Is CVE-2021-20450 in the CISA KEV catalog?

No. CVE-2021-20450 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-20450?

CVE-2021-20450 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2021-20450?

CVE-2021-20450 has an EPSS score of 0.37% (29th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2021-20450?

No published fix for CVE-2021-20450 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2021-20450

MEDIUM

4.3

CVSS v3

NVD

Description

IBM Cognos Controller 10.4.1, 10.4.2, and 11.0.0 does not set the secure attribute on authorization tokens or session cookies. Attackers may be able to get the cookie values by sending a http:// link to a user or by planting this link in a site the user goes to. The cookie will be sent to the insecure link and the attacker can then obtain the cookie value by snooping the traffic. IBM X-Force ID: 196640.

CWE-565

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Exploit Intelligence

0.37%probability of exploitation in 30 days

29thpercentile

Low risk: more likely to be exploited than 29% of all known CVEs.

References

Vendor Advisory2

Related Vulnerabilities

Other CWE-565 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2026-0257	Critical	9.1	87%	KEV + Ransom	Fix
CVE-2023-35885	Critical	9.8	75%	-	Fix
CVE-2025-64447	High	8.1	7.5%	-	-
CVE-2008-5784	Critical	9.8	7.1%	-	-
CVE-2020-7070	Medium	4.3	5.0%	-	Fix
CVE-2019-7266	Critical	9.8	4.6%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-06-18.