#VU111713 Use of out-of-range pointer offset in sslh - CVE-2025-46806

Vulnerability identifier: #VU111713

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-46806

CWE-ID: CWE-823

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
sslh
Other software / Other software solutions

Vendor: www.rutschle.net

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to memory handling in is_openvpn_protocol() function in probe.c. A remote attacker can send specially crafted UDP packets to the affected server and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

sslh: 2.0 - 2.2.3

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External links
https://bugzilla.suse.com/show_bug.cgi?id=CVE-2025-46806
https://github.com/yrutschle/sslh/releases/tag/v2.2.4
https://github.com/yrutschle/sslh/commit/204305a88fb32cffaf1349253a2b052186ca8d39

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.