How severe is CVE-2020-26155?

CVE-2020-26155 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-26155 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-26155?

CVE-2020-26155 primarily affects Utimaco Block-safe Firmware. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-26155?

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-2020-26155 published?

CVE-2020-26155 was published on 2021-03-18 and last updated on 2026-06-17.

CVE-2020-26155

CVE-2020-26155 is a high-severity vulnerability in Utimaco Block-safe Firmware with a CVSS 3.x base score of 7.8. 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-427.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 4.4
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-427
Affected product: Utimaco Block-safe Firmware
Published: 2021-03-18
Last modified: 2026-06-17

Description

Multiple files and folders in Utimaco SecurityServer 4.20.0.4 and 4.31.1.0. are installed with Read/Write permissions for authenticated users, which allows for binaries to be manipulated by non-administrator users. Additionally, entries are made to the PATH environment variable which, in conjunction with these weak permissions, could enable an attacker to perform a DLL hijacking attack.

Frequently asked questions

What is CVE-2020-26155?: Multiple files and folders in Utimaco SecurityServer 4.20.0.4 and 4.31.1.0. are installed with Read/Write permissions for authenticated users, which allows for binaries to be manipulated by non-administrator users. Additionally, entries are made to the PATH environment variable which, in conjunction with these weak permissions, could enable an attacker to perform a DLL hijacking attack.
How severe is CVE-2020-26155?: CVE-2020-26155 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-26155 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-26155?: CVE-2020-26155 primarily affects Utimaco Block-safe Firmware. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-26155?: 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-2020-26155 published?: CVE-2020-26155 was published on 2021-03-18 and last updated on 2026-06-17.

References

Affected products (8)

cpe:2.3:o:utimaco:block-safe_firmware:2.0.0:*:*:*:*:*:*:*
cpe:2.3:o:utimaco:block-safe_firmware:3.0.0:*:*:*:*:*:*:*
cpe:2.3:o:utimaco:cryptoserver_cp5_firmware:5.0.0.0:*:*:*:*:*:*:*
cpe:2.3:o:utimaco:cryptoserver_cp5_firmware:5.1.0.0:*:*:*:*:*:*:*
cpe:2.3:o:utimaco:cryptoserver_cp5_vs-nfd_firmware:5.1.0.0:*:*:*:*:*:*:*
cpe:2.3:o:utimaco:paymentserver_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:utimaco:paymentserver_hybrid_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:utimaco:securityserver_firmware:*:*:*:*:*:*:*:*

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