CVE-2025-46807Public exploitNetwork attack vector

Remote service crash via UDP descriptor exhaustion

Published Jun 2, 2025 · Updated Jun 2, 2025

Resource exhaustion in Yves Rutschle sslh before 2.2.4 allows remote attackers to crash the daemon through many UDP sessions. The sslh-select event loop leaves UDP session descriptors open until later network activity, then dereferences a null new_cnx pointer when descriptor allocation fails. A remotely reachable UDP listener using the select or libev model is required; exhaustion blocks legitimate connections and crashes the daemon.

CVSS severity8.7
High
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Yves Rutschle sslh before 2.2.4 allows remote attackers to crash the daemon through many UDP sessions. The sslh-select event loop leaves UDP session descriptors open until later network activity, then dereferences a null new_cnx pointer when descriptor allocation fails. A remotely reachable UDP listener using the select or libev model is required; exhaustion blocks legitimate connections and crashes the daemon.

The record

CVE
CVE-2025-46807
Published
Jun 2, 2025
Updated
Jun 2, 2025
Vendor
Yves Rutschle
Product
sslh
Classifications
CWE-770, 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

8.7SUSECVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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-770Allocation of Resources Without Limits or Throttling
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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