CVE-2022-30115Public exploitNetwork attack vector

Cleartext disclosure via trailing-dot HSTS bypass

Published Jun 1, 2022 · Updated Aug 3, 2024

Cleartext transmission in curl 7.82.0 through 7.83.0 allows context-dependent attackers to read HTTP traffic after an HSTS bypass. The HSTS code in lib/hsts.c compares cache entries and URL hostnames without consistently removing a trailing dot, so equivalent hostnames can miss the HTTPS upgrade. Exploitation requires HSTS use, a trailing-dot mismatch between the cached and requested hostname, and access to observe the resulting cleartext connection.

CVSS severity4.3
Medium
EPSS probability1.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cleartext transmission in curl 7.82.0 through 7.83.0 allows context-dependent attackers to read HTTP traffic after an HSTS bypass. The HSTS code in lib/hsts.c compares cache entries and URL hostnames without consistently removing a trailing dot, so equivalent hostnames can miss the HTTPS upgrade. Exploitation requires HSTS use, a trailing-dot mismatch between the cached and requested hostname, and access to observe the resulting cleartext connection.

The record

CVE
CVE-2022-30115
Published
Jun 1, 2022
Updated
Aug 3, 2024
Vendor
curl
Product
curl
Classifications
CWE-319, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 1, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Fixed in 7.83.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

curl · curlversion=Fixed in 7.83.1

Published CVSS scores

4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
4.0NIST NVDAV:N/AC:L/Au:S/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-319Cleartext Transmission of Sensitive Information
T1557Adversary-in-the-Middle

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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