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CVE-2022-29916

MEDIUM
6.5
CVSS Score
Published: December 22, 2022 at 12:00 AM UTC
Updated: June 17, 2026 at 04:40 AM UTC
3 products affected across 1 vendorFirefoxThunderbirdFirefox ESR

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.8%
SSVC
No known exploit

Description

Firefox behaved slightly differently for already known resources when loading CSS resources involving CSS variables. This could have been used to probe the browser history. This vulnerability affects Thunderbird < 91.9, Firefox ESR < 91.9, and Firefox < 100.

Affected

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

Firefox· Mozilla
95%
v < 100
Affected range stops below 100, so it looks safe — our inference, not a vendor statement
Affected range stops below 100.0, so it looks safe — our inference, not a vendor statement
Firefox ESR· Mozilla
95%
v < 91.9
Affected range stops below 91.9, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
v < 91.9
Affected range stops below 91.9, so it looks safe — our inference, not a vendor statement

References (4)

ExploitIssue TrackingVendor Advisory
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1760674
ExploitVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2022-16/
ExploitVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2022-17/
ExploitVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2022-18/

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
NVD-CWE-noinfoCWE-200

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