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

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.

Published: 2022-11-10 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2022-42787 is rated Moderate Risk (62/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.91%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2022-42787

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-03-10 0.58% 0.91% +0.33%
2 2025-12-29 0.91% 0.58% -0.34%
3 2025-11-21 — 0.91% —

Full EPSS history (17 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2022-42787

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]

Weakness enumeration for CVE-2022-42787

Affected software / configurations for CVE-2022-42787

Vendor Product Version Raw CPE
wut at-modem-emulator_firmware < 1.48 cpe:2.3:o:wut:at-modem-emulator_firmware:*:*:*:*:*:*:*:*
wut com-server_\+\+_firmware < 1.48 cpe:2.3:o:wut:com-server_\+\+_firmware:*:*:*:*:*:*:*:*
wut com-server_20ma_firmware < 1.48 cpe:2.3:o:wut:com-server_20ma_firmware:*:*:*:*:*:*:*:*
wut com-server_highspeed_100basefx_firmware < 1.76 cpe:2.3:o:wut:com-server_highspeed_100basefx_firmware:*:*:*:*:*:*:*:*
wut com-server_highspeed_100baselx_firmware < 1.76 cpe:2.3:o:wut:com-server_highspeed_100baselx_firmware:*:*:*:*:*:*:*:*
wut com-server_highspeed_19\"_1port_firmware < 1.76 cpe:2.3:o:wut:com-server_highspeed_19\"_1port_firmware:*:*:*:*:*:*:*:*
wut com-server_highspeed_19\"_4port_firmware < 1.76 cpe:2.3:o:wut:com-server_highspeed_19\"_4port_firmware:*:*:*:*:*:*:*:*
wut com-server_highspeed_compact_firmware < 1.76 cpe:2.3:o:wut:com-server_highspeed_compact_firmware:*:*:*:*:*:*:*:*
wut com-server_highspeed_industry_firmware < 1.76 cpe:2.3:o:wut:com-server_highspeed_industry_firmware:*:*:*:*:*:*:*:*
wut com-server_highspeed_isolated_firmware < 1.76 cpe:2.3:o:wut:com-server_highspeed_isolated_firmware:*:*:*:*:*:*:*:*
wut com-server_highspeed_oem_firmware < 1.76 cpe:2.3:o:wut:com-server_highspeed_oem_firmware:*:*:*:*:*:*:*:*
wut com-server_highspeed_office_1port_firmware < 1.76 cpe:2.3:o:wut:com-server_highspeed_office_1port_firmware:*:*:*:*:*:*:*:*
wut com-server_highspeed_office_4port_firmware < 1.76 cpe:2.3:o:wut:com-server_highspeed_office_4port_firmware:*:*:*:*:*:*:*:*
wut com-server_highspeed_poe_firmware < 1.76 cpe:2.3:o:wut:com-server_highspeed_poe_firmware:*:*:*:*:*:*:*:*
wut com-server_highspeed_lc_firmware < 1.48 cpe:2.3:o:wut:com-server_highspeed_lc_firmware:*:*:*:*:*:*:*:*
wut com-server_highspeed_ul_firmware < 1.48 cpe:2.3:o:wut:com-server_highspeed_ul_firmware:*:*:*:*:*:*:*:*
wut com-server_highspeed_poe_3x_isolated_firmware < 1.48 cpe:2.3:o:wut:com-server_highspeed_poe_3x_isolated_firmware:*:*:*:*:*:*:*:*

References for CVE-2022-42787

cvelogic Threat Intelligence