CVE-2021-34066Network attack vector

Unauthenticated command execution via crafted YAML upload

Published Aug 30, 2021 · Updated Aug 4, 2024

Unsafe YAML deserialization in EdgeGallery developer-be before 1.0 allows remote attackers to execute system commands through a crafted upload. The public record identifies the deployment-configuration upload path but does not disclose the parser call or object-construction chain that turns the crafted YAML into command execution. Network access to the unauthenticated upload path is sufficient; successful exploitation runs commands with the developer-be service's privileges.

CVSS severity9.8
Critical
EPSS probability1.96%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe YAML deserialization in EdgeGallery developer-be before 1.0 allows remote attackers to execute system commands through a crafted upload. The public record identifies the deployment-configuration upload path but does not disclose the parser call or object-construction chain that turns the crafted YAML into command execution. Network access to the unauthenticated upload path is sufficient; successful exploitation runs commands with the developer-be service's privileges.

The record

CVE
CVE-2021-34066
Published
Aug 30, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1059, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 30, 2021CVE 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1059Command and Scripting Interpreter
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

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Your stack

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