Multiple vulnerabilities in sslh



Risk Medium
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2025-46806
CVE-2025-46807
CWE-ID CWE-823
CWE-770
CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
 sslh
Other software / Other software solutions

Vendor www.rutschle.net

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) Use of out-of-range pointer offset

EUVDB-ID: #VU111713

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 - Use of Out-of-range Pointer Offset

Exploit availability: No

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

CPE2.3 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


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.

2) Allocation of Resources Without Limits or Throttling

EUVDB-ID: #VU111714

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-2025-46807

CWE-ID: CWE-770 - Allocation of Resources Without Limits or Throttling

Exploit availability: No

Description

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

The vulnerability exists due to a file descriptor exhaustion in sslh-select.c and sslh-ev.c. A remote attacker can send specially crafted UDP packets to the 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

CPE2.3 External links

https://bugzilla.suse.com/show_bug.cgi?id=CVE-2025-46807
https://github.com/yrutschle/sslh/releases/tag/v2.2.4
https://github.com/yrutschle/sslh/commit/ff8206f7c8a47f901b78a1b78db5a4c788f6aa6f


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.

3) Input validation error

EUVDB-ID: #VU111715

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: N/A

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service attack.

The vulnerability exists due to insufficient validation of undefined syslog data. A local user with ability to generate syslog events can potentially crash the application. 

Mitigation

Install updates from vendor's website.

Vulnerable software versions

sslh: 2.0 - 2.2.3

CPE2.3 External links

https://github.com/yrutschle/sslh/releases/tag/v2.2.4


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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



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