CVE-2022-45059Network attack vector

Unauthenticated request smuggling via hop-by-hop header stripping

Published Nov 9, 2022 · Updated May 1, 2025

HTTP request smuggling in Varnish Cache 7.0.0 through 7.1.1 and 7.2.0 allows remote attackers to bypass backend host routing. The HTTP/1 parser honors attacker-named hop-by-hop tokens in the Connection header and strips critical headers, including Content-Length and Host, before forwarding the request. Unauthenticated network access to an HTTP/1 listener is sufficient; the framing mismatch supports smuggled requests, while a stripped Host header can bypass VCL host routing.

CVSS severity7.5
High
EPSS probability1.49%
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 Varnish Cache 7.0.0 through 7.1.1 and 7.2.0 allows remote attackers to bypass backend host routing. The HTTP/1 parser honors attacker-named hop-by-hop tokens in the Connection header and strips critical headers, including Content-Length and Host, before forwarding the request. Unauthenticated network access to an HTTP/1 listener is sufficient; the framing mismatch supports smuggled requests, while a stripped Host header can bypass VCL host routing.

The record

CVE
CVE-2022-45059
Published
Nov 9, 2022
Updated
May 1, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-444, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 9, 2022CVE publishedPublication date reported by the CVE source.
  2. May 1, 2025Record 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

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

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.

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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