What’s Vulnerable › Vulnerabilities
CVE-2020-15094: RCE in Symfony
- Severity: high (CVSS 8.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 3.0% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2020-09-02 · updated 2026-06-17
- Weakness: CWE-212
Description
In Symfony before versions 4.4.13 and 5.1.5, the CachingHttpClient class from the HttpClient Symfony component relies on the HttpCache class to handle requests. HttpCache uses internal headers like X-Body-Eval and X-Body-File to control the restoration of cached responses. The class was initially written with surrogate caching and ESI support in mind (all HTTP calls come from a trusted backend in that scenario). But when used by CachingHttpClient and if an attacker can control the response for a request being made by the CachingHttpClient, remote code execution is possible. This has been fixed in versions 4.4.13 and 5.1.5.
Affected products
- Fedoraproject Fedora: 32, 33
- Sensiolabs Httpclient: from 4.4.0 before 4.4.13; from 5.1.0 before 5.1.5 — fixed in 4.4.13, 5.1.5
- symfony: from 4.4.0 before 4.4.13; from 5.1.0 before 5.1.5 — fixed in 4.4.13, 5.1.5
- Packagist Symfony/Http-Kernel: from 4.3.0 before 4.4.13; from 5.0.0 before 5.1.5; v4.3.0, v4.3.1, v4.3.10, v4.3.11, v4.3.2, v4.3.3 (+42) — fixed in 4.4.13, 5.1.5
- Packagist Symfony/Symfony: from 4.3.0 before 4.4.13; from 5.0.0 before 5.1.5; v4.3.0, v4.3.1, v4.3.10, v4.3.11, v4.3.2, v4.3.3 (+42) — fixed in 4.4.13, 5.1.5
How to fix
Upgrade to a fixed version: Sensiolabs Httpclient 4.4.13, 5.1.5; symfony 4.4.13, 5.1.5; Packagist Symfony/Http-Kernel 4.4.13, 5.1.5; Packagist Symfony/Symfony 4.4.13, 5.1.5. Check the vendor advisory for mitigations.
References
- https://github.com/symfony/symfony/commit/d9910e0b33a2e0f993abff41c6fbc86951b66d78
- https://github.com/symfony/symfony/security/advisories/GHSA-754h-5r27-7x3r
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HNGUWOEETOFVH4PN3I3YO4QZHQ4AUKF3/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VAQJXAKWPMWB7OL6QPG2ZSEQZYYPU5RC/
- https://packagist.org/packages/symfony/http-kernel
- https://packagist.org/packages/symfony/symfony
- https://github.com/symfony/symfony/commit/d9910e0b33a2e0f993abff41c6fbc86951b66d78
- https://github.com/symfony/symfony/security/advisories/GHSA-754h-5r27-7x3r
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HNGUWOEETOFVH4PN3I3YO4QZHQ4AUKF3/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VAQJXAKWPMWB7OL6QPG2ZSEQZYYPU5RC/
- https://packagist.org/packages/symfony/http-kernel
- https://packagist.org/packages/symfony/symfony
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