CVE-2020-7655Network attack vector

Request smuggling via invalid header-name parsing

Published May 21, 2020 · Updated Aug 4, 2024

HTTP request smuggling in Hive Solutions Netius before 1.17.58 allows remote attackers to desynchronize HTTP message boundaries. HTTPParser._parse_headers accepted non-RFC field-name characters because it checked surrounding whitespace rather than validating every token character. Exploitation requires another HTTP peer to interpret the crafted CL:TE or TE:TE request differently, enabling request or response misrouting.

CVSS severity6.1
Medium
EPSS probability0.82%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTTP request smuggling in Hive Solutions Netius before 1.17.58 allows remote attackers to desynchronize HTTP message boundaries. HTTPParser._parse_headers accepted non-RFC field-name characters because it checked surrounding whitespace rather than validating every token character. Exploitation requires another HTTP peer to interpret the crafted CL:TE or TE:TE request differently, enabling request or response misrouting.

The record

CVE
CVE-2020-7655
Published
May 21, 2020
Updated
Aug 4, 2024
Vendor
Hive Solutions
Product
Netius
Classifications
CWE-444, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 21, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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=All versions prior to 1.17.58

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Hive Solutions · Netiusversion=All versions prior to 1.17.58

Published CVSS scores

5.3GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NVDAV:N/AC:M/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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