HOMEVULNERABILITIESCVE-2018-11386
MEDIUM

CVE-2018-11386

CWE-613Published: June 13, 2018· Updated: Jun 17, 2026

5.9
CVSS v3.1

Official Description

An issue was discovered in the HttpFoundation component in Symfony 2.7.x before 2.7.48, 2.8.x before 2.8.41, 3.3.x before 3.3.17, 3.4.x before 3.4.11, and 4.0.x before 4.0.11. The PDOSessionHandler class allows storing sessions on a PDO connection. Under some configurations and with a well-crafted payload, it was possible to do a denial of service on a Symfony application without too much resources.

NVD Source

Technical Analysis

CVE-2018-11386 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 5.9.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

Debian1 product(s)
debian linux
sensiolabs1 product(s)
symfony
Source: NVD CPE · 2 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

ADVISORYhttps://symfony.com/blog/cve-2018-11386-denial-of-service-when-using-pdosessionhandler
ADVISORYhttps://www.debian.org/security/2018/dsa-4262
ADVISORYhttps://symfony.com/blog/cve-2018-11386-denial-of-service-when-using-pdosessionhandler
ADVISORYhttps://www.debian.org/security/2018/dsa-4262

All References (10)

→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G4XNBMFW33H47O5TZGA7JYCVLDBCXAJV/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UBQK7JDXIELADIPGZIOUCZKMAJM5LSBW/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WU5N2TZFNGXDGMXMPP7LZCWTFLENF6WH/
→
https://symfony.com/blog/cve-2018-11386-denial-of-service-when-using-pdosessionhandlerVendor Advisory
→
https://www.debian.org/security/2018/dsa-4262Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G4XNBMFW33H47O5TZGA7JYCVLDBCXAJV/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UBQK7JDXIELADIPGZIOUCZKMAJM5LSBW/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WU5N2TZFNGXDGMXMPP7LZCWTFLENF6WH/
→
https://symfony.com/blog/cve-2018-11386-denial-of-service-when-using-pdosessionhandlerVendor Advisory
→
https://www.debian.org/security/2018/dsa-4262Third Party Advisory

Quick Facts

CVE IDCVE-2018-11386
CVSS Score5.9 / 10
SeverityMEDIUM
WeaknessCWE-613
CISA KEVNo
Affected2 vendor(s)
PublishedJun 13, 2018

Related CVEs (CWE-613)

CVE-2014-2595
9.8
CVE-2020-27422
9.8
CVE-2024-42447
9.8
CVE-2024-27782
9.8
CVE-2024-41827
9.8
CVE-2024-43685
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2018-11386 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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