Prevent cache poisoning via a Response Content-Type header
Published Mar 30, 2020
4.3
MEDIUMCVSS 3.1
EPSS 1.30%
Description
In Symfony before versions 4.4.7 and 5.0.7, when a `Response` does not contain a `Content-Type` header, affected versions of Symfony can fallback to the format defined in the `Accept` header of the request, leading to a possible mismatch between the response's content and `Content-Type` header. When the response is cached, this can prevent the use of the website by other users. This has been patched in versions 4.4.7 and 5.0.7.
Affected products
-
- Version >= 4.4.0 and < 4.4.7StatusaffectedConstraints-
- Version >= 5.0.0 and < 5.0.7StatusaffectedConstraints-
- Version
- ≥ 4.4.0 · < 4.4.7
- ≥ 5.0.0 · < 5.0.7
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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
1 other source (GHSA) ▾
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:S/C:N/I:N/A:P
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 4, 2026.
Score over time
2021-2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (13 key points)
Flat stretches are collapsed. Showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 4, 2026 | 1.30% (0.01297) | 69.39th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.30% (0.01297) | 66.52th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.38% (0.00379) | 57.27th | v4 (v2025.03.14) |
| Dec 17, 2024 | 0.09% (0.00087) | 38.68th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.18% (0.00176) | 54.10th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.12% (0.00124) | 45.07th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.95% (0.00950) | 32.28th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.95% (0.00950) | 28.61th | v2 (v2022.01.01) |
| Feb 4, 2022 | 8.13% (0.08128) | 82.07th | v2 (v2022.01.01) |
| Feb 3, 2022 | 4.77% (0.04773) | 77.96th | v1 |
| Jan 6, 2022 | 4.77% (0.04773) | 77.75th | v1 |
| Jan 5, 2022 | 1.10% (0.01105) | 67.44th | v5 (v2026.06.15) |
| Apr 14, 2021 | 1.10% (0.01105) | 0.00th | v1 |
References (10)
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/http-foundation/CVE-2020-5255.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2020-5255.yaml
- https://github.com/advisories/GHSA-mcx4-f5f5-4859 Advisory
- https://github.com/symfony/symfony/commit/dca343442e6a954f96a2609e7b4e9c21ed6d74e6 x_refsource_MISCPatchThird Party Advisory
- https://github.com/symfony/symfony/security/advisories/GHSA-mcx4-f5f5-4859 x_refsource_CONFIRMThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/C36JLPHUPKDFAX6D5WYFC4ALO2K7RDUQ/ vendor-advisoryx_refsource_FEDORA
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/C36JLPHUPKDFAX6D5WYFC4ALO2K7RDUQ/
- https://nvd.nist.gov/vuln/detail/CVE-2020-5255
- https://symfony.com/blog/cve-2020-5255-prevent-cache-poisoning-via-a-response-content-type-header x_refsource_MISCThird Party Advisory
- https://symfony.com/cve-2020-5255
Change history (0)
No recorded changes yet.