CVE-2021-1630Network attack vector

Data disclosure via external XML entity processing

Published Aug 5, 2021 · Updated Aug 3, 2024

XXE in a Mule runtime component in Salesforce Mule Runtime Engine 3.x and 4.x released before June 8, 2021 allows remote attackers to read data. Salesforce has not published the affected parser or the operation that permits resolution of attacker-controlled external entities. A network-reachable Mule application must pass attacker-controlled XML to the affected component; the documented consequence is data disclosure without integrity or availability impact.

CVSS severity7.5
High
EPSS probability1.07%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

XXE in a Mule runtime component in Salesforce Mule Runtime Engine 3.x and 4.x released before June 8, 2021 allows remote attackers to read data. Salesforce has not published the affected parser or the operation that permits resolution of attacker-controlled external entities. A network-reachable Mule application must pass attacker-controlled XML to the affected component; the documented consequence is data disclosure without integrity or availability impact.

The record

CVE
CVE-2021-1630
Published
Aug 5, 2021
Updated
Aug 3, 2024
Vendor
Salesforce
Product
Mule Runtime Engine
Classifications
CWE-611, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 5, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=MuleSoft Mule CE/EE 3.x and 4.x released before June 8, 2021

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Salesforce · Mule Runtime Engineversion=MuleSoft Mule CE/EE 3.x and 4.x released before June 8, 2021

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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-611Improper Restriction of XML External Entity Reference
T1005Data from Local System

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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