How severe is CVE-2020-25258?

CVE-2020-25258 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-2020-25258 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-25258?

CVE-2020-25258 affects Hyland Onbase. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-25258?

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-2020-25258 published?

CVE-2020-25258 was published on 2020-09-11 and last updated on 2026-06-17.

CVE-2020-25258

CVE-2020-25258 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: 2% (72nd 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 ASP.NET BinaryFormatter.Deserialize in a manner that allows attackers to transmit and execute bytecode in SOAP messages.

Frequently asked questions

What is CVE-2020-25258?: 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 ASP.NET BinaryFormatter.Deserialize in a manner that allows attackers to transmit and execute bytecode in SOAP messages.
How severe is CVE-2020-25258?: CVE-2020-25258 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-2020-25258 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-25258?: CVE-2020-25258 affects Hyland Onbase. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-25258?: 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-2020-25258 published?: CVE-2020-25258 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-2020-25259 — 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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