Is CVE-2021-22945 in the CISA KEV catalog?

No. CVE-2021-22945 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-22945?

CVE-2021-22945 has a CVSS v3 base score of 9.1 (CRITICAL).

What is the EPSS score for CVE-2021-22945?

CVE-2021-22945 has an EPSS score of 6.22% (93th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-22945?

Upgrade curl on debian 11 to 7.74.0-1.3+deb11u2 or later. Fixes are available for 6 affected products.

CVE & CISA-KEV Catalog

CVE-2021-22945

CRITICALEPSS 93th pctl

9.1

CVSS v3

NVD

Description

When sending data to an MQTT server, libcurl <= 7.73.0 and 7.78.0 could in some circumstances erroneously keep a pointer to an already freed memory area and both use that again in a subsequent call to send data and also free it *again*.

CWE-415

How to fix

Remediation Available

curlDebian

Fixed in:7.74.0-1.3+deb11u2CVE-2021-22945

Fixed in:7.79.1-1CVE-2021-22945

curlUbuntu

Fixed in:7.58.0-2ubuntu3.15USN-5079-1

Fixed in:7.68.0-1ubuntu2.7USN-5079-1

libcurl3-gnutlsUbuntu

Fixed in:7.58.0-2ubuntu3.15USN-5079-1

Fixed in:7.68.0-1ubuntu2.7USN-5079-1

libcurl3-nssUbuntu

Fixed in:7.58.0-2ubuntu3.15USN-5079-1

Fixed in:7.68.0-1ubuntu2.7USN-5079-1

libcurl4Ubuntu

Fixed in:7.58.0-2ubuntu3.15USN-5079-1

Fixed in:7.68.0-1ubuntu2.7USN-5079-1

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.

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

ConfidentialityHigh

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

6.22%probability of exploitation in 30 days

93rdpercentile

High risk: more likely to be exploited than 93% of all known CVEs.

References

Patch3

Third-Party Advisory7

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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 2025-06-09.