CVE-2022-27780Public exploitNetwork attack vector

URL-filter bypass via decoded hostname separators

Published Jun 1, 2022 · Updated Aug 7, 2024

URL parsing in curl and libcurl 7.80.0 through 7.83.0 allows attackers to bypass URL filters via an encoded host separator. In lib/urlapi.c, hostname_check validates the decoded hostname against whitespace only, so separator bytes are later reinterpreted as path syntax. Exploitation requires an application to accept an attacker-influenced URL and rely on curl's parsed host for access-control or filtering decisions.

CVSS severity7.5
High
EPSS probability2.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

URL parsing in curl and libcurl 7.80.0 through 7.83.0 allows attackers to bypass URL filters via an encoded host separator. In lib/urlapi.c, hostname_check validates the decoded hostname against whitespace only, so separator bytes are later reinterpreted as path syntax. Exploitation requires an application to accept an attacker-influenced URL and rely on curl's parsed host for access-control or filtering decisions.

The record

CVE
CVE-2022-27780
Published
Jun 1, 2022
Updated
Aug 7, 2024
Vendor
NetApp
Product
NetApp SolidFire and HCI Management Node
Classifications
CWE-918, CWE-177
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 1, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 7, 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=0
  2. Affected versionversion=h300s
  3. Affected versionversion=h410s
  4. Affected versionversion=h500s
  5. Affected versionversion=h700s

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

NetApp · NetApp SolidFire and HCI Management Nodeversion=0; version=h300s; version=h410s; version=h500s; version=h700s
NetApp · ONTAPversion=0
NetApp · NetApp HCI Bootstrap OSversion=0
NetApp · NetApp SolidFire and HCI Storage Nodeversion=0
curl · curlversion=0 <7.86.0; version=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
5.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
CWE-177Improper Handling of URL Encoding (Hex Encoding)

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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