CVE-2018-14773
An issue was discovered in Http Foundation in Symfony 2.7.0 through 2.7.48, 2.8.0 through 2.8.43, 3.3.0 through 3.3.17, 3.4.0 through 3.4.13, 4.0.0 through 4.0.13, and 4.1.0 through 4.1.2.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 57.6%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.
Description
An issue was discovered in Http Foundation in Symfony 2.7.0 through 2.7.48, 2.8.0 through 2.8.43, 3.3.0 through 3.3.17, 3.4.0 through 3.4.13, 4.0.0 through 4.0.13, and 4.1.0 through 4.1.2. It arises from support for a (legacy) IIS header that lets users override the path in the request URL via the X-Original-URL or X-Rewrite-URL HTTP request header. These headers are designed for IIS support, but it's not verified that the server is in fact running IIS, which means anybody who can send these requests to an application can trigger this. This affects \Symfony\Component\HttpFoundation\Request::prepareRequestUri() where X-Original-URL and X_REWRITE_URL are both used. The fix drops support for these methods so that they cannot be used as attack vectors such as web cache poisoning.
- CVSS 3.1
- 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 57.64% probability · 99th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Affected
- sensiolabs/symfony · debian/debian linux · drupal/drupal
- Source
- cve@mitre.org
EPSS 57.6% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securityfocus.com/bid/104943Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1041405Third Party Advisory, VDB Entry
- https://github.com/symfony/symfony/commit/e447e8b92148ddb3d1956b96638600ec95e08f6bIssue Tracking, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/03/msg00009.htmlMailing List, Third Party Advisory
- https://seclists.org/bugtraq/2019/May/21Issue Tracking, Mailing List, Third Party Advisory
- https://symfony.com/blog/cve-2018-14773-remove-support-for-legacy-and-risky-http-headersPatch, Vendor Advisory
- https://www.debian.org/security/2019/dsa-4441Third Party Advisory
- https://www.drupal.org/SA-CORE-2018-005Patch, Third Party Advisory
- http://www.securityfocus.com/bid/104943Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1041405Third Party Advisory, VDB Entry
- https://github.com/symfony/symfony/commit/e447e8b92148ddb3d1956b96638600ec95e08f6bIssue Tracking, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/03/msg00009.htmlMailing List, Third Party Advisory
- https://seclists.org/bugtraq/2019/May/21Issue Tracking, Mailing List, Third Party Advisory
- https://symfony.com/blog/cve-2018-14773-remove-support-for-legacy-and-risky-http-headersPatch, Vendor Advisory
- https://www.debian.org/security/2019/dsa-4441Third Party Advisory
- https://www.drupal.org/SA-CORE-2018-005Patch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.