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Fencer Intel
high 8.8

CVE-2018-18503 json

When JavaScript is used to create and manipulate an audio buffer, a potentially exploitable crash may occur because of a compartment mismat…

published 2019-02-05 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-10228

cvss
8.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits
0
none known

Summary

When JavaScript is used to create and manipulate an audio buffer, a potentially exploitable crash may occur because of a compartment mismatch in some situations. This vulnerability affects Firefox < 65.

Patch / fix

  • Mozilla Firefox 65
  • firefox Ubuntu 14.04 LTS 65.0+build2-0ubuntu0.14.04.1
  • firefox Ubuntu 16.04 LTS 65.0+build2-0ubuntu0.16.04.1
  • firefox Ubuntu 18.04 LTS 65.0+build2-0ubuntu0.18.04.1

ubuntu advisories UBUNTU-CVE-2018-18503

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-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 92.0-1.2

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10600-1

  • firefox Arch Linux 65.0-1

arch linux advisories AVG-862

Exploit prediction

1.38% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 8.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • Mozilla Firefox

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

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.