Devtools' preview ignored CSP headers
Published May 27, 2025
6.5
MEDIUMCVSS 3.1
EPSS 0.30%
Description
Previewing a response in Devtools ignored CSP headers, which could have allowed content injection attacks. This vulnerability was fixed in Firefox 139 and Thunderbird 139.
Affected products
No data.
No data.
Red Hat Enterprise Linux 10
firefox
Not affected
Red Hat Enterprise Linux 10
rhel10/firefox-flatpak
Not affected
Red Hat Enterprise Linux 6
firefox
Out of support scope
Red Hat Enterprise Linux 7
firefox
Not affected
Red Hat Enterprise Linux 8
firefox
Not affected
Red Hat Enterprise Linux 9
firefox
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 10 | firefox | Not affected | n/a |
| Red Hat Enterprise Linux 10 | rhel10/firefox-flatpak | Not affected | n/a |
| Red Hat Enterprise Linux 6 | firefox | Out of support scope | n/a |
| Red Hat Enterprise Linux 7 | firefox | Not affected | n/a |
| Red Hat Enterprise Linux 8 | firefox | Not affected | n/a |
| Red Hat Enterprise Linux 9 | firefox | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
1 other source (Red Hat) ▾
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed May 27, 2025 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
2025-2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed. Showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 0.30% (0.00305) | 21.12th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.25% (0.00247) | 15.68th | v5 (v2026.06.15) |
| May 28, 2025 | 0.04% (0.00037) | 9.98th | v4 (v2025.03.14) |
References (7)
- https://access.redhat.com/security/cve/CVE-2025-5271 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1920348 Permissions Required
- https://bugzilla.redhat.com/show_bug.cgi?id=2368753 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2025-5271
- https://www.cve.org/CVERecord?id=CVE-2025-5271
- https://www.mozilla.org/security/advisories/mfsa2025-42/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-45/
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2025-5271 | Vendor Advisory | |
| https://bugzilla.mozilla.org/show_bug.cgi?id=1920348 | Permissions Required | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2368753 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2025-5271 | ||
| https://www.cve.org/CVERecord?id=CVE-2025-5271 | ||
| https://www.mozilla.org/security/advisories/mfsa2025-42/ | Vendor Advisory | |
| https://www.mozilla.org/security/advisories/mfsa2025-45/ |
Change history (0)
No recorded changes yet.