CVE-2021-1627Network attack vector

Unauthenticated SSRF via undisclosed runtime component

Published Mar 26, 2021 · Updated Aug 3, 2024

SSRF in Salesforce Mule Runtime Engine before February 2, 2021 allows remote attackers to initiate server-side network requests. The vendor identifies only an unspecified Mule runtime component and has not disclosed the request-processing locus or operation performed on attacker-controlled input. Unauthenticated network access is sufficient; reachable destinations and any resulting data exposure or internal-service effects remain undisclosed.

CVSS severity9.8
Critical
EPSS probability1.04%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Salesforce Mule Runtime Engine before February 2, 2021 allows remote attackers to initiate server-side network requests. The vendor identifies only an unspecified Mule runtime component and has not disclosed the request-processing locus or operation performed on attacker-controlled input. Unauthenticated network access is sufficient; reachable destinations and any resulting data exposure or internal-service effects remain undisclosed.

The record

CVE
CVE-2021-1627
Published
Mar 26, 2021
Updated
Aug 3, 2024
Vendor
Salesforce
Product
Mule Runtime Engine
Classifications
CWE-918, T1090
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

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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=Mule 3.8.x,3.9.x,4.x runtime released before February 2, 2021

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Salesforce · Mule Runtime Engineversion=Mule 3.8.x,3.9.x,4.x runtime released before February 2, 2021

Published CVSS scores

9.8NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST National Vulnerability DatabaseAV:N/AC:L/Au:N/C:P/I:P/A:P

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-918Server-Side Request Forgery (SSRF)
T1090Proxy

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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