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Fencer Vulns
high 8.8

CVE-2022-22740 json

Certain network request objects were freed too early when releasing a network request handle.

published 2022-12-22 3 y ago modified 2026-06-17 4 mo ago also EUVD-2022-27883

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 63%
public exploits
0
none known

Summary

Certain network request objects were freed too early when releasing a network request handle. This could have lead to a use-after-free causing a potentially exploitable crash. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5.

Patch / fix

  • Mozilla Firefox ESR 91.5
  • Mozilla Firefox 96
  • Mozilla Thunderbird 91.5
  • firefox-esr Debian 14, Debian 13, Debian 12 91.5.0esr-1
  • thunderbird Debian 14, Debian 13, Debian 12 1:91.5.0-1

debian advisories DEBIAN-CVE-2022-22740

  • firefox Ubuntu 18.04 LTS 96.0+build2-0ubuntu0.18.04.1
  • firefox Ubuntu 20.04 LTS 96.0+build2-0ubuntu0.20.04.1
  • firefox Ubuntu 22.04 LTS 96.0+build2-0ubuntu1
  • thunderbird Ubuntu 18.04 LTS 1:91.5.0+build1-0ubuntu0.18.04.1
  • thunderbird Ubuntu 20.04 LTS 1:91.5.0+build1-0ubuntu0.20.04.1
  • thunderbird Ubuntu 22.04 LTS 1:91.5.0+build1-0ubuntu1

ubuntu advisories UBUNTU-CVE-2022-22740

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 8 91.5.0-1.el8_5
  • thunderbird RHEL 7 91.5.0-1.el7_9
  • firefox RHEL 8 91.5.0-1.el8_5
  • firefox RHEL 7 91.5.0-1.el7_9
  • firefox RHEL 8.1 E4S 91.5.0-1.el8_1
  • firefox RHEL 8.4 EUS 91.5.0-1.el8_4
  • thunderbird RHEL 8.4 EUS 91.5.0-1.el8_4
  • thunderbird RHEL 8.2 EUS 91.5.0-1.el8_2

red hat advisories RHSA-2022:0125RHSA-2022:0126RHSA-2022:0128RHSA-2022:0129RHSA-2022:0123RHSA-2022:0131

  • MozillaThunderbird SLE Workstation Extension 15 SP3 91.5.0-8.51.1
  • MozillaFirefox SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +7 more 91.5.0-150.15.1
  • MozillaFirefox SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLES 15 SP2-BCL +7 more 91.5.0-152.12.1
  • MozillaFirefox SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +11 more 91.5.0-112.86.1
  • MozillaFirefox SLES 11 SP4-LTSS 91.5.0-78.159.1

suse advisories SUSE-SU-2022:0199-1SUSE-SU-2022:14880-1SUSE-SU-2022:0137-1SUSE-SU-2022:0136-1SUSE-SU-2022:0115-1

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 96.0-1.1
  • MozillaThunderbird openSUSE Tumbleweed 91.5.0-1.1
  • MozillaThunderbird openSUSE Leap 15.3 91.5.0-8.51.1
  • MozillaFirefox openSUSE Leap 15.3 91.5.0-152.12.1
  • civetweb openSUSE Leap 15.3 1.15-lp153.2.3.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:11732-1openSUSE-SU-2024:11733-1openSUSE-SU-2022:0199-1openSUSE-SU-2022:0136-1

  • firefox AlmaLinux 8 91.5.0-1.el8_5.alma
  • thunderbird AlmaLinux 8 91.5.0-1.el8_5.alma.plus
  • thunderbird AlmaLinux 8 91.5.0-1.el8_5.alma

almalinux advisories ALSA-2022:0130ALSA-2022:0129

  • firefox Rocky Linux 8 91.5.0-1.el8_5
  • thunderbird Rocky Linux 8 91.5.0-1.el8_5

rocky linux advisories RLSA-2022:0130RLSA-2022:0129

  • firefox Alpine 3.23, Alpine 3.22, Alpine 3.21 +5 more 97.0-r0
  • librewolf Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 97.0-r0
  • firefox-esr Alpine 3.23, Alpine 3.22, Alpine 3.21 +6 more 91.5.0-r0
  • thunderbird Alpine 3.23, Alpine 3.22, Alpine 3.21 +5 more 91.5.0-r0

alpine advisories ALPINE-CVE-2022-22740

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2022-22740 updated cvss 8.8

Mozilla: Use-after-free of ChannelEventQueue::mOwner

  • Red Hat Enterprise Linux 6 firefox, thunderbird
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) firefox 91.5.0-1.el8_5, thunderbird 91.5.0-1.el8_5
    fixed: vendor fix RHSA-2022:0130
  • Red Hat Enterprise Linux AppStream E4S (v. 8.1) firefox 91.5.0-1.el8_1, thunderbird 91.5.0-1.el8_1
    fixed: vendor fix RHSA-2022:0125
  • Red Hat Enterprise Linux AppStream EUS (v. 8.2) firefox 91.5.0-1.el8_2, thunderbird 91.5.0-1.el8_2
    fixed: vendor fix RHSA-2022:0132
  • Red Hat Enterprise Linux AppStream EUS (v.8.4) firefox 91.5.0-1.el8_4, thunderbird 91.5.0-1.el8_4
    fixed: vendor fix RHSA-2022:0126
  • Red Hat Enterprise Linux Client (v. 7) firefox 91.5.0-1.el7_9, thunderbird 91.5.0-1.el7_9 Red Hat Enterprise Linux Client Optional (v. 7) firefox 91.5.0-1.el7_9 Red Hat Enterprise Linux Server (v. 7) firefox 91.5.0-1.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) firefox 91.5.0-1.el7_9, thunderbird 91.5.0-1.el7_9 Red Hat Enterprise Linux Workstation (v. 7) firefox 91.5.0-1.el7_9, thunderbird 91.5.0-1.el7_9 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 91.5.0-1.el7_9
    fixed: vendor fix RHSA-2022:0124

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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

1.01% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1742334 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

  • Mozilla Firefox ESR
  • Mozilla Firefox
  • Mozilla Thunderbird

Classification

Weakness

References

Sources

Fencer Vulns 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.