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Fencer Intel
high 8.8

CVE-2022-42787 json

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

published 3y ago modified 4mo ago also EUVD-2022-45850

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 59%
public exploits
0
none known

Summary

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.

Patch / fix

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

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
last yr.

Exploit prediction

0.89% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

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

Classification

Weakness
  • CWE-330 Use of Insufficiently Random Values

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.