How severe is CVE-2019-18889?

CVE-2019-18889 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-18889 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 33% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-18889?

CVE-2019-18889 primarily affects Sensiolabs Symfony. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-18889?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2019-18889 published?

CVE-2019-18889 was published on 2019-11-21 and last updated on 2026-06-17.

CVE-2019-18889

CVE-2019-18889 is a critical-severity vulnerability in Sensiolabs Symfony with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 33% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-94.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 33% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-94
Affected product: Sensiolabs Symfony
Published: 2019-11-21
Last modified: 2026-06-17

Description

An issue was discovered in Symfony 3.4.0 through 3.4.34, 4.2.0 through 4.2.11, and 4.3.0 through 4.3.7. Serializing certain cache adapter interfaces could result in remote code injection. This is related to symfony/cache.

Frequently asked questions

What is CVE-2019-18889?: An issue was discovered in Symfony 3.4.0 through 3.4.34, 4.2.0 through 4.2.11, and 4.3.0 through 4.3.7. Serializing certain cache adapter interfaces could result in remote code injection. This is related to symfony/cache.
How severe is CVE-2019-18889?: CVE-2019-18889 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-18889 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 33% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-18889?: CVE-2019-18889 primarily affects Sensiolabs Symfony. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-18889?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2019-18889 published?: CVE-2019-18889 was published on 2019-11-21 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*

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