CVE-2023-49606Public exploitNetwork attack vector

Memory corruption via freed Connection-header value reuse

Published May 1, 2024 · Updated Nov 4, 2025

Use-after-free in Tinyproxy 1.10.0 and 1.11.1 allows remote attackers to corrupt memory via a crafted HTTP Connection header. The remove_connection_headers() function removes a header named by the Connection value from its ordered map, frees that value, and then continues parsing through the dangling pointer. Network access is sufficient when no ACL or BasicAuth restriction blocks the client; a regular build demonstrably crashes, while code execution remains unproven.

CVSS severity9.8
Critical
EPSS probability63.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Tinyproxy 1.10.0 and 1.11.1 allows remote attackers to corrupt memory via a crafted HTTP Connection header. The remove_connection_headers() function removes a header named by the Connection value from its ordered map, frees that value, and then continues parsing through the dangling pointer. Network access is sufficient when no ACL or BasicAuth restriction blocks the client; a regular build demonstrably crashes, while code execution remains unproven.

The record

CVE
CVE-2023-49606
Published
May 1, 2024
Updated
Nov 4, 2025
Vendor
Tinyproxy
Product
Tinyproxy
Classifications
CWE-416, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 1, 2024CVE 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.10.0
  2. Affected versionversion=1.11.1
  3. Affected versionversion=Tinyproxy 1.10.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Tinyproxy · Tinyproxyversion=1.10.0; version=1.11.1; version=Tinyproxy 1.10.0

Published CVSS scores

9.8Cisco TalosCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1190Exploit Public-Facing Application

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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