← Vulnerability feed

Vulnerability record · CVE-2021-33903 · published 7 October 2021

CVE-2021-33903: Lancom-systems lcos vulnerability

Lancom Systems · Lcos

In LCOS 10.40 to 10.42.0473-RU3 with SNMPv3 enabled on LANCOM devices, changing the password of the root user via the CLI does not change the password of the root user for SNMPv3 access. (However, changing the password of the root user via LANconfig does change the password of the root user for SNMPv3 access.)

8.8 CVSS 3.1 High EPSS 1.1% · top 35.5%
8.8CVSS 3.1 base score, v2 8.5
1.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

In LCOS 10.40 to 10.42.0473-RU3 with SNMPv3 enabled on LANCOM devices, changing the password of the root user via the CLI does not change the password of the root user for SNMPv3 access. (However, changing the password of the root user via LANconfig does change the password of the root user for SNMPv3 access.)

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.nmedv.de/wp-content/uploads/2021/10/NME-2021-001.txt Third Party Advisory
https://www.nmedv.de/wp-content/uploads/2021/10/NME-2021-001.txt Third Party Advisory

Track CVE-2021-33903 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

5.9CVE-2023-48795SSH Terrapin attack downgrades channel integrity in OpenSSH and many SSH implementationsThe SSH transport protocol with certain OpenSSH extensions mishandles the handshake and sequence numbers, letting a remote attacker omit packets from…EPSS 94%analysed5.4CVE-2020-23055Lancom-systems lcos cross-site scripting vulnerabilityANCOM WLAN Controller (Wireless Series & Hotspot) WLC-1000 & WLC-4006 was discovered to contain multiple cross-site scripting (XSS) vulnerabilities i…EPSS 0.57%

Source: NIST National Vulnerability Database (record CVE-2021-33903), CISA KEV, FIRST EPSS (scores of 2026-10-02). This page is refreshed as NVD updates the record.