CVE-2022-27782Public exploitNetwork attack vector

Authentication bypass via incomplete connection reuse matching

Published Jun 1, 2022 · Updated May 27, 2026

Authentication bypass in libcurl within curl 7.16.1 through 7.83.0 allows remote attackers to reuse connections after TLS or SSH changes. Connection-pool matching omits ten TLS and SSH options, so a later transfer can inherit a connection established under different security settings. An application must perform sequential transfers while changing an omitted option; reuse can retain prior authentication or certificate-validation state.

CVSS severity7.5
High
EPSS probability2.93%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in libcurl within curl 7.16.1 through 7.83.0 allows remote attackers to reuse connections after TLS or SSH changes. Connection-pool matching omits ten TLS and SSH options, so a later transfer can inherit a connection established under different security settings. An application must perform sequential transfers while changing an omitted option; reuse can retain prior authentication or certificate-validation state.

The record

CVE
CVE-2022-27782
Published
Jun 1, 2022
Updated
May 27, 2026
Vendor
curl
Product
curl
Classifications
CWE-840, CWE-295, CWE-305
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 1, 2022CVE publishedPublication date reported by the CVE source.
  2. May 27, 2026Record 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

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:P/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-840Business Logic Errors
CWE-295Improper Certificate Validation
CWE-305Authentication Bypass by Primary Weakness

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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