CVE-2022-45403

MEDIUM

6.5

CVSS Score

Published: December 22, 2022 at 12:00 AM UTC

Updated: June 17, 2026 at 05:10 AM UTC

3 products affected across 1 vendorFirefoxThunderbirdFirefox ESR

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Severity

MEDIUM6.5

Exploit prediction

EPSS 0.7%

SSVC

No known exploit

Description

Service Workers should not be able to infer information about opaque cross-origin responses; but timing information for cross-origin media combined with Range requests might have allowed them to determine the presence or length of a media file. This vulnerability affects Firefox ESR < 102.5, Thunderbird < 102.5, and Firefox < 107.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Firefox · Mozilla

95%

v < 107

Affected range stops below 107, so it looks safe — our inference, not a vendor statement

Affected range stops below 107.0, so it looks safe — our inference, not a vendor statement

Firefox ESR · Mozilla

95%

v < 102.5

Affected range stops below 102.5, so it looks safe — our inference, not a vendor statement

Thunderbird · Mozilla

95%

v < 102.5

Affected range stops below 102.5, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

Issue TrackingPermissions Required

Source: [email protected]

https://bugzilla.mozilla.org/show_bug.cgi?id=1762078

Vendor Advisory

Source: [email protected]

https://www.mozilla.org/security/advisories/mfsa2022-47/

Vendor Advisory

Source: [email protected]

https://www.mozilla.org/security/advisories/mfsa2022-48/

Vendor Advisory

Source: [email protected]

https://www.mozilla.org/security/advisories/mfsa2022-49/

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUMCISA-ADP

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: REQUIRED
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-203

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