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CVE-2022-42916

HIGH
7.5
CVSS Score
Published: October 29, 2022 at 12:00 AM UTC
Updated: October 14, 2026 at 07:16 PM UTC
4 products affected across 4 vendorsmacOSFedoraCurl

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Severity
HIGH7.5
Exploit prediction
EPSS 3%
SSVC
No known exploit

Description

In curl before 7.86.0, the HSTS check could be bypassed to trick it into staying with HTTP. Using its HSTS support, curl can be instructed to use HTTPS directly (instead of using an insecure cleartext HTTP step) even when HTTP is provided in the URL. This mechanism could be bypassed if the host name in the given URL uses IDN characters that get replaced with ASCII counterparts as part of the IDN conversion, e.g., using the character UTF-8 U+3002 (IDEOGRAPHIC FULL STOP) instead of the common ASCII full stop of U+002E (.). The earliest affected version is 7.77.0 2021-05-26.

Affected

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

macOS· Apple
95%
v < 12.6.313.0 ≤ v < 13.2
Affected range stops below 12.6.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 13.2, so it looks safe — our inference, not a vendor statement
Fedora· Fedora Projectrpm
95%
353637
Curl· Haxx
95%
7.77.0 ≤ v < 7.86.0
Affected range stops below 7.86.0, so it looks safe — our inference, not a vendor statement
Universal Forwarder· Splunk
95%
8.2.0 ≤ v < 8.2.129.0.0 ≤ v < 9.0.69.1.0
Affected range stops below 8.2.12, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.0.6, so it looks safe — our inference, not a vendor statement

References (13)

Mailing ListThird Party Advisory
Source: [email protected]
http://seclists.org/fulldisclosure/2023/Jan/19
Mailing ListThird Party Advisory
Source: [email protected]
http://seclists.org/fulldisclosure/2023/Jan/20
Mailing ListThird Party Advisory
Source: [email protected]
http://www.openwall.com/lists/oss-security/2022/12/21/1
Vendor Advisory
Source: [email protected]
https://curl.se/docs/CVE-2022-42916.html
Vendor AdvisoryMailing ListThird Party Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/37YEVVC6NAF6H7UHH6YAUY5QEVY6LIH2/
Vendor AdvisoryMailing ListThird Party Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVU3IMZCKR4VE6KJ4GCWRL2ILLC6OV76/
Vendor AdvisoryMailing ListThird Party Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Q27V5YYMXUVI6PRZQVECON32XPVWTKDK/
Vendor AdvisoryThird Party Advisory
Source: [email protected]
https://security.gentoo.org/glsa/202212-01

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial 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-319

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