FragmentListener in the HttpKernel component in Symfony 2.3.19 through 2.3.28, 2.4.9 through 2.4.10, 2.5.4 through 2.5.11, and 2.6.0 through 2.6.7, when ESI or SSI support enabled, does not check if the _controller attribute is set, which allows remote attackers to bypass URL signing and security rules by including (1) no hash or (2) an invalid hash in a request to /_fragment
Published Jun 2, 2015
4.3
MEDIUMCVSS 2.0
EPSS 8.21%
Description
FragmentListener in the HttpKernel component in Symfony 2.3.19 through 2.3.28, 2.4.9 through 2.4.10, 2.5.4 through 2.5.11, and 2.6.0 through 2.6.7, when ESI or SSI support enabled, does not check if the _controller attribute is set, which allows remote attackers to bypass URL signing and security rules by including (1) no hash or (2) an invalid hash in a request to /_fragment.
Affected products
No data.
- 2.3.19
- 2.3.20
- 2.3.21
- 2.3.22
- 2.3.23
- 2.3.24
- 2.3.25
- 2.3.26
- 2.3.27
- 2.3.28
- 2.4.9
- 2.4.10
- 2.5.4
- 2.5.5
- 2.5.6
- 2.5.7
- 2.5.8
- 2.5.9
- 2.5.10
- 2.5.11
- 2.6.0
- 2.6.1
- 2.6.3
- 2.6.4
- 2.6.5
- 2.6.6
- 2.6.7
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:N/I:P/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (19 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 8.21% (0.08211) | 94.72th | v5 (v2026.06.15) |
| Jun 15, 2026 | 8.27% (0.08269) | 94.18th | v5 (v2026.06.15) |
| May 17, 2025 | 77.16% (0.77158) | 98.90th | v4 (v2025.03.14) |
| Mar 30, 2025 | 73.27% (0.73268) | 98.72th | v4 (v2025.03.14) |
| Mar 29, 2025 | 82.99% (0.82993) | 99.06th | v4 (v2025.03.14) |
| Mar 26, 2025 | 73.27% (0.73268) | 98.73th | v4 (v2025.03.14) |
| Mar 24, 2025 | 64.16% (0.64161) | 98.31th | v4 (v2025.03.14) |
| Mar 23, 2025 | 73.27% (0.73268) | 98.70th | v4 (v2025.03.14) |
| Mar 19, 2025 | 64.16% (0.64161) | 98.25th | v4 (v2025.03.14) |
| Mar 18, 2025 | 25.33% (0.25328) | 95.78th | v4 (v2025.03.14) |
| Mar 17, 2025 | 64.16% (0.64161) | 98.28th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.60% (0.00598) | 79.14th | v3 (v2023.03.01) |
| Mar 22, 2024 | 0.60% (0.00598) | 77.96th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.85% (0.00847) | 81.61th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.85% (0.00847) | 79.59th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.32% (0.01319) | 71.27th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.32% (0.01319) | 71.23th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.32% (0.01319) | 69.22th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.32% (0.01319) | 44.98th | v2 (v2022.01.01) |
References (12)
- http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159513.html vendor-advisoryx_refsource_FEDORA
- http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159603.html vendor-advisoryx_refsource_FEDORA
- http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159610.html vendor-advisoryx_refsource_FEDORA
- http://symfony.com/blog/cve-2015-4050-esi-unauthorized-access x_refsource_CONFIRMVendor Advisory
- http://www.debian.org/security/2015/dsa-3276 vendor-advisoryx_refsource_DEBIAN
- http://www.securityfocus.com/bid/74928 vdb-entryx_refsource_BID
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/http-kernel/CVE-2015-4050.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2015-4050.yaml
- https://github.com/advisories/GHSA-qmqw-mpqp-mr54 Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2015-4050
- https://symfony.com/cve-2015-4050
- https://web.archive.org/web/20200228090443/http://www.securityfocus.com/bid/74928
Change history (0)
No recorded changes yet.