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Fencer Intel
critical 9.1

CVE-2017-7758 json

An out-of-bounds read vulnerability with the Opus encoder when the number of channels in an audio stream changes while the encoder is in us…

published 2018-06-11 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-16733

cvss
9.1
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.0%
EPSS 3.0% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

An out-of-bounds read vulnerability with the Opus encoder when the number of channels in an audio stream changes while the encoder is in use. This vulnerability affects Firefox < 54, Firefox ESR < 52.2, and Thunderbird < 52.2.

Patch / fix

  • Mozilla Firefox 54
  • Mozilla Firefox ESR 52.2
  • Mozilla Thunderbird 52.2
  • firefox-esr Debian 14, Debian 13, Debian 12 52.2.0esr-1

debian advisories DEBIAN-CVE-2017-7758

  • firefox Ubuntu 14.04 LTS 54.0+build3-0ubuntu0.14.04.1
  • firefox Ubuntu 16.04 LTS 54.0+build3-0ubuntu0.16.04.1
  • thunderbird Ubuntu 14.04 LTS 1:52.2.1+build1-0ubuntu0.14.04.1
  • thunderbird Ubuntu 16.04 LTS 1:52.2.1+build1-0ubuntu0.16.04.1

ubuntu advisories UBUNTU-CVE-2017-7758

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

  • thunderbird RHEL 6 52.2.0-1.el6_9
  • thunderbird RHEL 7 52.2.0-1.el7_3
  • firefox RHEL 6 52.2.0-1.el6_9
  • firefox RHEL 7 52.2.0-1.el7_3

red hat advisories RHSA-2017:1561RHSA-2017:1440

  • mozilla-nss SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +3 more 3.29.5-47.3.2
  • firefox-gcc5 SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +2 more 5.3.1+r233831-7.1
  • MozillaFirefox SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +3 more 52.2.0esr-72.5.2
  • firefox-libffi-gcc5 SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +2 more 5.3.1+r233831-7.1
  • MozillaFirefox-branding-SLED SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +2 more 52-24.3.44
  • MozillaFirefox-branding-SLE SLES for SAP 12 SP2, SLES for SAP 12 SP1, SLES for SAP 12 +6 more 52-31.1
  • MozillaFirefox SLES for SAP 12 SP2, SLES for SAP 12 SP1, SLES for SAP 12 +7 more 52.2.0esr-108.3

suse advisories SUSE-SU-2017:2235-1SUSE-SU-2017:1669-1

  • MozillaThunderbird openSUSE Tumbleweed 91.1.1-1.1
  • MozillaThunderbird Package Hub 12 52.2-36.1

opensuse advisories openSUSE-SU-2024:10601-1openSUSE-SU-2017:1579-1

  • firefox Arch Linux 54.0-1
  • thunderbird Arch Linux 52.2.0-1

arch linux advisories AVG-302AVG-303

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-2017-7758 updated cvss 9.1

Mozilla: Out-of-bounds read in Opus encoder (MFSA 2017-16)

  • Red Hat Enterprise Linux Client (v. 7) firefox 52.2.0-1.el7_3, thunderbird 52.2.0-1.el7_3 Red Hat Enterprise Linux Client Optional (v. 7) firefox 52.2.0-1.el7_3 Red Hat Enterprise Linux Desktop (v. 6) firefox 52.2.0-1.el6_9, thunderbird 52.2.0-1.el6_9 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 52.2.0-1.el6_9 Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 52.2.0-1.el6_9 Red Hat Enterprise Linux Server (v. 6) firefox 52.2.0-1.el6_9
    +7 more products
    Red Hat Enterprise Linux Server (v. 7) firefox 52.2.0-1.el7_3 Red Hat Enterprise Linux Server Optional (v. 6) firefox 52.2.0-1.el6_9, thunderbird 52.2.0-1.el6_9 Red Hat Enterprise Linux Server Optional (v. 7) firefox 52.2.0-1.el7_3, thunderbird 52.2.0-1.el7_3 Red Hat Enterprise Linux Workstation (v. 6) firefox 52.2.0-1.el6_9, thunderbird 52.2.0-1.el6_9 Red Hat Enterprise Linux Workstation (v. 7) firefox 52.2.0-1.el7_3, thunderbird 52.2.0-1.el7_3 Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 52.2.0-1.el6_9 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 52.2.0-1.el7_3
    fixed: vendor fix RHSA-2017:1440

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

3.04% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1368490 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 9.1 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
NVD 2.0 6.4 AV:N/AC:L/Au:N/C:P/I:N/A:P

Affected products

  • Mozilla Firefox
  • Mozilla Firefox ESR
  • Mozilla Thunderbird

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.