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Fencer Vulns
medium 4.3

CVE-2022-31745 json

If array shift operations are not used, the Garbage Collector may have become confused about valid objects.

published 2022-12-22 3 y ago modified 2026-06-17 4 mo ago also EUVD-2022-53143

cvss
4.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 30%
public exploits
0
none known

Summary

If array shift operations are not used, the Garbage Collector may have become confused about valid objects. This vulnerability affects Firefox < 101.

Patch / fix

  • Mozilla Firefox 101
  • firefox Ubuntu 18.04 LTS 101.0.1+build1-0ubuntu0.18.04.1
  • firefox Ubuntu 20.04 LTS 101.0.1+build1-0ubuntu0.20.04.1

ubuntu advisories UBUNTU-CVE-2022-31745

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 101.0-1.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:12121-1

  • firefox Alpine 3.23, Alpine 3.22, Alpine 3.21 +5 more 101.0-r0
  • librewolf Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 101.0-r0

alpine advisories ALPINE-CVE-2022-31745

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

  • firefox Arch Linux 101.0-1

arch linux advisories AVG-2760

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

0.37% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1760944 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
NVD 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
CNA 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Affected products

  • Mozilla Firefox

Classification

Weakness
  • CWE-129 Improper Validation of Array Index

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.