CVE-2021-22946

HIGH

CVSS v3.1: 7.5 · EPSS: 0.0008 (23.2 percentile)

NetworkNo privilegesNo user interactionVendor advisory ref

Source data as of:

At a glance

Severity
HIGH
CVSS
7.5 v3.1 · NVD
EPSS
0.0008 (23.2 percentile) · FIRST.org
CISA KEV
No
Attack conditions (CVSS vector)
NetworkNo privilegesNo user interaction · Source: NVD Vector
Affected vendors
fedoraproject, siemens, oracle, haxx, splunk, netapp, apple, debian
Published
2021-09-29 · Modified: 2026-04-16
References
Jump to references (8)

CVSS / EPSS / KEV

CVSS v3.1 7.5 / 10 HIGH Source: NVD
EPSS 0.0008 23.2 percentile Source: FIRST.org
CISA KEV No Source: CISA

Source — CVSS: NVD · EPSS: FIRST.org · KEV: CISA. Data & Sources

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.

Record details

CVE ID
CVE-2021-22946
CVSS (v3.1)
7.5 (HIGH)
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Exploitability subscore
3.9
Impact subscore
3.6
EPSS
0.0008 (23.2 percentile) — 2026-04-17
CISA KEV
No
Weakness (CWE)
CWE-325, CWE-319
Affected vendors
fedoraproject, siemens, oracle, haxx, splunk, netapp, apple, debian
Affected configurations (CPE)
41
Published
2021-09-29
Modified
2026-04-16
Status
Modified

References

Reference URLs as listed by NVD, grouped by a mechanical match on the link's host/pattern. Labels describe the link type only.

Related records

Other records sharing a factual facet, for cross-reference. A descriptive neighbourhood — ordering does not imply priority and is not a recommendation.

Same affected vendor

CVE-2019-5481 CRITICAL CVSS 9.8 CVE-2020-8285 HIGH CVSS 7.5 CVE-2021-22922 MEDIUM CVSS 6.5 CVE-2021-22947 MEDIUM CVSS 5.9

Same weakness type (CWE)

CVE-2026-29142 MEDIUM CVSS 5.3 CVE-2026-33472 MEDIUM CVSS 4.8

Published the same year

CVE-2021-23840 HIGH CVSS 7.5 CVE-2021-3712 HIGH CVSS 7.4 CVE-2021-22922 MEDIUM CVSS 6.5 CVE-2021-22947 MEDIUM CVSS 5.9
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