Is CVE-2025-5265 in the CISA KEV catalog?

No. CVE-2025-5265 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-5265?

CVE-2025-5265 has a CVSS v3 base score of 4.8 (MEDIUM).

What is the EPSS score for CVE-2025-5265?

CVE-2025-5265 has an EPSS score of 0.14% (4th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-5265?

Upgrade thunderbird on ubuntu 22.04 to 1:128.12.0+build1-0ubuntu0.22.04.1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2025-5265

MEDIUM

4.8

CVSS v3

NVD

Description

Due to insufficient escaping of the ampersand character 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 bug only affects Firefox for Windows. Other versions of Firefox are unaffected.*. This vulnerability was fixed in Firefox 139, Firefox ESR 115.24, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11.

CWE-77Command Injection

How to fix

Remediation Available

thunderbirdUbuntu

Fixed in:1:128.12.0+build1-0ubuntu0.22.04.1USN-7663-1

DeveloperEditionWindows application

Affected:139.0Fixed in:139.0Mozilla

Affected:116.0 128.11.0Fixed in:128.11.0Mozilla

Affected:115.24.0Fixed in:115.24.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:115.24.0Fixed in:115.24.0Mozilla

Affected:116.0 128.11.0Fixed in:128.11.0Mozilla

Affected:139.0Fixed in:139.0Mozilla

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityLow

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

Exploit Intelligence

0.14%probability of exploitation in 30 days

4thpercentile

Low risk: more likely to be exploited than 4% of all known CVEs.

References

Vendor Advisory3

Other references3

Related Vulnerabilities

Other CWE-77 (Command Injection) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-3400	Critical	10.0	100%	KEV + Ransom	-
CVE-2024-21887	Critical	9.1	100%	KEV + Ransom	-
CVE-2023-1671	Critical	9.8	100%	KEV	Fix
CVE-2023-1389	High	8.8	100%	KEV	Fix
CVE-2021-1498	Critical	9.8	100%	KEV	Fix
CVE-2012-1823	Critical	9.8	100%	KEV	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-13.