Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2019-18889

49
FAUCET Score

CVE-2019-18889 is a critical remote code injection vulnerability affecting Symfony versions 3.4.0-3.4.34, 4.2.0-4.2.11, and 4.3.0-4.3.7, specifically related to the symfony/cache component. This flaw allows an unauthenticated attacker to execute arbitrary code by serializing certain cache adapter interfaces. With a CVSS score of 9.8 (Critical), it poses a severe risk of complete compromise (confidentiality, integrity, and availability). While there is no evidence of active exploitation or public exploit code, the vulnerability has garnered significant community discussion, indicating awareness and potential for future exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
>= 3.4.0, <= 3.4.34CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
>= 4.2.0, <= 4.2.11CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
>= 4.3.0, <= 4.3.7CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
31CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
33.25%
Probability of exploitation in next 30 days
EPSS Percentile
98.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.3325 is in the 95th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (6)

composerpatch availablevia ghsa
Product: symfony/cacheFixed in: 3.4.35
composerpatch availablevia ghsa
Product: symfony/cacheFixed in: 4.2.12
composerpatch availablevia ghsa
Product: symfony/cacheFixed in: 4.3.8
composerpatch availablevia ghsa
Product: symfony/symfonyFixed in: 3.4.35
composerpatch availablevia ghsa
Product: symfony/symfonyFixed in: 4.2.12
composerpatch availablevia ghsa
Product: symfony/symfonyFixed in: 4.3.8

Vendor Advisories (1)

composerGHSA-79gr-58r3-pwm3critical

Symfony Unsafe Cache Serialization Could Enable RCE

Dec 2, 2019

References

github.com / symfony/symfony/releases/tag/v4.3.8
Release Notes
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/UED22BOXTL2SSFMGYKA64ZFHGLLJG3EA
symfony.com / blog/cve-2019-18889-forbid-serializing-abstractadapter-and-tagawareadapter-instances
Vendor Advisory
symfony.com / blog/symfony-4-3-8-released
Release Notes