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-325CWE-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
Fixed in:7.79.1-1CVE-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:8.2.0 8.2.12Fixed in:8.2.12Splunk, Inc.
Affected:9.0.0 9.0.6Fixed in:9.0.6Splunk, 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

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

Related Vulnerabilities

Other CWE-325 vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2020-15086Critical9.82.7%-Fix
CVE-2021-33560High7.52.3%-Fix
CVE-2020-15098High8.82.2%-Fix
CVE-2019-3738Medium6.51.7%-Fix
CVE-2016-9574Medium5.91.4%-Fix
CVE-2022-30115Medium4.31.1%-Fix
Embed a live status badge for CVE-2021-22946
CVE-2021-22946 severity badge

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.

See how it worksStart freeThis CVE lookup is free and always will be.

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.