CVE-2023-25076Public exploitNetwork attack vector

Remote code execution via unchecked hostname copy

Published Mar 30, 2023 · Updated Mar 5, 2025

Stack buffer overflow in SNIProxy 0.6.0-2 allows remote attackers to execute arbitrary code via crafted HTTP or TLS packets. The new_address() IPv6 parser copies a bracket-delimited source length into the 262-byte ip_buf stack buffer without checking the destination size. Exploitation requires a wildcard backend host configuration; a malicious Host or SNI value can crash the proxy or redirect execution flow.

CVSS severity9.8
Critical
EPSS probability65.75%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in SNIProxy 0.6.0-2 allows remote attackers to execute arbitrary code via crafted HTTP or TLS packets. The new_address() IPv6 parser copies a bracket-delimited source length into the 262-byte ip_buf stack buffer without checking the destination size. Exploitation requires a wildcard backend host configuration; a malicious Host or SNI value can crash the proxy or redirect execution flow.

The record

CVE
CVE-2023-25076
Published
Mar 30, 2023
Updated
Mar 5, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 30, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 5, 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

9.8Cisco TalosCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NIST NVDCVSS: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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
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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