CVE-2020-11066Network attack vector

Directory deletion and mail relay via object deserialization

Published May 13, 2020 · Updated Aug 4, 2024

Insecure deserialization in TYPO3 CMS 9.0.0 through 9.5.16 and 10.0.0 through 10.4.1 allows remote attackers to delete directories or relay email. Core ext:core passes malicious user-submitted content to PHP's unserialize(), allowing attacker-controlled object attributes to invoke class-destructor side effects. Exploitation requires another insecure-deserialization flaw; deletion is limited to directories writable by the web server, while email uses the site's identity.

CVSS severity8.7
High
EPSS probability1.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insecure deserialization in TYPO3 CMS 9.0.0 through 9.5.16 and 10.0.0 through 10.4.1 allows remote attackers to delete directories or relay email. Core ext:core passes malicious user-submitted content to PHP's unserialize(), allowing attacker-controlled object attributes to invoke class-destructor side effects. Exploitation requires another insecure-deserialization flaw; deletion is limited to directories writable by the web server, while email uses the site's identity.

The record

CVE
CVE-2020-11066
Published
May 13, 2020
Updated
Aug 4, 2024
Vendor
in2code GmbH
Product
TYPO3 CMS
Classifications
CWE-502, T1485
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 13, 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=>= 10.0.0, < 10.4.2
  2. Affected versionversion=>= 9.0.0, < 9.5.17

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

in2code GmbH · TYPO3 CMSversion=>= 10.0.0, < 10.4.2; version=>= 9.0.0, < 9.5.17

Published CVSS scores

8.7GitHub Security AdvisoryCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/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 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
T1485Data Destruction

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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