How severe is CVE-2021-40510?

CVE-2021-40510 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-40510 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-40510?

CVE-2021-40510 affects Obdasystems Mastro. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-40510?

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-2021-40510 published?

CVE-2021-40510 was published on 2022-06-21 and last updated on 2026-06-17.

CVE-2021-40510

CVE-2021-40510 is a high-severity vulnerability in Obdasystems Mastro with a CVSS 3.x base score of 7.5. 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 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-611
Affected product: Obdasystems Mastro
Published: 2022-06-21
Last modified: 2026-06-17

Description

XML eXternal Entity (XXE) in OBDA systems’ Mastro 1.0 allows remote attackers to read system files via custom DTDs.

Frequently asked questions

What is CVE-2021-40510?: XML eXternal Entity (XXE) in OBDA systems’ Mastro 1.0 allows remote attackers to read system files via custom DTDs.
How severe is CVE-2021-40510?: CVE-2021-40510 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-40510 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-40510?: CVE-2021-40510 affects Obdasystems Mastro. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-40510?: 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-2021-40510 published?: CVE-2021-40510 was published on 2022-06-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:obdasystems:mastro:1.0:*:*:*:*:*:*:*

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