CVE-2022-40468Public exploitNetwork attack vector

Heap-data disclosure via uninitialized request buffers

Published Sep 19, 2022 · Updated Nov 4, 2025

Information disclosure in Tinyproxy through 1.11.1 allows remote attackers to read residual heap data via malformed HTTP requests. The process_request() function passes method, URL, and protocol buffers to sscanf() without first zeroing them, leaving stale bytes available to error rendering. Exposure requires a custom error-page template with special non-standard variables; a malformed request can then return server-memory contents in the generated page.

CVSS severity7.5
High
EPSS probability1.87%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Tinyproxy through 1.11.1 allows remote attackers to read residual heap data via malformed HTTP requests. The process_request() function passes method, URL, and protocol buffers to sscanf() without first zeroing them, leaving stale bytes available to error rendering. Exposure requires a custom error-page template with special non-standard variables; a malformed request can then return server-memory contents in the generated page.

The record

CVE
CVE-2022-40468
Published
Sep 19, 2022
Updated
Nov 4, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-1188, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 19, 2022CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 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

7.5UbuntuCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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-1188Insecure Default Initialization of Resource
T1005Data from Local System

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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