CVE-2021-1626Network attack vector

Unauthenticated remote code execution

Published Mar 26, 2021 · Updated Aug 3, 2024

Remote code execution in Salesforce Mule Runtime Engine 4.1.x and 4.2.x releases before February 2, 2021 allows remote attackers to execute code. The vendor identifies only an unspecified Mule runtime component and has not published the vulnerable code path or untrusted input operation. Network reachability is sufficient, with no authentication or user interaction required; successful exploitation compromises the runtime host.

CVSS severity9.8
Critical
EPSS probability2.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Remote code execution in Salesforce Mule Runtime Engine 4.1.x and 4.2.x releases before February 2, 2021 allows remote attackers to execute code. The vendor identifies only an unspecified Mule runtime component and has not published the vulnerable code path or untrusted input operation. Network reachability is sufficient, with no authentication or user interaction required; successful exploitation compromises the runtime host.

The record

CVE
CVE-2021-1626
Published
Mar 26, 2021
Updated
Aug 3, 2024
Vendor
Salesforce
Product
Mule Runtime Engine
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 26, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=Mule 4.1.x and 4.2.x runtime released before February 2, 2021

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Salesforce · Mule Runtime Engineversion=Mule 4.1.x and 4.2.x runtime released before February 2, 2021

Published CVSS scores

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS: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

No sourced classifications are available.

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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