CVE-2021-36322Network attack vector

Unauthenticated cache poisoning and redirection via Host header

Published Nov 20, 2021 · Updated Sep 17, 2024

Host header injection in Dell Networking X-Series firmware 3.0.1.8 and earlier allows remote attackers to poison shared web caches. The embedded web interface accepts an arbitrary HTTP Host value and incorporates it into cacheable responses or redirection targets without validation. No authentication is required, but a user must consume an attacker-influenced cached response or redirect for confidentiality or integrity impact.

CVSS severity6.1
Medium
EPSS probability0.86%
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 Dell Networking X-Series firmware 3.0.1.8 and earlier allows remote attackers to poison shared web caches. The embedded web interface accepts an arbitrary HTTP Host value and incorporates it into cacheable responses or redirection targets without validation. No authentication is required, but a user must consume an attacker-influenced cached response or redirect for confidentiality or integrity impact.

The record

CVE
CVE-2021-36322
Published
Nov 20, 2021
Updated
Sep 17, 2024
Vendor
Dell
Product
Dell Networking X-Series
Classifications
CWE-20, CWE-74
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 20, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=unspecified <3.0.1.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Dell · Dell Networking X-Seriesversion=unspecified <3.0.1.9

Published CVSS scores

6.1DellCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.8NIST NVDAV:N/AC:M/Au:N/C:P/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-20Improper Input Validation
CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

Public exploit references

No public exploit references are available in this record.

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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