How severe is CVE-2020-4877?

CVE-2020-4877 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-2020-4877 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-4877?

CVE-2020-4877 primarily affects Ibm Cognos Controller. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-4877?

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-2020-4877 published?

CVE-2020-4877 was published on 2022-01-21 and last updated on 2026-06-17.

CVE-2020-4877

CVE-2020-4877 is a critical-severity vulnerability in Ibm Cognos Controller 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% (55th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-863
Affected product: Ibm Cognos Controller
Published: 2022-01-21
Last modified: 2026-06-17

Description

IBM Cognos Controller 10.4.0, 10.4.1, and 10.4.2 could be vulnerable to unauthorized modifications by using public fields in public classes. IBM X-Force ID: 190843.

Frequently asked questions

What is CVE-2020-4877?: IBM Cognos Controller 10.4.0, 10.4.1, and 10.4.2 could be vulnerable to unauthorized modifications by using public fields in public classes. IBM X-Force ID: 190843.
How severe is CVE-2020-4877?: CVE-2020-4877 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-2020-4877 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-4877?: CVE-2020-4877 primarily affects Ibm Cognos Controller. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-4877?: 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-2020-4877 published?: CVE-2020-4877 was published on 2022-01-21 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:ibm:cognos_controller:10.4.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:cognos_controller:10.4.1:*:*:*:*:*:*:*
cpe:2.3:a:ibm:cognos_controller:10.4.2:*:*:*:*:*:*:*

More vulnerabilities in Ibm Cognos Controller

CVE-2020-4879 — Critical (CVSS 9.8): IBM Cognos Controller 10.4.0, 10.4.1, and 10.4.2 could allow a remote attacker to bypass security restrictions, caused…
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CVE-2023-47160 — High (CVSS 8.2): IBM Cognos Controller 11.0.0 through 11.0.1 FP3 and IBM Controller 11.1.0 is vulnerable to an XML External Entity…
CVE-2024-40702 — High (CVSS 8.2): IBM Cognos Controller 11.0.0 through 11.0.1 and IBM Controller 11.1.0 could allow an unauthorized user to obtain valid…
CVE-2020-4876 — High (CVSS 8.2): IBM Cognos Controller 10.4.0, 10.4.1, and 10.4.2 is vulnerable to an XML External Entity Injection (XXE) attack when…

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Other CWE-863 (Incorrect Authorization) vulnerabilities

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CVE-2026-46595 — Critical (CVSS 10.0): Previously, CVE-2024-45337 fixed an authorization bypass for misused ssh server configurations; if any other type of…
CVE-2026-33105 — Critical (CVSS 10.0): Improper authorization in Microsoft Azure Kubernetes Service allows an unauthorized attacker to elevate privileges over…
CVE-2026-32213 — Critical (CVSS 10.0): Improper authorization in Azure AI Foundry allows an unauthorized attacker to elevate privileges over a network.

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