How severe is CVE-2021-20455?

CVE-2021-20455 has a CVSS 3.x base score of 3.7, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2021-20455 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20455?

CVE-2021-20455 primarily affects Ibm Cognos Controller. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-20455?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2021-20455 have an EU (EUVD) identifier?

Yes. CVE-2021-20455 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-7873.

When was CVE-2021-20455 published?

CVE-2021-20455 was published on 2025-01-07 and last updated on 2026-06-17.

CVE-2021-20455

CVE-2021-20455 is a low-severity vulnerability in Ibm Cognos Controller with a CVSS 3.x base score of 3.7. 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-209.

Key facts

Severity: Low (CVSS 3.x base score 3.7)
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2021-7873
Weakness: CWE-209
Affected product: Ibm Cognos Controller
Published: 2025-01-07
Last modified: 2026-06-17

Description

IBM Cognos Controller 11.0.0 through 11.0.1 and IBM Controller 11.1.0 could allow a remote attacker to obtain sensitive information when a detailed technical error message is returned in the browser. This information could be used in further attacks against the system.

Frequently asked questions

What is CVE-2021-20455?: IBM Cognos Controller 11.0.0 through 11.0.1 and IBM Controller 11.1.0 could allow a remote attacker to obtain sensitive information when a detailed technical error message is returned in the browser. This information could be used in further attacks against the system.
How severe is CVE-2021-20455?: CVE-2021-20455 has a CVSS 3.x base score of 3.7, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2021-20455 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20455?: CVE-2021-20455 primarily affects Ibm Cognos Controller. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-20455?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2021-20455 have an EU (EUVD) identifier?: Yes. CVE-2021-20455 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-7873.
When was CVE-2021-20455 published?: CVE-2021-20455 was published on 2025-01-07 and last updated on 2026-06-17.

References

https://www.ibm.com/support/pages/node/7179163

Affected products (2)

cpe:2.3:a:ibm:cognos_controller:*:*:*:*:*:*:*:*
cpe:2.3:a:ibm:controller:11.1.0:*:*:*:*:*:*:*

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…
CVE-2020-4877 — Critical (CVSS 9.8): IBM Cognos Controller 10.4.0, 10.4.1, and 10.4.2 could be vulnerable to unauthorized modifications by using public…
CVE-2024-28777 — High (CVSS 8.8): IBM Cognos Controller 11.0.0 through 11.0.1 FP3 and IBM Controller 11.1.0 is vulnerable to unrestricted…
CVE-2024-52902 — High (CVSS 8.8): IBM Cognos Controller 11.0.0 through 11.0.1 FP3 and IBM Controller 11.1.0 client application contains hard coded…
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…

All CVEs affecting Ibm Cognos Controller →

Other CWE-209 (Generation of Error Message Containing Sensitive Information) vulnerabilities

CVE-2025-62168 — Critical (CVSS 10.0): Squid is a caching proxy for the Web. In Squid versions prior to 7.2, a failure to redact HTTP authentication…
CVE-2025-68110 — Critical (CVSS 9.9): ChurchCRM is an open-source church management system. Versions prior to 6.5.3 may disclose database information in an…
CVE-2025-46658 — Critical (CVSS 9.8): An issue was discovered in ExonautWeb in 4C Strategies Exonaut 21.6. There are verbose error messages.
CVE-2024-28285 — Critical (CVSS 9.8): A Fault Injection vulnerability in the SymmetricDecrypt function in cryptopp/elgamal.h of Cryptopp Crypto++ 8.9, allows…
CVE-2023-40767 — Critical (CVSS 9.8): User enumeration is found in in PHPJabbers Make an Offer Widget v1.0. This issue occurs during password recovery, where…
CVE-2023-40766 — Critical (CVSS 9.8): User enumeration is found in in PHPJabbers Ticket Support Script v3.2. This issue occurs during password recovery,…

Browse all CWE-209 (Generation of Error Message Containing Sensitive Information) vulnerabilities →