CVE-2022-435517.5HighCWE-319

CVE-2022-43551: Haxx https://github.com/curl/curl vulnerability

Haxx · https://github.com/curl/curl

Vendor fix available · Affected: Haxx https://github.com/curl/curl · Exploitation: likely to be exploited (10% or more)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

16.6%probability of exploitation in the next 30 days

97th percentile

050100

Higher than 97% of scored CVEs

7.5HighCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

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.

Affected products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

https://github.com/curl/curlFixed in curl 7.87.0

On the Atlas

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Exploitation: Likely to be exploited (10% or more). EPSS gives it a 10% or higher chance of exploitation in the next 30 days.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Cleartext Transmission of Sensitive Information · Cryptography
Vendor: Haxx
Published: December 2022
Band: Likely to be exploited (10% or more), December 2022
Bounty reports: 4 disclosed on HackerOne

Disclosed bug bounty reports about CVE-2022-43551

The reports on HackerOne that name this CVE, with HackerOne's own outcome. Titles and metadata only.

no_proxy IDN mismatch: Unicode hostnames bypass proxy exclusion listcurl · 2026Informative
curl tool: --hsts is ignored for a schemeless URL starting with a slash under --proto-default httpcurl · 2026 · low severityInformative
CVE-2022-43551: Another HSTS bypass via IDNInternet Bug Bounty · 2023 · medium severityValid
CVE-2022-43551: Another HSTS bypass via IDNcurl · 2022 · medium severityValid

CoverageNo articles yet

No CyberSIXT article names CVE-2022-43551 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.