What is CVE-2020-4877?

CVE-2020-4877 is a critical-severity vulnerability in IBM Cognos Controller, classified under Incorrect Authorization. CVSS score: 9.8/10. Published 2022-01-21.

How severe is CVE-2020-4877?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in IBM Cognos Controller

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.

Vulnerability class: Broken Access Control

Published 2022-01-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (58.9th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 58.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

IBM Cognos Controller — versions 10.4.0, 10.4.1, 10.4.2
IBM Cognos Controller — versions 10.4.0, 10.4.1, 10.4.2
Microsoft Windows

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

www.ibm.com/support/pages/node/6509856 (Vendor Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/190843 (VDB Entry, vdb-entry, Vendor Advisory)

Frequently asked questions

What is CVE-2020-4877?: CVE-2020-4877 is a critical-severity vulnerability in IBM Cognos Controller, classified under Incorrect Authorization. CVSS score: 9.8/10. Published 2022-01-21.
How severe is CVE-2020-4877?: Critical severity. CVSS v3 base score is 9.8 out of 10.