HOMEVULNERABILITIESCVE-2018-14773
MEDIUM

CVE-2018-14773

NVD-CWE-noinfoPublished: August 3, 2018· Updated: Jun 17, 2026

6.5
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2018-14773 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 6.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Affected Vendors & Products

Debian1 product(s)
debian linux
Drupal1 product(s)
drupal
sensiolabs1 product(s)
symfony
Source: NVD CPE · 4 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/symfony/symfony/commit/e447e8b92148ddb3d1956b96638600ec95e08f6b
PATCHhttps://symfony.com/blog/cve-2018-14773-remove-support-for-legacy-and-risky-http-headers
PATCHhttps://www.drupal.org/SA-CORE-2018-005
PATCHhttps://github.com/symfony/symfony/commit/e447e8b92148ddb3d1956b96638600ec95e08f6b
PATCHhttps://symfony.com/blog/cve-2018-14773-remove-support-for-legacy-and-risky-http-headers
PATCHhttps://www.drupal.org/SA-CORE-2018-005
ADVISORYhttp://www.securityfocus.com/bid/104943
ADVISORYhttp://www.securitytracker.com/id/1041405
ADVISORYhttps://lists.debian.org/debian-lts-announce/2019/03/msg00009.html
ADVISORYhttps://seclists.org/bugtraq/2019/May/21
ADVISORYhttps://www.debian.org/security/2019/dsa-4441
ADVISORYhttp://www.securityfocus.com/bid/104943
ADVISORYhttp://www.securitytracker.com/id/1041405
ADVISORYhttps://lists.debian.org/debian-lts-announce/2019/03/msg00009.html
ADVISORYhttps://seclists.org/bugtraq/2019/May/21
ADVISORYhttps://www.debian.org/security/2019/dsa-4441

All References (16)

→
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

Quick Facts

CVE IDCVE-2018-14773
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessNVD-CWE-noinfo
CISA KEVNo
Affected3 vendor(s)
PublishedAug 3, 2018

Related CVEs (NVD-CWE-noinfo)

CVE-2010-3554
10.0
CVE-2010-3556
10.0
CVE-2010-3398
10.0
CVE-2010-3553
10.0
CVE-2012-1398
10.0
CVE-2010-3558
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2018-14773 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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