81.91.84.153 — 3 open ports, 31 known CVEs, network Web4U s.r.o.

Known CVEs on this host

3open ports

0names pointing here

31known CVEs

1known exploited

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

CVEs by severity: CRITICAL 1 HIGH 10 MEDIUM 13 LOW 7

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: 1 fixed by the distribution (openssh 8.4p1). See them

Earlier software versions of this host and the CVEs they had are kept as its history. See the history

Network: Web4U s.r.o. AS39790
Open ports: 22, 80, 443 · at our latest check, 2026-05-24
Location: Czechia CZ
Hostname: m197-lb.server4u.cz · reverse DNS, checked 2026-10-04
Route: 81.91.80.0/21 · announced by Web4U s.r.o. AS39790 RPKI valid
Organisation: Web4U s.r.o. · Content / hosting
Registry network: WEB4U-NET-CUST-84 · 81.91.84.0 - 81.91.84.255 · Web4U s.r.o. · RIPE
Abuse contact: [email protected] · for WEB4U-NET-CUST-84
First seen: 2026-05-24 02:32 UTC
Last seen alive: 2026-05-24 02:33 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 (3)

22/tcp SSH OpenSSH_8.4p1 25 CVEs first 2026-05-24 · last 2026-05-24

Server: SSH-2.0-OpenSSH_8.4p1 Debian-5
Host key: ssh-ed25519 545b55c0cf595cf1…

Raw response

SSH-2.0-OpenSSH_8.4p1 Debian-5

80/tcp HTTP nginx/1.18.0 6 CVEs first 2026-05-24 · last 2026-05-24

Status: 200 OK
Server: nginx/1.18.0

Raw response

HTTP/1.1 200 OK
Server: nginx/1.18.0
Date: Sun, 24 May 2026 02:32:30 GMT
Content-Type: text/html
Content-Length: 10
Last-Modified: Mon, 23 May 2022 22:24:24 GMT
Connection: keep-alive
ETag: "628c0998-a"
Accept-Ranges: bytes

lb.WA.cz

443/tcp TLS first 2026-05-24 · last 2026-05-24

TLS: TLSv1.2
Certificate for: m197-lb.server4u.cz
Issued by: R12
Valid: 2026-05-10 → 2026-08-08

Raw response

HTTP/1.1 400 Bad Request
Server: nginx/1.18.0
Date: Sun, 24 May 2026 02:32:30 GMT
Content-Type: text/html
Content-Length: 657
Connection: close

<html>
<head><title>400 The plain HTTP request was sent to HTTPS port</title></head>
<body>
<center><h1>400 Bad Request</h1></center>
<center>The plain HTTP request was sent to HTTPS port</center>
<hr><center>nginx/1.18.0</center>
</body>
</html>
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Vulnerabilities

Fixed by the distribution (1)

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: HIGH 1

CVE	Software
CVE-2021-28041 HIGH 7.1	openssh 8.4p1 · port 22

CVE history

Software versions this host showed earlier, when we saw each, why it no longer applies, and the CVEs matched on it then. None of them is counted.

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.

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