OSN

Host

81.91.92.23

As of our latest check on 2026-05-24, 81.91.92.23 (Web4U s.r.o., AS39790, Czechia) had 2 open ports (22, 80) and 19 known CVEs, 1 known to be exploited.

Known CVEs on this host

2open ports
0names pointing here
19known CVEs
1known exploited

Open ports and CVEs as of our latest check of this host, 2026-05-24.

CVEs by severity: HIGH 5 MEDIUM 9 LOW 5

A match is an indication, not proof: it is based on the software version a service reported, and fixes are often backported without changing the version. See the list

Not counted: 8 fixed by the distribution (openssh 9.2p1). See them

Network
Web4U s.r.o. AS39790
Open ports
22, 80 · at our latest check, 2026-05-24
Location
Czechia CZ
Hostname
vs1222.server4u.cz · reverse DNS, checked 2026-10-04
Route
81.91.88.0/21 · announced by Web4U s.r.o. AS39790 RPKI valid
Organisation
Web4U s.r.o. · Content / hosting
Registry network
WEB4U-NET-CUST-92 · 81.91.92.0 - 81.91.92.255 · RIPE
Abuse contact
[email protected] · for WEB4U-NET-CUST-92
First seen
2026-05-24 02:32 UTC
Last seen alive
2026-05-24 02:32 UTC
Hosted domains
No host name points here

Reputation

Not a Tor relay, not a VPN or privacy relay address, and not on a current public blocklist.

Services (2)

22/tcp SSH OpenSSH_9.2p1 17 CVEs first 2026-05-24 · last 2026-05-24
Server
SSH-2.0-OpenSSH_9.2p1 Debian-2+deb12u7
Host key
ssh-ed25519 b20bc5a51fb58dce…
Raw response 
SSH-2.0-OpenSSH_9.2p1 Debian-2+deb12u7
80/tcp HTTP nginx/1.22.1 2 CVEs first 2026-05-24 · last 2026-05-24
Status
200 OK
Title
Welcome to nginx!
Server
nginx/1.22.1
Raw response 
HTTP/1.1 200 OK
Server: nginx/1.22.1
Date: Sun, 24 May 2026 02:32:13 GMT
Content-Type: text/html
Last-Modified: Tue, 03 Feb 2026 16:16:11 GMT
Transfer-Encoding: chunked
Connection: keep-alive
ETag: W/"69821f4b-267"
Content-Encoding: gzip

18d
�uRMo�0��W�='цbG30t+�S{6��X�%D%73����q�SwғH>�G��|}�?�|����*�vZ�U_�?(t9�i�����k@�RgIPK��.����9��@���`�O{����Βr����>Q�CD�>N5�U�S��}�8��7���b��=�
Le[�}���*�h�j^-F>��[^����<A!1�|���� ��(A~!���먔~
a�J��&�ΙO>
;x�X�YF�z?L����3��<��=�ji��r
>��M�R]��Pz�c�
c ,$ս�֬����[W��h}Y�.��o�+6۝9�n�}�����])E��xX�C)��R
^)ߤ���a:]�׋����uj�P��F�nA���g���g
0

Vulnerabilities

Fixed by the distribution (8)

The distribution's security data says the package revision this service shows already has the fix for these CVEs, or that its build is not affected. They are not counted.

CVEs by severity: CRITICAL 2 HIGH 1 MEDIUM 4 LOW 1

CVESoftware
CVE-2023-28531 CRITICAL 9.8 openssh 9.2p1 · port 22
CVE-2023-38408 CRITICAL 9.8 openssh 9.2p1 · port 22
CVE-2024-6387 HIGH 8.1 openssh 9.2p1 · port 22
CVE-2025-26465 MEDIUM 6.8 openssh 9.2p1 · port 22
CVE-2023-51385 MEDIUM 6.5 openssh 9.2p1 · port 22
CVE-2023-48795 MEDIUM 5.9 openssh 9.2p1 · port 22
CVE-2023-51384 MEDIUM 5.5 openssh 9.2p1 · port 22
CVE-2025-32728 LOW 3.8 openssh 9.2p1 · port 22

Port history

Every port that has answered a connection on this address, and when. A port is listed as open above only when a service was identified on it. Times are UTC.

Report an issue with this page