CVE-2025-46806

Misaligned Memory Accesses in `is_openvpn_protocol()`

6.9 MediumFix available

A Use of Out-of-range Pointer Offset vulnerability in sslh leads to denial of service on some architectures.This issue affects sslh before 2.2.4.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: Low

Exploit likelihood

0.47%Up 0.4 points since Jun 3, 2025

What each source reports

CVE List Score used 6.9

Misaligned Memory Accesses in `is_openvpn_protocol()`

A Use of Out-of-range Pointer Offset vulnerability in sslh leads to denial of service on some architectures.This issue affects sslh before 2.2.4.

Record: CVE-2025-46806
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Weakness: CWE-823
Updated: 2026-11-02

EUVDEUVD-2025-16646 6.9

A Use of Out-of-range Pointer Offset vulnerability in sslh leads to denial of service on some architectures.This issue affects sslh before 2.2.4.

Record: EUVD-2025-16646
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-9pc8-3wwf-wg5j 6.9

A Use of Out-of-range Pointer Offset vulnerability in sslh leads to denial of service on some...

A Use of Out-of-range Pointer Offset vulnerability in sslh leads to denial of service on some architectures.This issue affects sslh before 2.2.4.

Record: GHSA-9pc8-3wwf-wg5j
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness: CWE-823
Updated: 2026-11-02

NVD 6.9

A Use of Out-of-range Pointer Offset vulnerability in sslh leads to denial of service on some architectures.This issue affects sslh before 2.2.4.

Record: CVE-2025-46806
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness: CWE-823
Updated: 2026-11-02

OSV 6.9

Misaligned Memory Accesses in `is_openvpn_protocol()`

A Use of Out-of-range Pointer Offset vulnerability in sslh leads to denial of service on some architectures.This issue affects sslh before 2.2.4.

Record: CVE-2025-46806
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Weakness: CWE-823
Updated: 2026-11-02

OSVDEBIAN-CVE-2025-46806 6.9

A Use of Out-of-range Pointer Offset vulnerability in sslh leads to denial of service on some architectures.This issue affects sslh before 2.2.4.

Record: DEBIAN-CVE-2025-46806
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Updated: 2026-11-02

OSVUBUNTU-CVE-2025-46806 6.9

A Use of Out-of-range Pointer Offset vulnerability in sslh leads to denial of service on some architectures.This issue affects sslh before 2.2.4.

Record: UBUNTU-CVE-2025-46806
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Updated: 2026-11-02

OSVMGASA-2026-0227 No score

Updated sslh packages fix security vulnerabilities

CVE-2025-46806, A Use of Out-of-range Pointer Offset vulnerability in sslh leads to denial of service on some architectures CVE-2025-46807, A Allocation of Resources Without Limits or Throttling vulnerability in sslh allows attackers to easily exhaust the file descriptors in sslh and deny legitimate users service. CVE-2025-52936, Improper Link Resolution Before File Access ('Link Following') vulnerability in yrutschle sslh

Record: MGASA-2026-0227
Updated: 2026-11-02

OSVopenSUSE-SU-2025:15194-1 No score

sslh-2.2.4-1.1 on GA media

These are all security issues fixed in the sslh-2.2.4-1.1 package on the GA media of openSUSE Tumbleweed.

Record: openSUSE-SU-2025:15194-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`sslh` Debian:13	All versions, plus listed versions 2.1.4-12.3.1-1	None known
`sslh` Debian:14	before 2.3.1-1, plus listed versions 2.1.4-1	2.3.1-1
`sslh` Mageia:9 From an advisory covering 3 CVEs	before 2.3.1-1.1.mga9	2.3.1-1.1.mga9
`sslh` Ubuntu:Pro:16.04:LTS	All versions, plus listed versions 1.17-21.17-2ubuntu0.1~esm1	None known
`sslh` Ubuntu:Pro:18.04:LTS	All versions, plus listed versions 1.18-11.18-1ubuntu0.1~esm1	None known
`sslh` Ubuntu:Pro:20.04:LTS	All versions, plus listed versions 1.18-11.20-11.20-1+deb11u1build0.20.04.1	None known
`sslh` Ubuntu:22.04:LTS	All versions, plus listed versions 1.20-11.20-1+deb11u1build0.22.04.1	None known
`sslh` Ubuntu:Pro:24.04:LTS	All versions, plus listed versions 1.20-1.11.22c-11.22c-1ubuntu0.1~esm1	None known
`sslh` Ubuntu:25.10	All versions, plus listed versions 2.1.4-1build12.1.4-1ubuntu0.25.10.1	None known
`sslh` Ubuntu:26.10	All versions, plus listed versions 2.1.4-1build2	None known
`sslh` Ubuntu:26.04:LTS	All versions, plus listed versions 2.1.4-1build12.1.4-1build22.1.4-1ubuntu0.26.04.1	None known
`sslh` openSUSE:Tumbleweed From an advisory covering 2 CVEs	before 2.2.4-1.1	2.2.4-1.1

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-46806 is a medium vulnerability (CVSS 6.9) in Https://github.com/yrutschle/sslh/releases/tag/v2.2.4 Sslh, published June 2, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.47%, the 40th percentile. Fixed in sslh 2.3.1-1.

References

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