CVE-2025-46806Public exploitNetwork attack vector

Remote service crash via misaligned OpenVPN probe access

Published Jun 2, 2025 · Updated Jun 2, 2025

Out-of-range pointer access in Yves Rutschle sslh before 2.2.4 allows remote attackers to crash the daemon with crafted UDP data. The UDP path in is_openvpn_protocol() casts an offset within the heap-backed network buffer to uint32_t* and dereferences it without alignment safety. The crash occurs on strict-alignment architectures such as ARM when the OpenVPN probe is enabled, interrupting multiplexed services.

CVSS severity6.9
Medium
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-range pointer access in Yves Rutschle sslh before 2.2.4 allows remote attackers to crash the daemon with crafted UDP data. The UDP path in is_openvpn_protocol() casts an offset within the heap-backed network buffer to uint32_t* and dereferences it without alignment safety. The crash occurs on strict-alignment architectures such as ARM when the OpenVPN probe is enabled, interrupting multiplexed services.

The record

CVE
CVE-2025-46806
Published
Jun 2, 2025
Updated
Jun 2, 2025
Vendor
Yves Rutschle
Product
sslh
Classifications
CWE-823, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 2, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 2, 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=? <2.2.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Yves Rutschle · sslhversion=? <2.2.4

Published CVSS scores

6.9SUSECVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA: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-823Use of Out-of-range Pointer Offset
T1499.004Application or System Exploitation Flaws

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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