Is CVE-2021-22897 in the CISA KEV catalog?

No. CVE-2021-22897 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-22897?

CVE-2021-22897 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2021-22897?

CVE-2021-22897 has an EPSS score of 2.98% (86th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-22897?

Upgrade UniversalForwarder to 9.0.6 or later.

CVE & CISA-KEV Catalog

CVE-2021-22897

MEDIUMEPSS 86th pctl

5.3

CVSS v3

NVD

Description

curl 7.61.0 through 7.76.1 suffers from exposure of data element to wrong session due to a mistake in the code for CURLOPT_SSL_CIPHER_LIST when libcurl is built to use the Schannel TLS library. The selected cipher set was stored in a single "static" variable in the library, which has the surprising side-effect that if an application sets up multiple concurrent transfers, the last one that sets the ciphers will accidentally control the set used by all transfers. In a worst-case scenario, this weakens transport security significantly.

CWE-840 CWE-668

How to fix

Remediation Available

UniversalForwarderWindows application

Affected:9.0.0 9.0.6Fixed in:9.0.6Splunk, Inc.

Affected:8.2.0 8.2.12Fixed in:8.2.12Splunk, Inc.

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

2.98%probability of exploitation in 30 days

86thpercentile

Elevated risk: more likely to be exploited than 86% of all known CVEs.

References

Patch6

Exploit1

hackerone.com

Third-Party Advisory1

security.netapp.com

Related Vulnerabilities

Other CWE-840 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-22926	High	7.5	9.8%	-	Fix
CVE-2022-32207	Critical	9.8	6.8%	-	Fix
CVE-2022-32208	Medium	5.9	6.8%	-	Fix
CVE-2021-22922	Medium	6.5	4.3%	-	Fix
CVE-2022-27782	High	7.5	2.6%	-	Fix
CVE-2020-8228	Medium	5.3	1.9%	-	-

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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 2026-05-28.