CVE-2020-5255

MEDIUM EPSS 66.8%
Published Mar 30, 20206y ago · Modified Jun 17, 20262w ago
4.3 CVSS 3.1
Medium
Find Similar
Published Mar 30, 2020 6y ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
4.3
Exploitability
2.8
Impact
1.4
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability Low

Threat Intelligence

EPSS Exploit Probability
66.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 2

CWE-20 Improper Input Validation Validation
CWE-435

Affected Products 2

VendorProductVersionRange
sensiolabssymfony*≥4.4.0  –  <4.4.7
sensiolabssymfony*≥5.0.0  –  <5.0.7

References 4

  • github.com https://github.com/symfony/symfony/commit/dca343442e6a954f96a2609e7b4e9c21ed6d74e6
    PatchThird Party Advisory
  • github.com https://github.com/symfony/symfony/security/advisories/GHSA-mcx4-f5f5-4859
    Third Party Advisory
  • lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/C36JLPHUPKDFAX6D5WYFC4ALO2K7RDUQ/
  • symfony.com https://symfony.com/blog/cve-2020-5255-prevent-cache-poisoning-via-a-response-content-type-header
    Third Party Advisory

Remediation

  • github.com https://github.com/symfony/symfony/commit/dca343442e6a954f96a2609e7b4e9c21ed6d74e6
    PatchThird Party Advisory