CVE-2020-5220Network attack vector

API data exposure via unrestricted serialization groups

Published Jan 27, 2020 · Updated Aug 4, 2024

Information disclosure in Sylius ResourceBundle allows remote attackers to read unintended API fields through a crafted HTTP header. RequestConfigurationFactory accepts arbitrary serialization-group names from the header and applies them instead of restricting them to the route's serialization_groups or allowed_serialization_groups. The application must expose an API through a ResourceBundle controller, and a permissive group can reveal fields intended for a different API context.

CVSS severity5.3
Medium
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Information disclosure in Sylius ResourceBundle allows remote attackers to read unintended API fields through a crafted HTTP header. RequestConfigurationFactory accepts arbitrary serialization-group names from the header and applies them instead of restricting them to the route's serialization_groups or allowed_serialization_groups. The application must expose an API through a ResourceBundle controller, and a permissive group can reveal fields intended for a different API context.

The record

CVE
CVE-2020-5220
Published
Jan 27, 2020
Updated
Aug 4, 2024
Vendor
Sylius
Product
SyliusResourceBundle
Classifications
CWE-200, CWE-444, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 27, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.3.13
  2. Affected versionversion=>= 1.4.0, < 1.4.6
  3. Affected versionversion=>= 1.5.0, < 1.5.1
  4. Affected versionversion=>= 1.6.0, < 1.6.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Sylius · SyliusResourceBundleversion=< 1.3.13; version=>= 1.4.0, < 1.4.6; version=>= 1.5.0, < 1.5.1; version=>= 1.6.0, < 1.6.3

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
4.4GitHub CNACVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N
5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo