How severe is CVE-2020-25259?

CVE-2020-25259 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-2020-25259 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-25259?

CVE-2020-25259 affects Hyland Onbase. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-25259?

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-2020-25259 published?

CVE-2020-25259 was published on 2020-09-11 and last updated on 2026-06-17.

CVE-2020-25259

CVE-2020-25259 is a critical-severity vulnerability in Hyland Onbase 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. The underlying weakness is classified as CWE-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (70th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-502
Affected product: Hyland Onbase
Published: 2020-09-11
Last modified: 2026-06-17

Description

An issue was discovered in Hyland OnBase 16.0.2.83 and below, 17.0.2.109 and below, 18.0.0.37 and below, 19.8.16.1000 and below and 20.3.10.1000 and below. It uses XML deserialization libraries in an unsafe manner.

Frequently asked questions

What is CVE-2020-25259?: An issue was discovered in Hyland OnBase 16.0.2.83 and below, 17.0.2.109 and below, 18.0.0.37 and below, 19.8.16.1000 and below and 20.3.10.1000 and below. It uses XML deserialization libraries in an unsafe manner.
How severe is CVE-2020-25259?: CVE-2020-25259 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-2020-25259 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-25259?: CVE-2020-25259 affects Hyland Onbase. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-25259?: 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-2020-25259 published?: CVE-2020-25259 was published on 2020-09-11 and last updated on 2026-06-17.

References

https://seclists.org/fulldisclosure/2020/Sep/22

Affected products (1)

cpe:2.3:a:hyland:onbase:*:*:*:*:*:*:*:*

More vulnerabilities in Hyland Onbase

CVE-2020-25260 — Critical (CVSS 9.8): An issue was discovered in Hyland OnBase 16.0.2.83 and below, 17.0.2.109 and below, 18.0.0.37 and below, 19.8.16.1000…
CVE-2020-25258 — Critical (CVSS 9.8): An issue was discovered in Hyland OnBase 16.0.2.83 and below, 17.0.2.109 and below, 18.0.0.37 and below, 19.8.16.1000…
CVE-2020-25257 — Critical (CVSS 9.8): An issue was discovered in Hyland OnBase 16.0.2.83 and below, 17.0.2.109 and below, 18.0.0.37 and below, 19.8.16.1000…
CVE-2020-25254 — Critical (CVSS 9.8): An issue was discovered in Hyland OnBase 16.0.2.83 and below, 17.0.2.109 and below, 18.0.0.37 and below, 19.8.16.1000…
CVE-2020-25253 — Critical (CVSS 9.8): An issue was discovered in Hyland OnBase 16.0.2.83 and below, 17.0.2.109 and below, 18.0.0.37 and below, 19.8.16.1000…
CVE-2020-25256 — Critical (CVSS 9.1): An issue was discovered in Hyland OnBase 16.0.2.83 and below, 17.0.2.109 and below, 18.0.0.37 and below, 19.8.16.1000…

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