How severe is CVE-2021-30137?

CVE-2021-30137 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability high.

Is CVE-2021-30137 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-30137?

CVE-2021-30137 affects Axiossystems Assyst. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-30137?

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

When was CVE-2021-30137 published?

CVE-2021-30137 was published on 2021-09-15 and last updated on 2026-06-17.

CVE-2021-30137

CVE-2021-30137 is a high-severity vulnerability in Axiossystems Assyst with a CVSS 3.x base score of 7.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-611.

Key facts

Severity: High (CVSS 3.x base score 7.7)
CVSS v2: 6.4
EPSS exploit prediction: 1% (52nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-611
Affected product: Axiossystems Assyst
Published: 2021-09-15
Last modified: 2026-06-17

Description

Assyst 10 SP7.5 has authenticated XXE leading to SSRF via XML unmarshalling. The application allows users to send JSON or XML data to the server. It was possible to inject malicious XML data through several access points.

Frequently asked questions

What is CVE-2021-30137?: Assyst 10 SP7.5 has authenticated XXE leading to SSRF via XML unmarshalling. The application allows users to send JSON or XML data to the server. It was possible to inject malicious XML data through several access points.
How severe is CVE-2021-30137?: CVE-2021-30137 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability high.
Is CVE-2021-30137 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-30137?: CVE-2021-30137 affects Axiossystems Assyst. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-30137?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-30137 published?: CVE-2021-30137 was published on 2021-09-15 and last updated on 2026-06-17.

References

https://github.com/post-cyberlabs/CVE-Advisory/blob/main/CVE-2021-30137.pdf

Affected products (1)

cpe:2.3:a:axiossystems:assyst:10:sp7.5:*:*:*:*:*:*

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