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CVE-2025-4089

Potential local code execution in "copy as cURL" command

MEDIUM
5.1
CVSS Score
Published: April 29, 2025 at 01:13 PM UTC
Updated: September 30, 2026 at 06:10 PM UTC
2 products affected across 1 vendorFirefoxThunderbird

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Severity
MEDIUM5.1
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

Due to insufficient escaping of special characters in the "copy as cURL" feature, an attacker could trick a user into using this command, potentially leading to local code execution on the user's system. This vulnerability affects Firefox < 138 and Thunderbird < 138.

Affected

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

Firefox· Mozilla
95%
v < 138.0
Vendor states this is fixed in 138 (unaffected)
Affected range stops below 138.0, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
v < 138.0
Vendor states this is fixed in 138 (unaffected)
Affected range stops below 138.0, 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 (3)

Broken Link
Source: [email protected]
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1949994%2C1956698%2C1960198
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2025-28/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2025-31/

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

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

CVSS

5.1MEDIUMCISA-ADP
Attack Vector
LOCAL
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-77

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