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CVE-2018-11386

21
FAUCET Score

CVE-2018-11386 is a denial-of-service vulnerability affecting the HttpFoundation component in various versions of Symfony (2.7.x, 2.8.x, 3.3.x, 3.4.x, and 4.0.x) when using the PDOSessionHandler. This flaw allows an attacker to disrupt a Symfony application with a crafted payload and minimal resources. Rated Medium severity (CVSS 5.9), it has a network attack vector and high attack complexity, leading to a high availability impact. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.7.0, < 2.7.48CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
>= 2.8.0, < 2.8.41CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
>= 3.3.0, < 3.3.17CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
>= 3.4.0, < 3.4.11CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
>= 4.0.0, < 4.0.11CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.9MEDIUM

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.61%
Probability of exploitation in next 30 days
EPSS Percentile
73.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0161 is in the 49th percentile among its peer group of 19,958 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (10)

composerpatch availablevia ghsa
Product: symfony/symfonyFixed in: 2.7.48
composerpatch availablevia ghsa
Product: symfony/symfonyFixed in: 2.8.41
composerpatch availablevia ghsa
Product: symfony/symfonyFixed in: 3.3.17
composerpatch availablevia ghsa
Product: symfony/symfonyFixed in: 3.4.11
composerpatch availablevia ghsa
Product: symfony/symfonyFixed in: 4.0.11
composerpatch availablevia ghsa
Product: symfony/http-foundationFixed in: 2.7.48
composerpatch availablevia ghsa
Product: symfony/http-foundationFixed in: 2.8.41
composerpatch availablevia ghsa
Product: symfony/http-foundationFixed in: 3.3.17
composerpatch availablevia ghsa
Product: symfony/http-foundationFixed in: 3.4.11
composerpatch availablevia ghsa
Product: symfony/http-foundationFixed in: 4.0.11

Vendor Advisories (1)

composerGHSA-r2rq-3h56-fqm4medium

Symfony DoS

May 14, 2022

References

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