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NVD / CVE Program· CNA mozilla

CVE-2022-31738: When exiting fullscreen mode, an iframe could have confused the browser about the current state of fullscreen, resulting in potential user c

Noroxi assessment

Priority: Monitor (action score 26/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.62% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: firefox-esr (Debian:10) 91.10.0esr-1~deb10u1; thunderbird (Debian:10) 1:91.10.0-1~deb10u1; firefox-esr (Debian:11) 91.10.0esr-1~deb11u1.

Low priority for now. Upgrade to firefox-esr (Debian:10) 91.10.0esr-1~deb10u1; thunderbird (Debian:10) 1:91.10.0-1~deb10u1; firefox-esr (Debian:11) 91.10.0esr-1~deb11u1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

When exiting fullscreen mode, an iframe could have confused the browser about the current state of fullscreen, resulting in potential user confusion or spoofing attacks. This vulnerability affects Thunderbird < 91.10, Firefox < 101, and Firefox ESR < 91.10.

MediumCVSS 6.5 · v3.1—No exploit Fix available
Published
Dec 22, 2022
Updated
Jun 17, 2026
EPSS
0.6% · 49th percentile

Report tools

JSON

Action score

26

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

CISA SSVC decision

Exploitation
proof of concept
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2022-31738

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
mozillafirefox
mozillafirefox esr
mozillathunderbird

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • mozilla firefoxbefore 101
  • mozilla firefox esrbefore 91.10
  • mozilla thunderbirdbefore 91.10

Versions reported by the vendor

Affected version ranges reported by the assigning authority (mozilla). Independent of NVD's CPE analysis and usually ahead of it.

  • Mozilla Firefox

    • unspecified and later · before 101affected

  • Mozilla Firefox ESR

    • unspecified and later · before 91.10affected

  • Mozilla Thunderbird

    • unspecified and later · before 91.10affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:10firefox-esrbefore 91.10.0esr-1~deb10u191.10.0esr-1~deb10u1
Debian:10thunderbirdbefore 1:91.10.0-1~deb10u11:91.10.0-1~deb10u1
Debian:11firefox-esrbefore 91.10.0esr-1~deb11u191.10.0esr-1~deb11u1
Debian:11thunderbirdbefore 1:91.10.0-1~deb11u11:91.10.0-1~deb11u1
Debian:12firefox-esrbefore 91.10.0esr-191.10.0esr-1
Debian:12thunderbirdbefore 1:91.10.0-11:91.10.0-1
Debian:9firefox-esrbefore 91.10.0esr-1~deb9u191.10.0esr-1~deb9u1
Debian:9thunderbirdbefore 1:91.10.0-1~deb9u11:91.10.0-1~deb9u1
openSUSE:Leap 15.3MozillaFirefoxbefore 91.10.0-150200.152.43.191.10.0-150200.152.43.1
openSUSE:Leap 15.3MozillaThunderbirdbefore 91.10.0-150200.8.73.191.10.0-150200.8.73.1
openSUSE:TumbleweedMozillaFirefoxbefore 101.0-1.1101.0-1.1
openSUSE:TumbleweedMozillaThunderbirdbefore 91.10.0-1.191.10.0-1.1
Red Hat:enterprise_linux:7::clientfirefoxbefore 0:91.10.0-1.el7_90:91.10.0-1.el7_9
Red Hat:enterprise_linux:7::clientfirefox-debuginfobefore 0:91.10.0-1.el7_90:91.10.0-1.el7_9
Red Hat:enterprise_linux:7::clientthunderbirdbefore 0:91.10.0-1.el7_90:91.10.0-1.el7_9
Red Hat:enterprise_linux:7::clientthunderbird-debuginfobefore 0:91.10.0-1.el7_90:91.10.0-1.el7_9
Red Hat:enterprise_linux:8::appstreamfirefoxbefore 0:91.10.0-1.el8_60:91.10.0-1.el8_6
Red Hat:enterprise_linux:8::appstreamfirefox-debuginfobefore 0:91.10.0-1.el8_60:91.10.0-1.el8_6
Red Hat:enterprise_linux:8::appstreamfirefox-debugsourcebefore 0:91.10.0-1.el8_60:91.10.0-1.el8_6
Red Hat:enterprise_linux:8::appstreamthunderbirdbefore 0:91.10.0-1.el8_60:91.10.0-1.el8_6
Red Hat:enterprise_linux:8::appstreamthunderbird-debuginfobefore 0:91.10.0-1.el8_60:91.10.0-1.el8_6
Red Hat:enterprise_linux:8::appstreamthunderbird-debugsourcebefore 0:91.10.0-1.el8_60:91.10.0-1.el8_6
Red Hat:enterprise_linux:9::appstreamfirefoxbefore 0:91.10.0-1.el9_00:91.10.0-1.el9_0
Red Hat:enterprise_linux:9::appstreamfirefox-debuginfobefore 0:91.10.0-1.el9_00:91.10.0-1.el9_0

+28

Same product

mozilla: all records

Other highest-scoring records for the same primary product.

  • CVE-2010-3765Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before 3.1.6 and 3.0.x before 3.0.10, and SeaMonkey 2.x befKEV
    94Now
  • CVE-2019-11708Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the non-sandboxeKEV
    87Now
  • CVE-2015-4495The PDF reader in Mozilla Firefox before 39.0.3, Firefox ESR 38.x before 38.1.1, and Firefox OS before 2.2 allows remote attackers to bypassKEV
    86Now

Published before and after this one in the same product

  • ← EarlierCVE-2022-31736Dec 22, 2022 · A malicious website could have learned the size of a cross-origin resource that supported Range requests.
    39Monitor
  • ← EarlierCVE-2022-31737Dec 22, 2022 · A malicious webpage could have caused an out-of-bounds write in WebGL, leading to memory corruption and a potentially exploitable crash.
    39Monitor
  • Later →CVE-2022-31739Dec 22, 2022 · When downloading files on Windows, the % character was not escaped, which could have lead to a download incorrectly being saved to attacker-
    35Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:firefox-esr91.10.0esr-1 · Debian:12Package registry (OSV)
debian:thunderbird1:91.10.0-1 · Debian:12Package registry (OSV)
opensuse:MozillaFirefox91.10.0-150200.152.43.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:MozillaThunderbird91.10.0-150200.8.73.1 · openSUSE:Leap 15.3Package registry (OSV)
red hat:firefox0:91.10.0-1.el7_9 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:firefox-debuginfo0:91.10.0-1.el7_9 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:firefox-debugsource0:91.10.0-1.el8_1 · Red Hat:rhel_e4s:8.1::appstreamPackage registry (OSV)
red hat:thunderbird0:91.10.0-1.el8_6 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:thunderbird-debuginfo0:91.10.0-1.el8_6 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:thunderbird-debugsource0:91.10.0-1.el8_6 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
rocky linux:firefox0:91.10.0-1.el8_6 · Rocky Linux:8Package registry (OSV)
rocky linux:thunderbird0:91.10.0-1.el8_6 · Rocky Linux:8Package registry (OSV)
suse:MozillaFirefox91.10.0-150200.152.43.1 · SUSE:Linux Enterprise Module for Desktop Applications 15 SP3Package registry (OSV)
suse:MozillaThunderbird91.10.0-150200.8.73.1 · SUSE:Linux Enterprise Module for Package Hub 15 SP3Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
high · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
None
Integrity impact
High
Availability impact
None

Weakness class (CWE)

CWE-290 · Authentication Bypass by Spoofing

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records