CVE-2022-43551

What it is

A vulnerability exists in curl <7.87.0 HSTS check that could be bypassed to trick it to keep using HTTP. Using its HSTS support, curl can be instructed to use HTTPS instead of using an insecure clear-text HTTP step even when HTTP is provided in the URL. However, the HSTS mechanism could be bypassed if the host name in the given URL first uses IDN characters that get replaced to ASCII counterparts as part of the IDN conversion. Like using the character UTF-8 U+3002 (IDEOGRAPHIC FULL STOP) instead of the common ASCII full stop (U+002E) `.`. Then in a subsequent request, it does not detect the HSTS state and makes a clear text transfer. Because it would store the info IDN encoded but look for it IDN decoded.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data exposure.

Exploit odds

16.6% chance of exploitation in the next 30 days (EPSS). Higher than most.

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2022-10-20 00:00 UTC ReservedThe CVE id was reserved by its CNA
2. 2022-12-23 15:15 UTC PublishedDisclosed publicly on CVE.org and NVD
3. 2026-10-14 19:16 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 16.6% in the next 30 days (EPSS).
• Severity: 7.5 HIGH (CVSS).
• Fix: none linked yet, which raises it.

Details

Published

2022-12-23 15:15 UTC

Last modified

2026-10-14 19:16 UTC

Exploit probability

16.6% · EPSS, next 30 days

Weakness

CWE-319 · Cleartext transmission

Record status

Modified

Affected

• Haxx Curl < 7.87.0
• Fedoraproject Fedora 37
• Netapp Active Iq Unified Manager
• Netapp Oncommand Insight
• Netapp Oncommand Workflow Automation
• Netapp Snapcenter
• Splunk Universal Forwarder < 8.2.12
• Splunk Universal Forwarder < 9.0.6

Attack profile CVSS 3.1 · 7.5

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2022-43551.md and follow it. Check whether this project is affected by CVE-2022-43551. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

Copy as ticket · More options · Status badge