How severe is CVE-2021-1626?

CVE-2021-1626 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-1626 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-1626?

CVE-2021-1626 affects Salesforce Mule. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-1626?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-1626 published?

CVE-2021-1626 was published on 2021-03-26 and last updated on 2026-06-17.

CVE-2021-1626

CVE-2021-1626 is a critical-severity vulnerability in Salesforce Mule with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Salesforce Mule
Published: 2021-03-26
Last modified: 2026-06-17

Description

MuleSoft is aware of a Remote Code Execution vulnerability affecting certain versions of a Mule runtime component that may affect both CloudHub and on-premise customers. Versions affected: Mule 4.1.x and 4.2.x runtime released before February 2, 2021.

Frequently asked questions

What is CVE-2021-1626?: MuleSoft is aware of a Remote Code Execution vulnerability affecting certain versions of a Mule runtime component that may affect both CloudHub and on-premise customers. Versions affected: Mule 4.1.x and 4.2.x runtime released before February 2, 2021.
How severe is CVE-2021-1626?: CVE-2021-1626 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-1626 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-1626?: CVE-2021-1626 affects Salesforce Mule. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-1626?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-1626 published?: CVE-2021-1626 was published on 2021-03-26 and last updated on 2026-06-17.

References

https://help.salesforce.com/articleView?id=000357382&type=1&mode=1

Affected products (1)

cpe:2.3:a:salesforce:mule:*:*:*:*:*:*:*:*

More vulnerabilities in Salesforce Mule

CVE-2021-1628 — Critical (CVSS 9.8): MuleSoft is aware of a XML External Entity (XXE) vulnerability affecting certain versions of a Mule runtime component…
CVE-2021-1627 — Critical (CVSS 9.8): MuleSoft is aware of a Server Side Request Forgery vulnerability affecting certain versions of a Mule runtime component…
CVE-2021-1630 — High (CVSS 7.5): XML external entity (XXE) vulnerability affecting certain versions of a Mule runtime component that may affect…

All CVEs affecting Salesforce Mule →