CVE-2018-11386: debian debian_linux Insufficient Session Expiration
Vulnerability summary
CVE-2018-11386 is a medium (CVSS 5.9) Insufficient Session Expiration vulnerability in debian debian_linux. EPSS estimates a 1.61% chance of exploitation in the next 30 days, higher than 75.5% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 1Timeline
- 13-06-2018PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated5.9MediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.9MediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
1.61%
Chance of exploitation in the next 30 days
Percentile
76%
Versus all other CVEs
30-day change
0.00 pp
From 1.61% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian2 products
- symfony< 3.4.12+dfsg-1
- debian_linuxEOL9.0
Sensiolabs1 product
- symfony≥ 2.7.0, < 2.7.48 | ≥ 2.8.0, < 2.8.41 | ≥ 3.3.0, < 3.3.17 | ≥ 3.4.0, < 3.4.11 | ≥ 4.0.0, < 4.0.11
Ubuntu1 product
- symfony< 3.4.6+dfsg-1ubuntu0.1
3 vendors · 4 products
References
11 links- symfony.com/blog/cve-2018-11386-denial-of-service-when-using-pdosessionhandlerX Refsource CONFIRMVendor AdvisoryREPORT
