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HIGH

CVE-2022-22740

CVSS v3

8.8

HIGH

EPSS Score

1.0 %

exploit probability, as of 2026-10-22

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • firefoxAlmaLinux:8all versions · fixed in 91.5.0-1.el8_5.almaand 1 other package

Vendor advisories

  • CVE-2022-22740 Red Hat Product Security164 products fixed · 4 known affected

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

    firefox as a component of Red Hat Enterprise Linux 6 · firefox.src as a component of Red Hat Enterprise Linux 6 · thunderbird as a component of Red Hat Enterprise Linux 6

  • RHSA-2022:0127 Red Hat Product Security11 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2022:0124 Red Hat Product Security18 products fixed

    Red Hat Security Advisory: firefox security update

  • RHSA-2022:0129 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2022:0128 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2022:0132 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: firefox security update

5 more advisories

Full record on NVD

Description

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.

Technical details

Published
2022-12-22

Frequently asked questions

What is CVE-2022-22740?

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.

Is CVE-2022-22740 actively exploited?

Active exploitation of CVE-2022-22740 has not been confirmed. Its EPSS score was 1.0% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2022-22740?

CVE-2022-22740 has a CVSS v3 base score of 8.8 (HIGH severity).

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