Is CVE-2021-22946 in the CISA KEV catalog?

No. CVE-2021-22946 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-22946?

CVE-2021-22946 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-22946?

CVE-2021-22946 has an EPSS score of 4.22% (90th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-22946?

Upgrade curl on debian 11 to 7.74.0-1.3+deb11u2 or later. Fixes are available for 7 affected products.

CVE & CISA-KEV Catalog

CVE-2021-22946

HIGHEPSS 90th pctl

7.5

CVSS v3

NVD

Description

A user can tell curl >= 7.20.0 and <= 7.78.0 to require a successful upgrade to TLS when speaking to an IMAP, POP3 or FTP server (`--ssl-reqd` on the command line or`CURLOPT_USE_SSL` set to `CURLUSESSL_CONTROL` or `CURLUSESSL_ALL` withlibcurl). This requirement could be bypassed if the server would return a properly crafted but perfectly legitimate response.This flaw would then make curl silently continue its operations **withoutTLS** contrary to the instructions and expectations, exposing possibly sensitive data in clear text over the network.

CWE-325 CWE-319

How to fix

Remediation Available

curlDebian

Fixed in:7.74.0-1.3+deb11u2CVE-2021-22946

Fixed in:7.79.1-1CVE-2021-22946

curlUbuntu

Fixed in:7.35.0-1ubuntu2.20+esm8USN-5079-2

Fixed in:7.47.0-1ubuntu2.19+esm1USN-5079-2

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

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

libcurl3Ubuntu

Fixed in:7.35.0-1ubuntu2.20+esm8USN-5079-2

Fixed in:7.47.0-1ubuntu2.19+esm1USN-5079-2

libcurl3-gnutlsUbuntu

Fixed in:7.35.0-1ubuntu2.20+esm8USN-5079-2

Fixed in:7.47.0-1ubuntu2.19+esm1USN-5079-2

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

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

libcurl3-nssUbuntu

Fixed in:7.35.0-1ubuntu2.20+esm8USN-5079-2

Fixed in:7.47.0-1ubuntu2.19+esm1USN-5079-2

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

AvailabilityNone

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

Exploit Intelligence

4.22%probability of exploitation in 30 days

90thpercentile

Elevated risk: more likely to be exploited than 90% of all known CVEs.

References

Patch5

Third-Party Advisory11

Embed a live status badge for CVE-2021-22946

Markdown

[![CVE-2021-22946](https://tridentstack.com/cve/badge/CVE-2021-22946.svg)](https://tridentstack.com/cve/CVE-2021-22946)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-22946"><img src="https://tridentstack.com/cve/badge/CVE-2021-22946.svg" alt="CVE-2021-22946"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

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 2026-04-16.