How severe is CVE-2020-12053?

CVE-2020-12053 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-2020-12053 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-12053?

CVE-2020-12053 affects Unisys Stealth. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-12053?

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-2020-12053 published?

CVE-2020-12053 was published on 2020-06-22 and last updated on 2026-06-17.

CVE-2020-12053

CVE-2020-12053 is a critical-severity vulnerability in Unisys Stealth 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-863.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-863
Affected product: Unisys Stealth
Published: 2020-06-22
Last modified: 2026-06-17

Description

In Unisys Stealth 3.4.x, 4.x and 5.x before 5.0.026, if certificate-based authorization is used without HTTPS, an endpoint could be authorized without a private key.

Frequently asked questions

What is CVE-2020-12053?: In Unisys Stealth 3.4.x, 4.x and 5.x before 5.0.026, if certificate-based authorization is used without HTTPS, an endpoint could be authorized without a private key.
How severe is CVE-2020-12053?: CVE-2020-12053 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-2020-12053 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-12053?: CVE-2020-12053 affects Unisys Stealth. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-12053?: 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-2020-12053 published?: CVE-2020-12053 was published on 2020-06-22 and last updated on 2026-06-17.

References

https://public.support.unisys.com/common/public/vulnerability/NVD_Detail_Rpt.aspx?ID=54

Affected products (1)

cpe:2.3:a:unisys:stealth:*:*:*:*:*:*:*:*

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