How severe is CVE-2020-4377?

CVE-2020-4377 has a CVSS 3.x base score of 9.1, 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 none, and availability high.

Is CVE-2020-4377 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-4377?

CVE-2020-4377 primarily affects Ibm Cognos Analytics. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-4377?

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-2020-4377 published?

CVE-2020-4377 was published on 2020-08-03 and last updated on 2026-06-17.

CVE-2020-4377

CVE-2020-4377 is a critical-severity vulnerability in Ibm Cognos Analytics with a CVSS 3.x base score of 9.1. 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-611.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v2: 6.4
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-611
Affected product: Ibm Cognos Analytics
Published: 2020-08-03
Last modified: 2026-06-17

Description

IBM Cognos Anaytics 11.0 and 11.1 is vulnerable to an XML External Entity Injection (XXE) attack when processing XML data. A remote attacker could exploit this vulnerability to expose sensitive information or consume memory resources. IBM X-Force ID: 179156.

Frequently asked questions

What is CVE-2020-4377?: IBM Cognos Anaytics 11.0 and 11.1 is vulnerable to an XML External Entity Injection (XXE) attack when processing XML data. A remote attacker could exploit this vulnerability to expose sensitive information or consume memory resources. IBM X-Force ID: 179156.
How severe is CVE-2020-4377?: CVE-2020-4377 has a CVSS 3.x base score of 9.1, 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 none, and availability high.
Is CVE-2020-4377 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-4377?: CVE-2020-4377 primarily affects Ibm Cognos Analytics. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-4377?: 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-2020-4377 published?: CVE-2020-4377 was published on 2020-08-03 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:ibm:cognos_analytics:11.0.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:cognos_analytics:11.1.0:*:*:*:*:*:*:*

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