Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HCVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.
Summary
CVE-2024-28861 is a critical-severity Deserialization of Untrusted Data (CWE-502) vulnerability in Friendsofsymfony1 Symfony1. Its CVSS base score is 9.8 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique Junk Data (T1001.001); ranked in the top 25% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified map to SA-11 (Developer Testing and Evaluation) and SI-10 (Information Input Validation) — see the control section below for these in your framework.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
Symfony 1, a community-driven fork of the legacy 1.x branch of the Symfony PHP web framework, is affected by a deserialization vulnerability in the sfNamespacedParameterHolder class. The flaw exists in versions 1.1.0 through 1.5.18 and stems from an unsafe gadget chain that can be triggered when application code deserializes attacker-controlled data, as classified under CWE-502.
An unauthenticated remote attacker can supply a malicious serialized payload to any endpoint or component that performs untrusted deserialization. Successful exploitation yields arbitrary remote code execution with full impact on confidentiality, integrity, and availability, consistent with the CVSS 9.8 rating.
The official GitHub Security Advisory GHSA-pv9j-c53q-h433 and the referenced commit 0bd9d59c69221f49bfc8be8b871b79e12d7d171a state that version 1.5.19 contains the fix; developers are advised to upgrade and to avoid deserializing untrusted input. The associated EPSS score has remained low and stable near 0.07 with no material post-disclosure increase.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2024-0981
Vulnerability Data
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…
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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.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Developer testing and evaluation can uncover deserialization flaws before deployment.
Input validation directly stops deserialization of untrusted data by ensuring inputs are valid before processing.
Engineering principles such as safe deserialization and input sanitization structurally prevent the weakness from being introduced.
Integrity verification tools can detect malformed or tampered serialized data after the fact.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
PR.PS-02 addresses only post-deployment updates/patching and cannot prevent introduction of unsafe deserialization code, yet it can remediate some instances when the flaw exists in outdated libraries or components.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.