CVE-2020-13929Network attack vector

Unauthenticated user impersonation via conflicting anonymous access

Published Sep 2, 2021 · Updated Aug 4, 2024

Authentication bypass in Apache Zeppelin 0.9.0 and earlier allows remote attackers to act as another user via network requests. The zeppelin-server authentication path honors zeppelin.anonymous.allowed even when Apache Shiro is configured, admitting requests without the configured identity check. A network-reachable deployment with Shiro and anonymous access enabled permits notebook changes under the impersonated identity.

CVSS severity7.5
High
EPSS probability3.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Apache Zeppelin 0.9.0 and earlier allows remote attackers to act as another user via network requests. The zeppelin-server authentication path honors zeppelin.anonymous.allowed even when Apache Shiro is configured, admitting requests without the configured identity check. A network-reachable deployment with Shiro and anonymous access enabled permits notebook changes under the impersonated identity.

The record

CVE
CVE-2020-13929
Published
Sep 2, 2021
Updated
Aug 4, 2024
Vendor
The Apache Software Foundation
Product
Apache Zeppelin
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 2, 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?

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

  1. Affected versionversion=Apache Zeppelin <=0.9.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Zeppelinversion=Apache Zeppelin <=0.9.0

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:P/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 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

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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