CVE-2020-1947Network attack vector

Remote code execution via unsafe YAML tags

Published Mar 11, 2020 · Updated Aug 4, 2024

Deserialization in Apache ShardingSphere 4.0.0-RC3 and 4.0.0 allows remote attackers to execute code through web-console YAML input. The web console passes datasource-configuration YAML to SnakeYAML, whose type tags instantiate attacker-selected Java classes without restricting trusted types. The console must be reachable, and successful exploitation runs code in the web console's server-side security context.

CVSS severity9.8
Critical
EPSS probability33.92%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization in Apache ShardingSphere 4.0.0-RC3 and 4.0.0 allows remote attackers to execute code through web-console YAML input. The web console passes datasource-configuration YAML to SnakeYAML, whose type tags instantiate attacker-selected Java classes without restricting trusted types. The console must be reachable, and successful exploitation runs code in the web console's server-side security context.

The record

CVE
CVE-2020-1947
Published
Mar 11, 2020
Updated
Aug 4, 2024
Vendor
Apache Software Foundation
Product
Apache ShardingSphere
Classifications
CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 11, 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

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Is a vulnerable build present?

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

  1. Affected versionversion=4.0.0
  2. Affected versionversion=4.0.0-RC3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apache Software Foundation · Apache ShardingSphereversion=4.0.0; version=4.0.0-RC3

Published CVSS scores

9.8OSVCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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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-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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