CVE-2022-38150Network attack vector

Server restart via crafted backend reason phrase

Published Aug 11, 2022 · Updated Oct 20, 2025

Denial of service in Varnish Cache 7.0.0 through 7.0.2 and 7.1.0 allows context-dependent attackers to restart the server via forged backend responses. Backend response-status handling preserves a specially formatted reason phrase until an internal assertion fails and the server process restarts. Attackers must control or influence responses from a configured backend; the resulting restart interrupts cached HTTP service.

CVSS severity7.5
High
EPSS probability1.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Varnish Cache 7.0.0 through 7.0.2 and 7.1.0 allows context-dependent attackers to restart the server via forged backend responses. Backend response-status handling preserves a specially formatted reason phrase until an internal assertion fails and the server process restarts. Attackers must control or influence responses from a configured backend; the resulting restart interrupts cached HTTP service.

The record

CVE
CVE-2022-38150
Published
Aug 11, 2022
Updated
Oct 20, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 11, 2022CVE publishedPublication date reported by the CVE source.
  2. Oct 20, 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 privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

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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