CVE-2021-22946

HIGH

curl >=7.20.0-7.78.0 - Info Disclosure

Title source: llm
STIX 2.1

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.

References (16)

Core 16
Core References
Mailing List, Third Party Advisory mailing-list
https://lists.debian.org/debian-lts-announce/2021/09/msg00022.html
Mailing List, Third Party Advisory mailing-list
http://seclists.org/fulldisclosure/2022/Mar/29
Third Party Advisory vendor-advisory
https://www.debian.org/security/2022/dsa-5197
Mailing List, Third Party Advisory mailing-list
https://lists.debian.org/debian-lts-announce/2022/08/msg00017.html
Third Party Advisory vendor-advisory
https://security.gentoo.org/glsa/202212-01
Exploit, Issue Tracking, Patch, Third Party Advisory
https://hackerone.com/reports/1334111
Release Notes, Third Party Advisory
https://support.apple.com/kb/HT213183

Scores

CVSS v3 7.5
EPSS 0.0006
EPSS Percentile 19.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-319 CWE-325
Status published
Products (40)
None/https://github.com/curl/curl curl 7.20.0 to and including 7.78.0
apple/macos < 12.3
debian/debian_linux 9.0
debian/debian_linux 10.0
debian/debian_linux 11.0
fedoraproject/fedora 33
fedoraproject/fedora 35
haxx/curl 7.20.0 - 7.79.0
netapp/cloud_backup
netapp/clustered_data_ontap
... and 30 more
Published Sep 29, 2021
Tracked Since Feb 18, 2026