CVE-2022-42787 — Multiple W&T products of the Comserver Series use a small number space for alloc

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 t

01What is this vulnerability?

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.

02Affected products

Vendor	Product	Versions
Wiesemann & Theis	Com	Server LC — 1.0
Wiesemann & Theis	Com	Server PoE 3 x Isolated — 1.0
Wiesemann & Theis	Com	Server 20mA — 1.0
Wiesemann & Theis	Com	Server ++ — 1.0
Wiesemann & Theis	AT	Modem-Emulator — 1.0
Wiesemann & Theis	Com	Server UL — 1.0
Wiesemann & Theis	Com	Server Highspeed 100BaseFX — 1.0
Wiesemann & Theis	Com	Server Highspeed 100BaseLX — 1.0
Wiesemann & Theis	Com	Server Highspeed Office 1 Port — 1.0
Wiesemann & Theis	Com	Server Highspeed Office 4 Port — 1.0
Wiesemann & Theis	Com	Server Highspeed Industry — 1.0
Wiesemann & Theis	Com	Server Highspeed OEM — 1.0
Wiesemann & Theis	Com	Server Highspeed Compact — 1.0
Wiesemann & Theis	Com	Server Highspeed Isolated — 1.0
Wiesemann & Theis	Com	Server Highspeed 19" 1Port — 1.0
Wiesemann & Theis	Com	Server Highspeed 19" 4Port — 1.0
Wiesemann & Theis	Com	Server Highspeed PoE — 1.0

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2022-11-10T11:06:20.856Z
• Last modified: 2025-05-01T19:01:20.740Z

09References

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