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NVD / CVE Program· CNA hackerone

CVE-2022-43551: A vulnerability exists in curl <7.87.0 HSTS check that could be bypassed to trick it to keep using HTTP.

Noroxi assessment

Priority: Monitor (action score 35/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 16.5% (FIRST EPSS); higher than 97% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: curl (Alpine:v3.14) 7.79.1-r4; curl (Alpine:v3.15) 7.80.0-r5; curl (Alpine:v3.16) 7.83.1-r5.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to curl (Alpine:v3.14) 7.79.1-r4; curl (Alpine:v3.15) 7.80.0-r5; curl (Alpine:v3.16) 7.83.1-r5 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Dec 23, 2022
Updated
Oct 14, 2026
EPSS
16.5% · 97th percentile

Report tools

JSON

Action score

35

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
5 / 30 · 16.5%

CISA SSVC decision

Exploitation
proof of concept
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
7.5
CNA · hackerone
7.5
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
haxxcurl
fedoraprojectfedora
netappactive iq unified manager
netapponcommand insight
netapponcommand workflow automation
netappsnapcenter
splunkuniversal forwarder

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This vulnerability is about certificate validation or weak cryptography. The free SSL checker tests your certificate, enabled TLS versions and weak ciphers.

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Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • fedoraproject fedora37
  • haxx curl7.77.0 and later · before 7.87.0
  • netapp active iq unified managerall versions
  • netapp oncommand insightall versions
  • netapp oncommand workflow automationall versions
  • netapp snapcenterall versions
  • splunk universal forwarder8.2.0 and later · before 8.2.12
  • splunk universal forwarder9.0.0 and later · before 9.0.6
  • splunk universal forwarder9.1.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (hackerone). Independent of NVD's CPE analysis and usually ahead of it.

  • n/a https://github.com/curl/curl

    • Fixed in curl 7.87.0affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.14curlfrom 7.77.0 · before 7.79.1-r47.79.1-r4
Alpine:v3.15curlfrom 7.77.0 · before 7.80.0-r57.80.0-r5
Alpine:v3.16curlfrom 7.77.0 · before 7.83.1-r57.83.1-r5
Alpine:v3.17curlfrom 7.77.0 · before 7.87.0-r07.87.0-r0
Debian:12curlbefore 7.86.0-37.86.0-3
openSUSE:Leap Micro 5.3curlbefore 7.79.1-150400.5.12.17.79.1-150400.5.12.1
openSUSE:Tumbleweedcurlbefore 7.87.0-1.17.87.0-1.1
Red Hat:jboss_core_services:1::el7jbcs-httpd24-apr-utilbefore 0:1.6.1-101.el7jbcs0:1.6.1-101.el7jbcs
Red Hat:jboss_core_services:1::el7jbcs-httpd24-apr-util-debuginfobefore 0:1.6.1-101.el7jbcs0:1.6.1-101.el7jbcs
Red Hat:jboss_core_services:1::el7jbcs-httpd24-apr-util-develbefore 0:1.6.1-101.el7jbcs0:1.6.1-101.el7jbcs
Red Hat:jboss_core_services:1::el7jbcs-httpd24-apr-util-ldapbefore 0:1.6.1-101.el7jbcs0:1.6.1-101.el7jbcs
Red Hat:jboss_core_services:1::el7jbcs-httpd24-apr-util-mysqlbefore 0:1.6.1-101.el7jbcs0:1.6.1-101.el7jbcs
Red Hat:jboss_core_services:1::el7jbcs-httpd24-apr-util-nssbefore 0:1.6.1-101.el7jbcs0:1.6.1-101.el7jbcs
Red Hat:jboss_core_services:1::el7jbcs-httpd24-apr-util-odbcbefore 0:1.6.1-101.el7jbcs0:1.6.1-101.el7jbcs
Red Hat:jboss_core_services:1::el7jbcs-httpd24-apr-util-opensslbefore 0:1.6.1-101.el7jbcs0:1.6.1-101.el7jbcs
Red Hat:jboss_core_services:1::el7jbcs-httpd24-apr-util-pgsqlbefore 0:1.6.1-101.el7jbcs0:1.6.1-101.el7jbcs
Red Hat:jboss_core_services:1::el7jbcs-httpd24-apr-util-sqlitebefore 0:1.6.1-101.el7jbcs0:1.6.1-101.el7jbcs
Red Hat:jboss_core_services:1::el7jbcs-httpd24-curlbefore 0:8.0.1-1.el7jbcs0:8.0.1-1.el7jbcs
Red Hat:jboss_core_services:1::el7jbcs-httpd24-curl-debuginfobefore 0:8.0.1-1.el7jbcs0:8.0.1-1.el7jbcs
Red Hat:jboss_core_services:1::el7jbcs-httpd24-httpdbefore 0:2.4.51-39.el7jbcs0:2.4.51-39.el7jbcs
Red Hat:jboss_core_services:1::el7jbcs-httpd24-httpd-debuginfobefore 0:2.4.51-39.el7jbcs0:2.4.51-39.el7jbcs
Red Hat:jboss_core_services:1::el7jbcs-httpd24-httpd-develbefore 0:2.4.51-39.el7jbcs0:2.4.51-39.el7jbcs
Red Hat:jboss_core_services:1::el7jbcs-httpd24-httpd-manualbefore 0:2.4.51-39.el7jbcs0:2.4.51-39.el7jbcs
Red Hat:jboss_core_services:1::el7jbcs-httpd24-httpd-selinuxbefore 0:2.4.51-39.el7jbcs0:2.4.51-39.el7jbcs

+58

Same product

haxx: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-22901curl 7.75.0 through 7.76.1 suffers from a use-after-free vulnerability resulting in already freed memory being used when a TLS 1.3 session t
    51Plan
  • CVE-2023-38039When curl retrieves an HTTP response, it stores the incoming headers so that they can be accessed later via the libcurl headers API.
    47Plan
  • CVE-2024-2398HTTP/2 push headers memory-leak
    45Plan

Published before and after this one in the same product

  • ← EarlierCVE-2022-32221Dec 5, 2022 · When doing HTTP(S) transfers, libcurl might erroneously use the read callback (`CURLOPT_READFUNCTION`) to ask for data to send, even when th
    41Plan
  • ← EarlierCVE-2022-35260Dec 5, 2022 · curl can be told to parse a `.netrc` file for credentials.
    27Monitor
  • Later →CVE-2022-43552Feb 9, 2023 · A use after free vulnerability exists in curl <7.87.0.
    24Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:curl7.79.1-r4 · Alpine:v3.14Package registry (OSV)
debian:curl7.86.0-3 · Debian:12Package registry (OSV)
opensuse:curl7.79.1-150400.5.12.1 · openSUSE:Leap Micro 5.3Package registry (OSV)
red hat:jbcs-httpd24-httpd0:2.4.51-39.el7jbcs · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-httpd-debuginfo0:2.4.51-39.el7jbcs · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-httpd-devel0:2.4.51-39.el7jbcs · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-httpd-manual0:2.4.51-39.el7jbcs · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-httpd-selinux0:2.4.51-39.el7jbcs · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-httpd-tools0:2.4.51-39.el7jbcs · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-httpd-tools-debuginfo0:2.4.51-39.el8jbcs · Red Hat:jboss_core_services:1::el8Package registry (OSV)
red hat:jbcs-httpd24-mod_ldap0:2.4.51-39.el7jbcs · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-mod_ldap-debuginfo0:2.4.51-39.el8jbcs · Red Hat:jboss_core_services:1::el8Package registry (OSV)
red hat:jbcs-httpd24-mod_proxy_html1:2.4.51-39.el7jbcs · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-mod_session0:2.4.51-39.el7jbcs · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-mod_ssl1:2.4.51-39.el7jbcs · Red Hat:jboss_core_services:1::el7Package registry (OSV)
suse:curl7.79.1-150400.5.12.1 · SUSE:Linux Enterprise Micro 5.3Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-319 · Cleartext Transmission of Sensitive Information

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records