CVE-2022-34037Public exploit

Client request failure via inverted URI bounds

Published Jul 22, 2022 · Updated Aug 3, 2024

URI parsing in Caddy 2.5.1 allows administrators to trigger a client request failure through a malformed rewrite URI. The rewrite function in modules/caddyhttp/rewrite/rewrite.go places the query start after its end and slices the invalid bounds. Reachability requires administrator-supplied configuration with a fragment before a query; the maintainer classifies the behavior as a bug because it returns an empty client reply without interrupting the server.

CVSS severity7.5
High
EPSS probability1.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

URI parsing in Caddy 2.5.1 allows administrators to trigger a client request failure through a malformed rewrite URI. The rewrite function in modules/caddyhttp/rewrite/rewrite.go places the query start after its end and slices the invalid bounds. Reachability requires administrator-supplied configuration with a fragment before a query; the maintainer classifies the behavior as a bug because it returns an empty client reply without interrupting the server.

The record

CVE
CVE-2022-34037
Published
Jul 22, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-125
Attack vector
Unavailable
Privileges
admin

Timeline

How it unfolded

  1. Jul 22, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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 vectorUnavailable in this record.
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5GitLab Advisory DatabaseCVSS: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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read

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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