CVE-2021-43106Public exploitNetwork attack vector

User redirection via trusted Host header

Published Feb 14, 2022 · Updated Aug 4, 2024

Host-header injection in Compass Plus TranzWare Online 5.3.33.3 F38 and FIMI 4.2.19.4 25 allows remote attackers to redirect users. The FIMI web interface trusts an attacker-supplied HTTP Host value and copies it into the Location header of a 302 response without validation or escaping. Exploitation requires a target user to follow the redirect; the demonstrated consequence is navigation to an attacker-controlled domain, not server-side code execution or service interruption.

CVSS severity6.1
Medium
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Host-header injection in Compass Plus TranzWare Online 5.3.33.3 F38 and FIMI 4.2.19.4 25 allows remote attackers to redirect users. The FIMI web interface trusts an attacker-supplied HTTP Host value and copies it into the Location header of a 302 response without validation or escaping. Exploitation requires a target user to follow the redirect; the demonstrated consequence is navigation to an attacker-controlled domain, not server-side code execution or service interruption.

The record

CVE
CVE-2021-43106
Published
Feb 14, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-116
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 14, 2022CVE 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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-116Improper Encoding or Escaping of Output

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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