tumbleweed 50.1.0-1.1
  • MozillaThunderbird openSUSE Tumbleweed 45.5.1-1.1

opensuse advisories openSUSE-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-2015-2733 updated cvss 6.8

Mozilla: Use-after-free in workers while using XMLHttpRequest (MFSA 2015-65)

  • Red Hat Enterprise Linux (v. 5 server) firefox 38.1.0-1.el5_11 Red Hat Enterprise Linux Client (v. 7) firefox 38.1.0-1.el7_1 Red Hat Enterprise Linux Client Optional (v. 7) firefox 38.1.0-1.el7_1 Red Hat Enterprise Linux Desktop (v. 5 client) firefox 38.1.0-1.el5_11 Red Hat Enterprise Linux Desktop (v. 6) firefox 38.1.0-1.el6_6 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 38.1.0-1.el6_6
    +9 more products
    Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 38.1.0-1.el6_6 Red Hat Enterprise Linux Server (v. 6) firefox 38.1.0-1.el6_6 Red Hat Enterprise Linux Server (v. 7) firefox 38.1.0-1.el7_1, firefox 38.1.0-1.ael7b_1 Red Hat Enterprise Linux Server Optional (v. 6) firefox 38.1.0-1.el6_6 Red Hat Enterprise Linux Server Optional (v. 7) firefox 38.1.0-1.el7_1 Red Hat Enterprise Linux Workstation (v. 6) firefox 38.1.0-1.el6_6 Red Hat Enterprise Linux Workstation (v. 7) firefox 38.1.0-1.el7_1 Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 38.1.0-1.el6_6 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 38.1.0-1.el7_1
    fixed: vendor fix RHSA-2015:1207
  • Red Hat Enterprise Linux 5 thunderbird Red Hat Enterprise Linux 6 thunderbird Red Hat Enterprise Linux 7 thunderbird
    not affected: vulnerable code not present

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

6.14% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C

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.