vulntracker.iovulntracker.io
© 2026 vulntracker.io

CVE-2021-22946

HIGH
7.5
CVSS Score
Published: September 29, 2021 at 12:00 AM UTC
Updated: October 14, 2026 at 12:17 PM UTC
29 products affected across 8 vendorsmacOSDebian LinuxFedora· also runs on 8 platforms

Using https://github.com/curl/curl by N/A?

Get instant alerts when new vulnerabilities affect https://github.com/curl/curl - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Start FreeSign In
Severity
HIGH7.5
Exploit prediction
EPSS 5%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

macOS· Apple
95%
v < 12.3
Affected range stops below 12.3, so it looks safe — our inference, not a vendor statement
Debian Linux· Debiandrupal
95%
10.011.09.0
Fedora· Fedora Projectrpm
95%
3335
Curl· Haxx
95%
7.20.0 ≤ v < 7.79.0curl 7.20.0 to and including 7.78.0
Affected range stops below 7.79.0, so it looks safe — our inference, not a vendor statement
Cloud Backup· NetAppdrupal
95%
All versions
Clustered Data ONTAP· NetApp
95%
All versions
H300E Firmware· NetAppdrupal
95%
All versions
netapp-h300e (same device)
H300S Firmware· NetAppdrupal
95%
All versions
netapp-h300s (same device)
H410S Firmware· NetAppdrupal
95%
All versions
netapp-h410s (same device)
H500E Firmware· NetAppdrupal
95%
All versions
netapp-h500e (same device)

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

References (19)

Mailing ListThird Party Advisory
Source: [email protected]
http://seclists.org/fulldisclosure/2022/Mar/29
x_refsource_CONFIRMPatchThird Party Advisory
Source: [email protected]
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
ExploitIssue TrackingPatchThird Party Advisory
Source: [email protected]
https://hackerone.com/reports/1334111
Mailing ListThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2021/09/msg00022.html
Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2022/08/msg00017.html
Vendor AdvisoryMailing ListThird Party Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APOAK4X73EJTAPTSVT7IRVDMUWVXNWGD/
Vendor AdvisoryMailing ListThird Party Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RWLEC6YVEM2HWUBX67SDGPSY4CQB72OE/
Vendor AdvisoryThird Party Advisory
Source: [email protected]
https://security.gentoo.org/glsa/202212-01

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-325CWE-319

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create accountSign in
Free plan, no card