How severe is CVE-2024-28861?

CVE-2024-28861 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-2024-28861 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-28861?

CVE-2024-28861 affects Friendsofsymfony1 Symfony1. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-28861?

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.

Does CVE-2024-28861 have an EU (EUVD) identifier?

Yes. CVE-2024-28861 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-0981.

When was CVE-2024-28861 published?

CVE-2024-28861 was published on 2024-03-22 and last updated on 2026-06-17.

CVE-2024-28861

CVE-2024-28861 is a critical-severity vulnerability in Friendsofsymfony1 Symfony1 with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-0981
Weakness: CWE-502
Affected product: Friendsofsymfony1 Symfony1
Published: 2024-03-22
Last modified: 2026-06-17

Description

Symfony 1 is a community-driven fork of the 1.x branch of Symfony, a PHP framework for web projects. Starting in version 1.1.0 and prior to version 1.5.19, Symfony 1 has a gadget chain due to dangerous deserialization in `sfNamespacedParameterHolder` class that would enable an attacker to get remote code execution if a developer deserializes user input in their project. Version 1.5.19 contains a patch for the issue.

Frequently asked questions

What is CVE-2024-28861?: Symfony 1 is a community-driven fork of the 1.x branch of Symfony, a PHP framework for web projects. Starting in version 1.1.0 and prior to version 1.5.19, Symfony 1 has a gadget chain due to dangerous deserialization in `sfNamespacedParameterHolder` class that would enable an attacker to get remote code execution if a developer deserializes user input in their project. Version 1.5.19 contains a patch for the issue.
How severe is CVE-2024-28861?: CVE-2024-28861 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-2024-28861 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-28861?: CVE-2024-28861 affects Friendsofsymfony1 Symfony1. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-28861?: 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.
Does CVE-2024-28861 have an EU (EUVD) identifier?: Yes. CVE-2024-28861 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-0981.
When was CVE-2024-28861 published?: CVE-2024-28861 was published on 2024-03-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:friendsofsymfony1:symfony1:*:*:*:*:*:*:*:*

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